182 CHELONIA. 



agreeing in size with the preceding specimen, but rela- 

 tively narrower ; from the Cambridge Greensand. 



Purchased, 1859. 



46373. The imperfect symphysis of a more flattened mandible ; from 



the Cambridge Greensand. The oral ridge is exhibited. 

 Cunnington Collection. Purchased, 1875. 



35183. The imperfect symphysis of a very similar mandible; from 



the Cambridge Greensand. The oral ridge is extremely 

 prominent. Purchased, 1859. 



35184. The symphysis of a mandible, with the oral surface ob- 



scured by phosphate ; from the Cambridge Greensand. 



Purchased, 1859. 



35185 a. The symphysis of a mandible ; from the Cambridge Green- 

 sand. The oral ridge is indistinct. Purchased, 1859. 



46374. The symphysis of a mandible ; from the Cambridge Green- 



sand. The oral surface, which is to a great extent ob- 

 scured by matrix, is characterized by its deep channelling. 



Cunnington Collection. 



30257. The symphysis of a mandible ; from the Cambridge Green- 

 sand. This specimen is of a flattened type. 



Purchased, 1855. 



30257 a. The symphysis of a mandible with the oral surface covered 

 with phosphate ; from the Cambridge Greensand. This 

 specimen is of the deep type of No. 35191. 



Purchased, 1855. 



47210. The anterior extremity of a mandible, in matrix ; from the 

 Gault of Folkestone, Kent, The ventral surface is exhi- 

 bited. Gardner Collection. Purchased, 1870. 



(Trachydermochelys phlyclcenus, Seeley V) 



The following fragments of shell belong to the Chelonian to 

 which the above name lias been applied. The carapace is charac- 

 terized by the pustular sculpture of the outer surface, and by 

 the expansion of its posterior border. There is at present no 

 evidence to show why this type of shell should not be referred to 

 Ultinochclys 2 . 



1 Index to Avcs cvo. in Cambridge Museum, pp. xix. 33 (18G9). 



2 See Quart. Journ. Geul. Soc. vol. xlv. p. 22'.). 



