218 



CnELYOTD^. 



Neural plates present, four in number ; nuchal shield present, 

 marginal. Plastron large, with very strong axillary, and mode- 

 rately strong inguinal buttresses, the latter anchyloscd to the fifth 

 cos^^al plate. A very slender parieto-squamosal arch ; parietals not 

 expanded superiorly ; jaws moderately strong, without alveolar ridges. 

 Chin with a pair of dermal appendages. Digits entirely webbed. 



South America. 



Fig. 58. 



Sliell of Tihlnemys nasuta. 



1. Rhinemys nasuta. 



Eniys nasuta, Sclnceigg. Prodr. p. 29 (1814). 



baibatula, Gravenh. Delic. Mus. Zool. Vratisl. p. 15 pi y 



figs. 3 & 4 (1829). ' 1 • • 



Ilydraspis bai'batula, Gray, Syn. licpf. p. 43 (1831). 



Phtemys schweiggeri, Duni. ^' Bibr. ii. p. 4.35 (1835). 



Ilydraspis nasuta, Gray, Cat. Tort. p. 40 (18-:I4). 



spixii {nnn I). ^- B.), Gray, Froc. Zool. Sac. 1852, p. 1.34. 



raniceps, Gray, Cat. Sk. Jtopf. i. p. 55, pi. xxiii., and Pron. Zool. 



Soc. 18G4, p. 1.30, and Stippl. Cat. S/i. Pcpf. i. p. 74 (1870) aitd 

 Ann. ^- May. N. II. (4) xi. p. 74, lig. (1873). ' ' 



