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 23
... but Safford ( Amer . Journ . Sci . and Arts , ser . 2 , vol . xxii . p . 236 , 1856 ) records the occurrence of specimens in which the corallites are united in single intersecting series , as in Halysites , and Billings. CLASSIFICATION .
... but Safford ( Amer . Journ . Sci . and Arts , ser . 2 , vol . xxii . p . 236 , 1856 ) records the occurrence of specimens in which the corallites are united in single intersecting series , as in Halysites , and Billings. CLASSIFICATION .
Página 39
... specimens otherwise perfectly well preserved , by even the closest external examination . Very commonly in calca- reous specimens , and sometimes in those which are silicified ( especially in those where the silica has assumed the ...
... specimens otherwise perfectly well preserved , by even the closest external examination . Very commonly in calca- reous specimens , and sometimes in those which are silicified ( especially in those where the silica has assumed the ...
Página 40
... specimens examined by means of microscopic sections . More commonly the septa can be recognised as so many ... specimen . The number of the septal ridges or spines , when developed at all , is not constant , but appears to be most ...
... specimens examined by means of microscopic sections . More commonly the septa can be recognised as so many ... specimen . The number of the septal ridges or spines , when developed at all , is not constant , but appears to be most ...
Página 41
... specimen , and it cannot be employed in the diag- nosis of species . Similarly , it is not uncommon to find that the tabulæ are so bent as to give rise to a series of marginal pits or depressions , which in some specimens are extremely ...
... specimen , and it cannot be employed in the diag- nosis of species . Similarly , it is not uncommon to find that the tabulæ are so bent as to give rise to a series of marginal pits or depressions , which in some specimens are extremely ...
Página 49
... specimens derived from different formations . Typical examples , from the Upper Silurian , are generally more or less hemispherical or discoidal , with a de- pressed or slightly convex upper surface ( fig . 14 , B ) , the cor- allum ...
... specimens derived from different formations . Typical examples , from the Upper Silurian , are generally more or less hemispherical or discoidal , with a de- pressed or slightly convex upper surface ( fig . 14 , B ) , the cor- allum ...
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