64 CHELOKTIA. 



Owen in his ' Wealden and Purbeck Reptilia ' (Mon. Pal. 

 Soc), pi. viii. fig. 2, under the name of Ghelone costata ; 

 the specimen being erroneously regarded as coming from 

 the Wealden, and stated to belong to the Mantell Col- 

 lection. Presented by E. Charlesworth, Esq., 1836. 



Lytoloma planimentum (Owen J ). 



Syn. (?) Chelone harvicensis, S. Woodward 2 . 

 Emys parhinsoni, Gray 3 . 

 Chelone planimentum, Owen 4 . 

 Chelone breviceps, Owen 5 (in parte). 

 Thalassochelys planimentum, Cope 6 . 

 Puppiyerus breviceps, Cope 7 (in parte)? 

 Glossochelys harvicensis, Seeley 8 . 

 Pachyrhynchus planimentum, Dollo 9 . 



The type of Glossochelys. 



Adult skull vaulted and very short and wide, with the facial 

 profile descending very suddenly between the orbits ; mandible of 

 the same type as that of the preceding species. Carapace with 

 the antero- and postero- lateral surfaces of the neurals subequal ; 

 and the ribs slender, and occupying only a small moiety of the 

 under surface of the broad costals. Coracoid 10 of adult with a 

 narrow proximal portion, and a sudden expansion near the middle. 



Assuming that the type skull and shell belonged to the same 

 individual (and this seems to have been undoubtedly the case), the 

 proportions between the two are nearly the same as in Macro- 

 clemmys in the Chelydridce, the length of the skull being more than 

 one third of that of the carapace. Even if the type skull of the 

 so-called Emys parhinsoni be rightly regarded as that of a young 

 individual of the present species, it seems unadvisable to adopt that 

 specific name, since the figure is very unsatisfactory and there is 

 no description. With regard to the carapace in the Norwich 

 Museum figured by S. Woodward in the work cited as the type of 

 Chelone harvicensis, it is probable, from the characters of the ribs, 

 that it belongs to the present form. The contour of the neurals is, 



1 Eep. Brit. Assoc, for 1841, p. 178 (1842).— Cfofowe. 



- Synoptical Table of British Organic Eemains, p. 38, plate (1830). 



3 Syn. Kept. p. 33 (1831). l Loo. cit. : ' Loc. tit. 



u Trans. Ainer. Phil. Soc. vol. adv. pt. i. p. 146 (1870). 7 Ibid. p. 235. 



8 Ann. Mag. Nat. Hist. ser. 4, vol. viii. p. 232 (1871). 



,J Bull. Mus. E. Hist. Nat. Belg. vol. iv. p. 138 (1886). 



10 Owen, Eeptilia of the London Clay, &c. vol. i. pt. i. pi. x. 



