12. EMTB. 



Ill 



12. EMYS. 



Emv9, part, Dumir. Zool. Anal. p. 7G(1806) ; Men-em, Tent. p. 22 



(1820) ; Wagler, Syst. Amph. p. 138 (1830) ; Strauch, Chelon. Stud. 



p. 27 (1802). 

 Eniys, Flemimi, Phil. Zool. ii, p. 270 (1822) ; Bonap. Osserv. s. sec. 



Ed. d. Ii. A. p. 104 (1830); Ayassiz, Contr. Nat. Hist. U. S. i. 



p. 441 (1857). 

 Tfi-rapene, part., Bell, Zool. Joum. ii. p. 308 (1825). 

 Cistudo, part.. Gray, Si/n. liept. p. 17 (l8-")l) ; Dum. i§- Bib)', ii. 



p. 207 (1835) ; Gray, Cat. Tort. p. 29 (1844). 

 Lutremys, Gray, Cat. Tort. p. 31, and Cat. Sh. Rept. i. p. 40(1855), 



and Snppl. p. 22 (1870). 

 Emydoidea, Gray, Suppl. p. 19. 



Neural plates hexagonal, short-sided in front. Plastron united 

 to carapace by ligament, and more or less distinctly divided, in the 

 adult, into two lobes movable upon a ligamentous hingo between 



Fi^. 31. 



Shell of Einys orbictdaris. 



the hyo- and hyposternals, both of which bones contribute to the 

 formation of the bridge : entoplastron intersected by the humero- 



