176 



CHELONIA. 



Rhinochelys pulchriceps (Owen J ). 

 Syn. Chelone pulchriceps, Owen 2 . 



The type species. Skull depressed, with very prognathous muzzle, 

 and a long interval between tympanic ring and extremity of pre- 

 maxillse ; palatal ridges very prominent ; prefrontals excluded from 

 nares, which are of medium dimensions ; nasals of moderate size. 



Hab. Europe (England). 



R. 1502. Cast of the imperfect cranium. The original, which was 

 obtained from the Cambridge Greensand, and is in the 

 collection of T. Jesson, Esq., of Northampton, is figured 

 by the writer in the ' Quart. Journ. Geol. Soc.' vol. xlv. 

 pi. viii. figs. 1, 1 a. This specimen, although somewhat 

 flattened by pressure, agrees closely with the somewhat 

 larger type cranium figured by Owen in his ' Cretaceous 

 Reptilia ' (Mon. Pal. Soc), pt. i. pi. vii. a. figs. 1-3, show- 

 ing the same depressed form, with the prognathous muzzle 

 and the very prominent palatal ridges. 



Made in the Museum, 1889. 



Rhinochelys cantabrigiensis, Lydekker 3 . 

 Skull more vaulted than in R. pulchriceps, with a much less 



Fig. 42. 



-p.fr. 



Rhinochelys cantabrigiensis. — Frontal aspect of the cranium, imperfect poste- 

 riorly ; from the Cambridge Greensand. .} . pm.x, premaxilla ; mx, 

 maxilla ; na, nasal ; p.fr, prefrontal ; fr, frontal ; pt.fr, postfrontal ; pa, 

 parietal. 



1 Rep. Brit. Assoc, for 1841, p. 172 (1842).— Chclonc. 

 3 Quart. Journ. Geol. Soc. vol. xlv. p. 230 (1880). 



Loc. cit. 



