A treatise on zoology . ; , neural spine; op, opisthotic; pa, parasphenoid below themyodome ; , pleural rib ; pto, pterotic ; r, rib ; so, supraoccii)ital. Order 1. AMIOIDEI. The three sub-orders of the Holostei dirter in the structure ofthe vertebral column. In the Amioidei the notochord is sharplyconsti^icted by ?\vell-formed centra in the only living species, Amio,calm, but in the earlier, more primitive forms it appears to havepersisted to a much greater extent. The Amioidei are distinguishedby the presence of separate pleuro- and hypocentra, at all eventsin a certain region. In the
A treatise on zoology . ; , neural spine; op, opisthotic; pa, parasphenoid below themyodome ; , pleural rib ; pto, pterotic ; r, rib ; so, supraoccii)ital. Order 1. AMIOIDEI. The three sub-orders of the Holostei dirter in the structure ofthe vertebral column. In the Amioidei the notochord is sharplyconsti^icted by ?\vell-formed centra in the only living species, Amio,calm, but in the earlier, more primitive forms it appears to havepersisted to a much greater extent. The Amioidei are distinguishedby the presence of separate pleuro- and hypocentra, at all eventsin a certain region. In the Actinopterygii we have hitherto A MI OWE I dealt with, the vertebral centia, formed in the skeletogenous layerin connection with the bases of the neural and haemal arches,are derived almost equally from the dorsal and the ventralelements ; with the help of bony tissue these are bound togetherinto a single ring-like or biconcave centrum. Now in Ainia well-developed bony centra occur along the trunk region, each bearing.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
