CLASS REPTILIA. 



Expanded Chelys. Ch. {Hydrapsis) Expansa, Gray. Emys 

 ExpansQy Schw. E. Amazonica^ Spix, t. 1. E. Tracaxa. 

 [ Spix, t. 5, f. 1. 2. 



Shell ovate, depressed, brown, black spotted ; mprgin very 

 much expanded ; nuchal shield none ; nose longitudinally 

 grooved, Var. /S Emys Erythrocephala, Spix, t. 7, is perhaps 

 the same. It is from a stuffed specimen. Brazils. 



DumeriCs Chelys. Ch. (Hydraspis) Dumerilliana, Gray. 

 Emys Icterocephala, Spix, t. 4. 



Shell ovate, black, discal shields flat, hinder margin 

 expanded ; bead globose ; nose convex, smooth. Brazils. 



Cayenne Chelys. Ch. (^Hydraspis) Cayennensis, Gray, 

 Emys Cayennefisis, Schw. 



Shell ovate, convex, tuberculately keeled ; smooth, yellow 

 green, black varied ; nuchal shield none ; head brown, with 

 two yellow spots. $ Emys Gibba, Schw. Shell black. Guiana. 



Demerara Chelys. Ch. (Hydraspis) Lata, Bell MSS. 



Shell suborbicular, depressed, black ; head and neck black 

 orange spotted. Demerara. Bell. 



Consult also, 1, EmysBitentaculata, Cuv. MSS. — 2, Emys 

 Barbatula, Gravenhorst, Delic. t. 5. f. 3. 4.-3. Emys Con- 

 striata, Cuv. MSS. — 4. E. Maximiliana, Michan, and — 5, 

 Hydraspis Pachyura, Boie MSS. 



IV. The beak very broad, depressed, covered with soft lips ; 

 the nostrils long, tubular ; intergular plate marginal ; 

 Chelys, Dumeril. 



Brazilian Matamata. Chelys Matamata, Test. Matamata, 

 Brong. Jour. H. N. 7> t. 13. Ch. Fimbriata, Schn. 



Shell oblong ; shields elevated acute, forming three keels. 

 South America. 



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