Mr. Bell's Characters of the Tesludinata, 515 



admission of all the 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^e. 

 Genus. Hydraspis. 



Caput depressum, rostrum subacutum; collum elongatum, ex- 

 tensile ; sternum latum immobile ; scutum primum vertC' 

 brale 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 



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. Ccecum nullum. Vesica uri' 

 naria maxima. Membrana tympani cute communi tecta ; cochlea 

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

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

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

 solidatae. Scapulce, clamculce, et pelvis, intra testam osseam in- 

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

 testae osseae agglutinata. 



A. Digitata. 



Familia 1. TESTUDINID^. 



Terrestres. Herbivorae. Caput altum, obtusum ; Maxillm 

 corneae, serratae. Pedes squamosi, clavati ; digiti indistincti ; 

 Vol. III. 2 k 



