A Treatise On Zoology volume 3
A Treatise On Zoology volume 3
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This family was richer in species than any other of the Silurian ; while the main structure was fixed, the ornament varied greatly. FAMILY 6. DOLATOCRINIDAE. Melocrinoidea with large base, flattened or concave, 3 BB, nearly always fused ; in each half-ray, 1-4 IIBr, and sometimes IIIBr and IVBr ; free arms biserial, and may fork ; 'Br, 3 or more ranges ; illBr usually present, merging with illAnib ; an Additional iBr exceptionally present in post. IR ; tegmen, when known, solid, with large plat...es ; stem round and large. All Devonian of N. America. Genera Dolatocrinus, Lyon (1857 ; W. & Sp. , 1897 ; syn. Cacabocrinus, Hall), has 2 IBr, a stout almost central anal tube, respiratory (?) slits in interbrachial areas at junction of cup with tegmen (Fig. XLV. 1), and plates usually with axial folds. Stereocrinus, Barris (1878, W. & Sp. , 1897), has 1 IBr, and BB unfused. Hadrocrinus, Lyon (1869 ; W. & Sp. , 1897 ; syn. [?] Coronocrinus, Hall), has 1 IBr and large iBr variable in number and arrangement ; very large, and imperfectly known.
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To quickly assess the difficulty of the text, read a short excerpt:
This family was richer in species than any other of the Silurian ; while the main structure was fixed, the ornament varied greatly. FAMILY 6. DOLATOCRINIDAE. Melocrinoidea with large base, flattened or concave, 3 BB, nearly always fused ; in each half-ray, 1-4 IIBr, and sometimes IIIBr and IVBr ; free arms biserial, and may fork ; 'Br, 3 or more ranges ; illBr usually present, merging with illAnib ; an Additional iBr exceptionally present in post. IR ; tegmen, when known, solid, with large plat...es ; stem round and large. All Devonian of N. America. Genera Dolatocrinus, Lyon (1857 ; W. & Sp. , 1897 ; syn. Cacabocrinus, Hall), has 2 IBr, a stout almost central anal tube, respiratory (?) slits in interbrachial areas at junction of cup with tegmen (Fig. XLV. 1), and plates usually with axial folds. Stereocrinus, Barris (1878, W. & Sp. , 1897), has 1 IBr, and BB unfused. Hadrocrinus, Lyon (1869 ; W. & Sp. , 1897 ; syn. [?] Coronocrinus, Hall), has 1 IBr and large iBr variable in number and arrangement ; very large, and imperfectly known.
What to read after A Treatise On Zoology volume 3?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
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