464 ■ CHELONIA. 



^YTH. —Emydidae, Bell, in Zool. Journ. II, 1825, 302 ; &, III, 1828, 514.— -Gray, in 

 Ann. of Philos. X, 1825, 210 ; Catal. Tort. Grocod. & Amphisb. Brit. Mus. 1844, 13 j 

 &, Catal. Shield. Rept. Brit. Mus. I, 1855, 14. 



Emydoidea, EiTZ. Neue Class. Rept. 1826, 6. 



Emydae, Gray, Synops. Rept. in Griff. Anim. Kingd. IX, 1831, 17; &, Proc. Zool. 

 Soc. Lond. 1847, 55.— Wiegm. Handb. Zool. 1882, 166.— Fitz. Syst. Rept. i, 1843, 29. 



Emydoidae, Agass. Contr. Nat. Hist. U. S. Amer. I, 1857, 351. 



Observ. — The characters of this family, as given above, are chiefly 

 derived from Agassiz's " Contributions to the Natural History of the 

 United States of America." We do not vouch their accuracy, since 

 we have no collection of turtles at our command at the present time, 

 and thus unable to make any comparative study of the various families 

 and subfamilies, which he has recently adopted and partly established 

 for the first time in the work just referred to. 



Subfam. CLEMMYBIDAE. 



The species of this group are generally speaking of small size, their 

 body being very much arched though elongated, and their plastron 

 immovable. The limbs being rather compact, subequal, and the toes 

 but slightly webbed. In habits rather less aquatic than those of the 

 other subfamilies. 



SYN.— CIemmydoidaej Agass. Contr. Nat. Hist. IT. S. Amer. I, 1857, 356 & 442. 



Observ. — This is one of the five subfamilies into which the family 

 of Emydidae is subdivided by Prof Agassiz. The character of the 

 arched body appears to us quite negative, for, in one of the specimens 

 now before us, the carapax is very much depressed, compared to its 

 length and width. 



Gentts ACTIN:EMYS, Agass. 



Gen. Char.— Skin of the head smooth, scaleless; on the chin and occi- 

 put rumpled; on the neck and throat coarsely granular or tubercular 

 in the young, whilst granules or scale-like tubercles are observed in 



