30 CHELONIA. 



Chelone girundica, Delfortrie 1 . 



Equal in size to the existing forms, with which it agrees in the 

 structure of the carapace ; the costals extending a long distance 

 onto the slender ribs. Neural bones long and narrow, with the 

 antero-lateral surfaces much shorter than the postero-lateral. The 

 epiplastrals figured by the founder of the species approach nearer to 

 those of C. imbricata than to C. my das ; and these bones, together 

 with the imperfect ossification of the shell in mature individuals, 

 indicate that the species belongs to Chelone rather than Thalasso- 

 chelys. 



The species attained dimensions fully equal to those of C. mydas, 

 but the skull is unknown and the carapace known by detached 

 bones. 



Hab. Europe (Erance). 



32351. The fifth right costal bone and rib of an immature indi- 

 vidual ; from the Middle Miocene of Bordeaux (Gironde), 

 Erance. This specimen accords in all characters with the 

 detached type costals from the same deposits figured by 

 Delfortrie in the ' Act. Soc. Linn. Bordeaux,' vol. xxvii. 

 pi. xxi. et seq. Hastings Collection. Purchased, 1855. 



Chelone (?), sp. 



There is at present no evidence to show whether the undermen- 

 tioned specimens belong to the present or one of the allied genera. 

 Hab. Europe (England). 



30410 d. The imperfect left scapulo-precoracoid of a medium-sized 

 Turtle ; from the Upper Eocene (Lower Oligocene) of 

 Hordwell, Hants. Hastings Collection. Purchased, 1855. 



Chelone hoffmanni, Gray \ 



Syn. Chelone camperi, Owen 3 . 



Allopleuron hoffmanni, Baur 4 . 



The type of Allopleuron. 



Of very large size. Skull approximating to that of C. imbricata, 

 but with a shorter aud wider palate and a wider mandible, iu which 

 the symphysis is shorter and flatter and has no distinct prominence 



1 Act. Soc. Linn. Bordeaux, vol. xxvii. p. 400 (1869). — Chelonia. 



2 Synopsis Eeptilium, p. 54 (1831). — Chelonia. 



8 Cretaceous Eeptilia (Mon. Pal. Soc), pt. i. p. 9 (1851). 

 4 Science, vol. xi. p. 144 (1888). 



