A treatise on zoology . Fig. 307. Vertebra of Osteorhachis Ucdsi, A. S. W. ; Oxford Clay, Peterborougli. A, oblique side viewfrom behind ; B, front view, , hypocentrum ; , neural arch ; nt, aperture for notocliord :pic, pleurocentruin ; r, jjarapophysis for rib. between the ventral crescents (Fig. 306, A, B, C). In Catarus thewhole length of the vertebral column contains complex Enthi/notas the ventral are much larger tlian the dorsal the structure of IJurijcorinus it would appear that the dorsalwedges represent incomplete precentra formed chiefly by the inter-d
A treatise on zoology . Fig. 307. Vertebra of Osteorhachis Ucdsi, A. S. W. ; Oxford Clay, Peterborougli. A, oblique side viewfrom behind ; B, front view, , hypocentrum ; , neural arch ; nt, aperture for notocliord :pic, pleurocentruin ; r, jjarapophysis for rib. between the ventral crescents (Fig. 306, A, B, C). In Catarus thewhole length of the vertebral column contains complex Enthi/notas the ventral are much larger tlian the dorsal the structure of IJurijcorinus it would appear that the dorsalwedges represent incomplete precentra formed chiefly by the inter-dorsals, while the ventral and generall}^ larger Avedges represent thepostcentra formed by the basiventrals. The basidorsals formtypical arches, but in these genera appear to contribute little tothe centra. Thus, some of the elements which go to make up acentrum in a typical vertebra (p. 100) seem to remain separatethroughout life in these iish. A somewhat similar but not identicalsplitting of the centrum takes place in
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
