KEINOCHELYS. 179 



where the nasal suture should be ; while we have the 

 continuation of the alveolar line of the maxilla by the 

 jugal, which is at once distinctive. There is a peculiar 

 swelling of the prefrontals on the border of the orbit 

 which seems to be characteristic of the present species. 



Made in the Museum, 1889. 



46371. A smaller but nearly entire cranium, apparently specifically 

 identical with the preceding specimen ; from the Cam- 

 bridge Greensand. The characteristic lateral expansion 

 of the prefrontals is well shown. The sutures on the 

 frontal aspect are very indistinct, and the palate is ob- 

 scured by phosphate. The articular surfaces of the qua- 

 drates are exposed, and have the non-pedunculated cha- 

 racter found in recent Pleurodirans ; the exact contour of 

 these surfaces is, however, not clearly seen. 



Cunnington Collection. Purchased, 1875. 



46371 a. A somewhat smaller cranium of similar type ; from the 

 Cambridge Greensand. The surface of the fronto-nasal 

 region is chipped away, and the squamosal is wanting. 



Cunnington Collection. 



35197. A still smaller cranium of the same type ; from the Cam- 

 bridge Greensand. The occiput and palate are coated 

 with phosphate ; the other surfaces are nearly perfect, 

 although the sutures are indistinct. Purchased, 1859. 



R. 27. An imperfect and shattered cranium, probably belonging 

 either to the present or a closely-allied species ; from the 

 Gault of Folkestone, Kent. 



Gardner Collection. Purchased, 1879. 



Rhinochelys brachyrhina, Lydekker 1 . 



This species is characterized by the extremely small size of the 

 nasals, in which the width exceeds the length, and by the very- 

 large dimensions of the nares, as well as by the circumstance that 

 the prefrontals enter largely into the formation of the nares. This 

 form should perhaps represent a distinct genus. 



Hob. Europe (England). 



R. 1504. Cast of the anterior portion of the cranium. The original, 

 which is the type, was obtained from the Cambridge 

 Greensand, and is preserved in the collection of T. Jesson, 



1 Quart. Journ. Geol. Soc. vol. xlv. p. 231 (1889). 



n2 



