PELONEOTTSIDJG. 



173 



37209. The imperfect shell of an immature individual ; from the 

 (Fig.) London Clay (Lower Eocene) of the Isle of Sheppey. 

 Figured by Bell in the ' Reptilia of the London Clay, &c.' 

 vol. i. pi. xxii., as Emys Icevis, of which it is the type. 

 The relatively greater width of the vertebral shields as 

 compared with the type specimen is merely due to the im- 

 maturity of the specimen. 



Bell Collection. Purchased, 1863. 



Genus DACOCHELYS, Lydekker 1 . 



Founded on the mandible, which is characterized by the presence 

 of a large triangular process on the oral surface of the symphysis, 

 and the serration of both the alveolar edge and an inner ridge. 

 The general contour of this mandible approximates to that of Podo- 

 cnemis, on which ground the genus is placed here. 



The shell which, from its large size, is provisionally referred to 

 this genus, presents the general characters of Podocnemis ; but the 

 vertebral shields have curved lateral borders, and are narrowed pos 

 teriorly, so that their contour becomes somewhat balloon-shaped. 



Dacochelys delabechei (? Bell). 



Syn. (?) Emys delabechei, Bell 2 . 

 =Emys conybeari, Owen 3 . 

 ^Podocnemis (?) delabechei, Lydekker & Boulenger *. 



, The type species. Fully equal in size to Podocnemis expansa. 

 Hab. Europe (England). 



39257. The imperfect anterior portion of the mandible ; from the 

 (Fig.) London Clay (Lower Eocene) of the Isle of Sheppey. The 

 type of the genus ; described and figured by the writer in 

 the ' Quart. Journ. Geol. Soc' vol. xlv. p. 241, fig. 6. 



Purchased, 1865, 



39449. An imperfect shell, provisionally referred to this genus; 



(Fig.) from Sheppey. Described and figured by Owen in his 

 ' Reptilia of the London Clay &c.' vol. i. pt. i. Suppl. i. 

 p. 77, pis. xxviii. a. and xxviii. b, as Emys conybeari ~ of 

 which it is the type. As noticed by Boulenger and the 



' Quart. Journ. Geol. Soc. vol. xlv. p. 241 (1889). 



2 Eeptilia of London Clay, &c. (Mon. Pal. Soc), vol. i. pt. i. p. 74 (1849). 



3 Ibid. Suppl. i. p. 77 (1858). 



i Geol. Mag. dec. iii. vol. iv. p. 275 (1887). 



