On the Structure and Affinities of the "Tabulate Corals" of the Palaeozoic Period: With Critical Descriptions of Illustrative SpeciesWilliam Blackwood, 1879 - 342 páginas |
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Página 39
... Thin sections , however , when taken parallel with the axis of the tubes , will generally , in some part or another , coincide with the plane of the wall of a corallite , and will then exhibit the mural pores with greater or less ...
... Thin sections , however , when taken parallel with the axis of the tubes , will generally , in some part or another , coincide with the plane of the wall of a corallite , and will then exhibit the mural pores with greater or less ...
Página 49
... thin , smooth , or con- centrically - striated epitheca , which is commonly worn off in old specimens , though sometimes greatly thickened . Average examples of this kind are usually two or three inches in dia- meter , sometimes more ...
... thin , smooth , or con- centrically - striated epitheca , which is commonly worn off in old specimens , though sometimes greatly thickened . Average examples of this kind are usually two or three inches in dia- meter , sometimes more ...
Página 50
... thin sections by the thinness of their walls ( Pl . I. , figs . 1 and 2 ) . In no case do the larger calices assume the rounded character of those of F. For- besi , nor is there the same conspicuous interpolation of small tubes among ...
... thin sections by the thinness of their walls ( Pl . I. , figs . 1 and 2 ) . In no case do the larger calices assume the rounded character of those of F. For- besi , nor is there the same conspicuous interpolation of small tubes among ...
Página 53
... thin transverse sections of the corallum ( Pl . I. , fig . 2 ) . Lastly , the condition of the septa in F. Gothlandica is as variable as that of the other elements of the corallum . In most of the specimens the septa are quite obsolete ...
... thin transverse sections of the corallum ( Pl . I. , fig . 2 ) . Lastly , the condition of the septa in F. Gothlandica is as variable as that of the other elements of the corallum . In most of the specimens the septa are quite obsolete ...
Página 59
... thin transverse sections almost invariably confirm the existence of these structures ( Pl . I. , fig . 7 , and Pl . II . , fig . 1 ) . These septal spines or ridges are , however , always short , and extend but a short distance inwards ...
... thin transverse sections almost invariably confirm the existence of these structures ( Pl . I. , fig . 7 , and Pl . II . , fig . 1 ) . These septal spines or ridges are , however , always short , and extend but a short distance inwards ...
Outras edições - Ver tudo
On the Structure and Affinities of the "Tabulate Corals" of the Palaeozoic ... Henry Alleyne Nicholson Visualização integral - 1879 |
On the Structure and Affinities of the "Tabulate Corals" of the Palaeozoic ... Henry Alleyne Nicholson Visualização integral - 1879 |
On the Structure and Affinities of the "Tabulate Corals" of the Palaeozoic ... Henry Alleyne Nicholson Visualização integral - 1879 |
Palavras e frases frequentes
Actinozoa affinities Alcyonaria allied alveolata Alveolites appear Aulopora Beaumontia Billings Brit calices Carboniferous Char.-Corallum characters Chatetes Chonostegites cœnenchyma Columnaria Constellaria contiguous corallites contiguous tubes coral corallum D'Orb Devonian distinct Dr Lindström Dr Rominger Edwards and Haime Eifel enlarged five enlarged twenty epitheca Favosites Favositida Fistulipora Forbesi Foss genus Goldf Goldfuss Gothlandica Halysites Heliolites Heliolitida horizontal Hydrozoa interstitial Labechia lamellæ large corallites large tubes larger latter line in diameter longitudinal Lonsd M'Coy Michelinia microscopic Milne-Edwards and Haime Monticulipora mural pores numerous Ontario Pachypora perforated polygonal Polyzoa pora Portion present prismatic radiating recognised regarded resemblance ridges sclerenchyma sections Pl separated septa small corallites small tubes smaller species specimens spines spiniform Stenopora Syringopora tabulæ Tabulata Tabulate Corals tangential section Tetradium Thecia thickened thin sections tissue transverse section Upper Silurian upper surface vertical section visceral chamber walls Wenlock Wenlock Limestone Zoantharia