CHELONIA. 
25 
CHELONIA, 
FROM THE CAMBRIDGE UPPER GREENSAND. 
Index to the bones of Chelonians, from the Cambridge Green¬ 
sand, mounted to exemplify the Osteology of the Order. 
Exhibited in Compartments h, i, j, of Table-case J. 
The majority of the skulls belong to a new genus which 
may be called Rhinochelys, having for its type Chelone 
pulchriceps (Owen). It is Emydian in its affinities, and well 
characterized by having the nasal and pre-frontal bones dis¬ 
tinct ; by the posterior nares being formed by the maxillary 
and palatine bones, and divided by the whole length of the 
vomer which extends on the palate between the palatine 
and premaxillary bones; and by the temporal region being 
covered by an arrangement of bones like that in Chelone. 
Case. Comp. Tablet. Specimen. 
J 
h 
h 
h 
h 
h 
h 
h 
h 
1 1 worn skull of Rhinochelys. 
2 2 anterior region of skull, Rhinochelys. 
3 1 skull of Rhinochelys (type for a species). 
4 1 skull of Rhinochelys (type for a species). 
5 1 skull of Rhinochelys pulchriceps (Owen, sp.). 
6 1 skull and lower jaw of Rhinochelys (type for a 
species). 
7 1 hinder region of skull of Rhinochelys. 
8 1 left anterior region of skull of Rhinochelys. 
