42 HYDRASPIS. 



Emys expansa, Schw. (v. t. Mus. Par.) Fmys Amazonica, 

 Spix, t. 1. Emys tracaxa, Spix, t. 5, f. 1, 2, (3?) 



Jun. E. Amazonica, Spix, t. 2, f. 1, 2, and f. 3. 



/3. erythrocephala. Capite supra flavescente subtus fusco 

 macula flava notato, sterno postice rotundato excavate, gula 

 non cirrhosa. Emys erythrocephala, Spix, t. 7. 



Hab. in Brasilia, (v. t. Mus. Par.) 



Spix figures the egg of Emys Amazonica, t. 2, f. 3, as 

 quite orbicular, and that of E. tracaxa, t. 5, f. 3, as oblong. 

 Kaup greatly doubts the latter eggs belonging to the species. 

 They appear more like the eggs of a land tortoise. Length 

 of shell 2 feet 7 inches, breadth 1 foot 1\ inches. 



10. Hydraspis Dumeriliana, [Dumeril' s Hydraspis.) Testa 

 ovata leviter convexa nigra, scutellis disci planis, margina- 

 libus posterioribus horizontaliter explanatis ; capite globoso, 

 naso convexo Isevissimo. 



Emys Dumeriliana, Schw. (v. t. Mus. Par.) Emys ma- 

 crocephala, Spix. t. 4. 



Habit, in Brasilia, (v. t. Mus. Par.) 

 Length of shell, 18 ; breadth, 14 inches. 



11. Hydraspis Cayennensis, {Cayenne Hydraspis.) Testa 

 ovata convexa tuberculato carinata, scutellis levibus flavo" 

 viridibus angulis posticis nigris, nuchali nuUo, capite fusco, 

 vertice luteo trimaculato, cauda brevissima. 



Emys Cayemjensis, Schw. (v. t. Mus. Par.) 

 |3 Gibba. Testa nigra, antice planata, postice tuber- 

 culato carinata. Emys gibba, Schw. (v. t. Mus. Par.) 

 Habit, in Guiana Gallica. j3. ? 



The American Hydraspides require further examination 

 with better series of specimens than I have been able to see. 

 Spix's figures and descriptions, which do not always agree, 

 leave much to be desired. They must mostly have been made 

 from badly preserved specimens. Besides the above may be 

 noted the following, several of which will probably prove 

 synonymous with the foregoing. 



Hydraspis bitentaculata. Emys bitentaculata, Cuv. Mss. 

 (v. t. Mus. Par.) Testa rufa. subtus pallide lutea nigro macu- 

 lata, scutello nuchali nuUo. 



Hab, in Brasilia. 



