134 



CHELONIA. 



Genus CHELYDRA, Schweigger \ 

 Syn. Chelydropsis, Peters 2 . 



Skull with the lateral borders of the face highly convex, and the 

 orbits directed upwards and outwards. Shell (fig. 32) with the 

 emaxgination of the nuchal not very deep ; neural bones hexagonal, 

 with short antero-lateral surfaces ; supramarginal shields absent ; 

 posterior border of carapace serrated. Skull not excessively large 

 in proportion to shell. 



Fiff. 31. 



Macroclemmys temmincki. — Dorsal aspect of the left humerus, a, entocondyle ; 

 b, ectocondyle ; d, ectepicoudyle ; e, ectepicondylar foramen ; g, head ; 

 h, radial (lateral) process ; i, ulnar (mesial) process. {After Both.) 



The name Chelydropsis was applied to a Chelydroid from the 

 Middle Miocene of Styria, said to have two nuchals ; this is, how- 



1 Prodromus Mon. Cheloniorum, p. 23 (1812). 



2 Sitz. k. Ak. Wien, vol. lvii. pt. i. p. 73 (1868). 



