. Bulletin of the British Museum (Natural History), Geology. 296 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES ing before reaching the anterior end of the bone. Here the bone is considerably thickened, with a well-marked articular surface for the hypohyal. Of the hypohyal only the dorsal half remains in 601246. However, from the size of its articulatory facet it must have been a stout bone. Vertebrae. The vertebrae of Caturus show a very primitive condition (Zittel, 1887 : 228). In this species each segment of the whole body shows two ossifications, an anterior pleurocentrum and a pos
. Bulletin of the British Museum (Natural History), Geology. 296 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES ing before reaching the anterior end of the bone. Here the bone is considerably thickened, with a well-marked articular surface for the hypohyal. Of the hypohyal only the dorsal half remains in 601246. However, from the size of its articulatory facet it must have been a stout bone. Vertebrae. The vertebrae of Caturus show a very primitive condition (Zittel, 1887 : 228). In this species each segment of the whole body shows two ossifications, an anterior pleurocentrum and a posterior hypocentrum, which together embrace Ssc. Fig. 34. Caturus chirotes (Agassiz). Internal view of right cleithrum and pectoral girdle. From 60124^. the notochordal space. The pleurocentra bear articular facets for the neural arches which are wedged between them. In the caudal region the neural arches are divided into distinct halves, there being not only a cleft neural spine as in Caturus furcatus, but a complete division through the arch. The hypocentra have pronounced para- pophyses in the trunk region for the articulation of the ribs. In the tail they bear haemal arches. Pectoral girdle. This has been extracted almost in its entirety from 60124^ (Text-fig. 34). The suprascapular is a small bone which articulates with the skull in the region of the epiotics. Passing through the suprascapular is a branch of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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