18 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



Type. — UdIoiowii. 



Type locality. — Ascension Island. 



Range. — Tropical oceans, world-wide, both coasts of Mexico. 

 Reported from Veracruz, Yucatan, Quintana Roo (Isla de Mujeres), 

 Oaxaca, Guerrero, Sonora (Tibur6n Island), and Clarion Island. 



Suborder Trionychoidea Fitzinger 



Trionychoidea Fitzinger, Neue Classification der Reptilien . . ., 1826, p. 7. 



Families. — Two, one of which (Carettochelyidae) is restricted to 

 New Guinea. 



Family TRIONYCHIDAE Gray 



Trionicidae Gray, Ann. Philos., ser. 2, vol. 10, 1825, p. 212. 



Genera. — Seven, only one of which occurs in the Americas. 

 Range. — Asia, Africa, North America. 



Genus AMYDA Schweigger 



.i4m?/da8cHWEiGGER, in Geoflfroy, Ann. Mus. Hist. Nat. Paris, vol. 14, 1809, p. 1. — 

 CoNANT and Goin, Occ. Pap. Mus. Zool. Univ. Michigan, No. 510, 1948, pp. 

 11-19 (taxonomy). 



Genotype. — Amy da javanica Geoff roy [=Amyda cartilaginea (Bod- 

 daert)]. 



Species. — About 21, of which 4 are American; two or three sub- 

 species are recognized of one species (A. spinifera). One occurs in 

 Mexico. ^° 



Range. — Asia, North America. 



AMYDA EMORYI (Agassiz) 



Aspidonecles emoryi Agassiz, Contributions to the natural history of the United 

 States, vol. 1, 1857, p. 407; vol. 2, 1857, pi. 6, figs. 4, 5. 



Amyda emoryi, Stejnegbr and Barbour, Check list of North American amphib- 

 ians and reptiles, 1917, p. 124. 



Type.—Mvi^. Comp. Zool. Nos. 1901-1910, cotypes; W. H.Emory 

 collector. 



Type locality. — Rio Grande River, near Brownsville, Tex. 



Range. — Southern Oldahoma and Arizona southward into northern 

 Mexico. Recorded from Coahuila: Hacienda Los Borregos (near 

 Judrez), San Juan, Cuatro Cienegas, Hacienda La Gacha; Nuevo 

 Leon: Rodriguez; Tamaulipas: Matamoros, Rio Purificaci(5n north of 

 Ciudad Victoria; Baja California?. 



Suborder Cryptodira Cope 



Cryptodira Cope, Proc. Amer. Assoc. Adv. Sci., vol. 19, 1870, p. 235. 



Families. — Six, all but one of which (Platysternidae, southern Asia) 

 occur in Mexico. 



•« Muller (Verb. Naturf. Ges. Basel, vol. 6, 1878, p. G41) records A. mutica also from "Mexico." The 

 record requires conflrmation. 



