CHELTID^J. 169 



boundaries of the epidermal shields are much less deeply marked 

 than in Chelodina. The nuchal shield may be wanting. 



(Pmptfitra maccruartae (Gray l ). 

 Syn. Hydraspis macquarii, Gray 2 . • 



The type species. Shell more or less depressed, with the posterior 

 portion expanded, and either entire or slightly serrated; a large 

 nuchal shield; outer surface marked either by rugosities or vermi- 

 cular impressions. 



Hah. South-eastern ( and [?] North- western) Australia. 



R. 1593. An imperfect eighth marginal bone of the right side, 

 belonging either to this or an allied species ; apparently 

 from the Pleistocene cave- deposits of New South Wales. 

 This specimen indicates a larger individual than any recent 

 examples in the Museum, but, in the absence of well- 

 marked specific points of distinction, is provisionally re- 

 ferred to the same species. The free portion is, however, 

 relatively narrower than in existing specimens. 



No history. 



42684. An imperfect right tenth marginal, probably referable to 

 the same species as the preceding ; from the Pleistocene 

 cave-deposits of the Wellington Valley, New South Wales. 

 This specimen appears to include part of the eighth costal. 

 Presented by the Trustees of the Australian Museum, 1870. 



Genus HYDRASPIS, Bell 3 . 



Typically neural bones six in number, of which the second and 

 third have short antero-lateral surfaces ; a nuchal shield, which is 

 marginal in position. Plastron large, with strong axillary and 

 moderate inguinal buttresses, the latter anchylosed to the fifth 

 costal ; xiphiplastrals deeply notched. 



Por other characters and synonymy see Boulenger, ' Catalogue of 

 Chelonians,' &c, pp. 219, 220. 



This genus is now confined to South America. 



1 Synopsis Eeptilium, p. 40 (1831). — Hydraspis. 2 Loc. cit. 



3 Zool. Journ. vol. iii. p. 511 (1828). 



