CCELODUS. 



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Generic Characters. — Trunk deeply fusiform, with short slender caudal pedicle. 

 Cranial roof-bones pierced by a pair of supratemporal vacuities, surrounded by the 

 supraoccipital, parietal, and frontal elements. Head and opercular bones externally 

 rugose and punctate ; two chisel-shaped teeth in each premaxilla and dentary ; 

 tritoral teeth often exhibiting an apical indent usually with crenulated border ; oral 

 surface of vomer convex from side to side, with teeth in five longitudinal series; 

 splenial dentition comprising three series of teeth with long axes more or less 

 directly transverse, sometimes supplemented within by a small row. Neural and 

 haemal arches of axial skeleton of trunk not expanding sufficiently to encircle the 



Fig. 24. — Caelodus castas, Heckel ; restoration (omitting- pterygo-quadrate arch), nearly nat. size. — 

 Lower Cretaceous ; Torre d'Orlando,Castellamare, Naples. 



notochord. Fin-rays robust, closely articulated, and much divided dis tally. Pelvic 

 fins present ; dorsal and anal fins high and acuminate in front, low and fringe-like 

 behind, the former occupying at least the hinder half of the back, and the latter 

 somewhat shorter, arising more posteriorly ; caudal fin forked, with a convexity in 

 the middle. Scales ornamented with reticulating rugae and punctations, occupying 

 only the anterior half of the trunk in advance of the median fins, and complete 

 only in the ventral region. 



Type Species. — Gceloclns saturnus (Heckel, lor. cit., 1854, p. 455, and Denkschr. 

 k. Akad. Wiss. Wien, math.-naturw. CI., vol. xi, 1856, p. 207, pis. iii, iv), known by 

 a nearly complete fish from the Lower Cretaceous of Goriansk, Istria. 



Remarks. — This is typically a Cretaceous genus and is known by several 

 complete skeletons ; but only jaws have hitherto been found in the Wealden and 



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