Mr. Bell's Characters of the Testudinata. 513 



admission of ail tlie species quoted from Spix, until I should 

 have an opportunity of examining the animals for myself, espe- 

 cially as his plates are in many cases very doubtful and con- 

 fused. 



Fam. Emydid^. 

 Genus. Hyuraspis. 



Caput depressum, rostrum subacutum ; collum elongatum, ex- 

 tensile ; sternum latum immobile ; scutum primum verte- 

 brate antice latissimum ; scuta sterni xiii. 



Art. LVII. Characters of the order, families^ and genera 

 of the Testudinata. By Thomas Bell, Esq., F.R.S.y 

 L.S., G.S., Sfc. 



Classis. REPTILIA. 



Ordo. TESTUDINATA. 



Cor auriculis binis, ventriculo unico biloculari. Pulmones 

 separati, cellulosi, abdomini intrantes. Os edentulum, rostratum; 

 maxilla inferior intra superiorem (pyxidi instar) se claudens. 

 Lingua lata. Ventriculus simplex. Ccecmn nullum. Vesica uri- 

 naria maxima. Membrana tympani cute communi tecta ; cochlea 

 nulla. Penis simplex canaliculatus. Vagina simplex. Ova plu- 

 rima testa dura induta. Vertebrce colli 8 — 9, mobiles. Vertebra; 

 dorsi 8, quae cum costis atque sterno in testam fornicatam con- 

 solidata?. Scapulce, claviculce, et pelvis, intra testam osseam in- 

 clusae. Pedes 4. Cutis dorsi sternique cornea vel coriacea, 

 testae osseae agglutinata. 



A. Digitata. 



Familia 1. TESTUDINID.E. 



Terrestres. Herbivorae. Caput altum, obtusum ; Maxillte 

 corneae, serratae. Pedes squamosi, clavati ; di giti indLisimcti; 

 Vol. hi. 2 k 



