Mountain limestone Perry county. Perhaps this fossil will form a new genus, but I am not inclined to increase the number of genera if unnecessary. Our fossil is a multilocular shell, and has several characters in common with the established genus spirula. I have described it under the name of S. Mortonii in a memoir to the Geological Society of France. I discovered it first in an earthy limestone on the western bank of the Tennessee river, Perry county, where it occurs with Trilobites, Calceola, and several other bivalve shells characterizing the transition series. I have since received some specimens from the vicinity of Columbus Ohio.

37. Hamites Verneuilii, nobis. Greene and M'Nairy counties.

Shell elongated, sub-cylindrical, transversely elliptical or circular according to the place where the section is made, it being elliptic near the extremities and almost circular about the middle at the curvature where it has its greatest diameter; having two branches of unequal length; it is surrounded with ribs, which are sometimes transversal on the short branch, sometimes oblique on the long branch; they are simple around the two extremities and bi-and even tri-forked around the middle or curvated part. These ribs, particularly on the most elevated part of the curvature, are furnished with tubercles, which are placed irregularly in the channels or upon the intermediate elevations or ribs; the greatest tubercles are on the most elevated part of the curvature, and diminish gradually towards the extremities of the branches where they disappear altogether.

I have described and figured it in a memoir for the Geological Society of France. This Hamites, which like all those that have been described, is an interior cast, was still covered, when I found it with its external shell which was very thin, and so much decomposed that when dry, it fell off altogether, and is now only covered with its interior enamel which must have possessed the most brilliant opalescent colors, which are still visible on its surface, particularly when it is moistened. The edges of the septa are not visible, so that I cannot say whether they are simple or lobed and dentated, nor have I been able to determine the position of the syphon.

The H, Verneuilii occurs of different sizes. I have a fragment of one in my collection which is about one fourth thicker than the specimen here described, and Dr David Dale Owen, has one from the same place which is twice as large.

38. Hamites Leaii, nobis. Green sand, same locality.

Shell elongated transversely irregularly elliptic, having at one of its extremities a slope, while the other extremity terminates in a projecting point. It is furnished with transversal ribs-these ribs do not run entirely round the whole shell, but disappear on the interior side where there is an excavation which is filled up by the other branch which diminishes gradually till it terminates in a point. The curvature is very abrupt and short."

As my specimen is only an internal cast, the edges of the septa are

not visible. In fact I have not been able to ascertain whether or not it had septa, and consequently I could not determine the position of the syphon.

39. Baculites. Same locality.

I am not sure whether it is described. It does not resemble those described by Mr. Morton.

40. Conularia Sowerbii, Defr. Mountain limestone near Nashville, and its siliceous stratum on Harpeth ridge.

I doubt, judging from the specimens now before me, whether this equivocal genus, (about which naturalists yet disagree whether it belongs to the Polythalamites or not,) is a shell at all. I possess besides some fragments, an entire individual, which resembles perfectly the figure given in the Dict. des. Sc. Nat. pl. xxxiv. figure 2, it being more or less combressed. Its surface nevertheless is not exactly similar to that represented in the above mentioned plate. The transversal striæ which are represented on this figure are very visible upon all the fragments, but the interstices between these striæ, exhibit an organization of very delicate fibres, by which these strim, (which are also a kind of coarser fibers,) seem to be connected and offer when magnified, such a surface as is probably not possessed by any shell. I have described and figured this fossil in a memoir to the Geol. Soc'y. of France, and having given there an exact magnified representation of this surface. I have yet to observe that all the specimens, whether calcareous or sicileous, that have come under my observation are compressed, sometimes very much. I possess a fragment of which each quarter is twenty-five milimetres, and the whole thickness of the specimen is no more than nine milimetres. Is it not singular that a shell which is furnished with transversal septa, which assist so eminently, some delicate varieties of Nautilites, to support the external pressure, should all be compressed? My doubts expressed above whether it really belongs to the molusca or founded upon the two above mentioned facts, namely its surface and it, being very uncertain whether it possesses septa in its interior.

41. Bellerophon Nashvillensis, nobis.

Mountain Limestone in Davidson county.

This shell is smooth, its mouth entire and surrounded with a thick rounded margin formed by the accumulation of the lamina which compose this shell. I found it first in a singular stratum of limestone which occurs at several places in Davidson county, which is at some places entirely made up of fragments of these shells, of Orthoceratites, Venus, and several others. These fragments are all water worn, and would induce the belief that they had been rolling a great while on a sea beach. I never found an entire shell in this stratum. This stratum replaces irregularly here and there the common mountain limestone in this county, but there is no doubt that it was of a contemporaneous formation with tht mountain limestone, because it is covered at several places by the latter.

42. Bellerophon-(perhaps seven not determined species.) Mountain Limestone, Middle Tennessee.

Most of these Bellerophons are siliceous, some of them of large size,

(about three inches.) Some occur in the superior strata of this mountain limestone group, and are then associated with Stylines, Pentremites, Syringopora and other Zoophites. Sometimes they are found in the lower strata, where they are associated with Orthoceratites, Conotubularia, Isotellus, etc.

43. Solarium Leaii, nobis..

Mountain limestone, Rock Island, in Caney Fork, Tennessee. 44. Solarium, (two not determined species.)

These two Solaria differ from each other and the preceding species. The one was found accompanied with Orthoceratites in mountain limestone in Smith county, opposite Carthage. The other in a siliceous stratum belonging to the same group, near Lagrange Iron Works, in Stuart county.

45. Euomphalus, (not determined.)

From the siliceous part of the encrinital limestone in Davidson co. 46. Euomphalus? (not determined.)

This species differs generally from the preceding; it forms perhaps an intermediate genus between Solarium and Euomphalus.

47. Maclauites magna Lesueur, Euomphalus Maclurii, Brongt. Mountain limestone and grauwacke limestone.

The superior strata of the grauwacke series between Kingsport and Rogersville, Hawkins county, East Tennessee, and particularly the stra tum of blackish grey limestone at Kingsport, contain large numbers of this shell. They are also found, though rarely, in the mountain limestone in Middle Tennessee.

48. Maclurites striata, nobis.

Grauwacke limestone-same locality.

Eesueur seems to have been acquainted only with the preceding spe cies, which has a smoth shell. The species here mentioned has its shell striated.

49. Trochus, (undetermined species.)

Mountain limestone, near Nashville.

50. Turbo bicarinatus, nobis.

Mountain limestone, Middle Tennessee.

This shell eminently characterizes some of the strata of Middle Tennessee-the rock is sometimes covered with it, and being mostly silicicieous, it is easily separated by acids from the limestone.

It is associated with Orthoceratites and Bellerophon.

51. Turbo, (perhaps six undetermined species.).

Mountain limestone, Middle Tennessee.

52. Natica, (undetermined.)

Mountain limestone, Perry county.

It is surprising to find this genus in our mountain limestone. Ir Europe, according to DeFrance, eight species have been found in a fossil state, one being identical with a living species, and is found in strata posterior to chalk. It is of rare occurrence here; I found only two spe cin, one remarkably well preserved. It resembled in figure someVatica mamella; its spire is not so much elevated as in N. ma

53. Natica, (undetermined.) Green sand, M'Nairy county, Tenn. 54. Malania?

Mountain limestone, M.ddle Tennessee.

I found these shells in Smith county. They have the generic characters of the Melania. and are associated with Conulite, Orthociratite, Bellerophon, and others.

55. Trochus, (several undetermined species.)

Mountain limestone, Middle Tennessee.

This shell resembles the figure of V. capuloide in DeBlainville's Manual (pl. 42, fig. 4.) But it has not yet been found in a fossil state. 57. Hipponyx?

Mountain limestone and encrinital limestone in several places of Middle Tennessee.

This fossil resembles in its external appearance the Hipponyx of De France, it being conoid and curvated backward, and its aperture being surrounded by an irregular border. No mark of a hinge is visible.-As the specimens in my cabinet are all filled with materials of the rock in which they were imbedded, I am not able to determine whether the peculiar impression characterizing this genus exists in the interior of the shell. I am also uncertain whether it was fixed to any support, as is the case with the Hipponyx.

58. Rostellaria macrodactila, nobis.

Green sand, near Purdy, M'Nairy county.

I call this species macrodactila, from its long finger-like projections; it is one of the finest shells that I have found in the green sand; it is partly embedded in this rock, spreading its slender extensions for about 1 inches over it.

59. Delphinula?

Green sand, same locality.

It has some resemblance with D. lapidosa, Morton.

60. Turritella inbricataria.

Green sand, same locality.

61. Dentalium, (undetermined.) Green sand, same locality.

TRILOBITES.

62. Calimene Blumenbachii, Brongt. Mountain limestone in Perry county.

It occurs in an argillaceous limestone susceptible of decomposition, accompanied with Calceola, Pentremites and other Radiata; also with some other species of Trilobites.

63. Asaphus megalopthalmus, nobis.

Siliceous stratum subordinate to the mountain limestone, same locality.

This Asaphus is very remarkable for its large projecting eyes on which the tubercles, such as are seen on the eyes of some insects and crustaceous animals, are yet visible.

64. Isotellus gigas, Dekay. Mountain limestone in Middle Tenn. While writing this report, the Rev. Mr. Howell of this place presented me with a very fine specimen of this species which I had not yet discovered in our State-he found it near Fayettville-it is not entire, its head is wanting, the abdomen is 2 3-10 inches, and the tail 29-10 inches in length.

This specimen, as much as I have of it, is in a good state of preservation and imbedded in a compact limestone of a gray color and slaty structure.

65. Isotellus planus.

Mountain limestone in Davidson county.

66. Trilobites, (several belonging to different genera.) Mountain limestone, particularly Perry county.

67. Crustacea, (not determined.)

I have in my cabinet parts of several undetermined Crustacea which differ generically from any of that class of animals hitherto described. They all occur in the mountain limestone of Perry county. Amongst my undetermined Trilobites, I have one from the vicinity of Nashville approaching the Asaphus micrarus, Green, one found in Perry county approaches the Asaphus Hausmanii, Brongt. another the A Debuchii, Brongt.

ZOOPHITES.

68. Pentremites ovalis, Gold.

It occurs in a stratum which separates the coal measures from the mouutain limestone, particularly at the base of the Cumberland mountains, where the limestone has an oolitic structure, as east of Sparta, Crab Orchard and other places.

69. Pentremites florialis, Say.

Same locality and geological position.

Whether this species is distinct from the preceding, I am not able to determine.

70. Pentremites globosa, Say. Same locality.

71. Pentremites pyriformis, Say.

Mountain limestone, near Sparta and Sequatchee valley.

72. Pentremites Reinwardtii, nobis.

Mountain limestone, Perry county, accompanied with Calceola, Calimena, Terrebatula Wilsonii, and others. (1)

73. Eugeniacrinites mespiliformis, Goldf.

Mountain limestone, Perry county.

74. Asteras antiqua, nobis.

Mountain limestone, near Harpeth river, Davidson county.

I have described this fossil in the Transactions of the Geological Society of Pennsylvania, as is mentioned already in this report. See note page 4.

I have already published two memoirs on Echinodermata in the

(1) I have written an elaborate memoir on the genus Pentremites and its geological position in Tennessee, Alabama and Kentucky. (See Transactions of the Geological Society of Pennsylvania.)