CHELONIA. 



1 



1. ASPIDONECTES EMORYI, Agassi z.— Soft-shelled Turtle. 



Aspido?iectes Emoryi, Agassiz, Contributions to Nat. Hist. U. S., I, 1857, 407. 



Lower Rio Grande of Texas. J. H. Clark. 



2. GYPOCHELYS LACERTINA, Agassiz.— Alligator Turtle. 



Gypochelys lacerlina, Agass. Cont. I, 1857, 414. 

 Chelydra lacertina, Schweigger, Prodromus. 

 Chelonura temminckii, Holbrook. 



Lowlands of Texas. 



3. OZOTHECA TRISTYCHA, Agassiz 



Ozotheca tristycha, Agassiz, Cont. I, 1857, 425 

 Medina river, Texas. Dr. Kennerly. 



4. THYROSTERNUM SONORIENSE, Agassiz. 



Kinosternon sonoriense, Leconte, Pr. A. N. Sc. VII. 1853, 184. 



Thyrosternam sonoriense, Agassiz, Contributions, I, 1857, 428; pi. v, figs. 8-11 



Tucson and Guadalupe canon. Dr. Kennerly. 



5. PLATYTHYRA FLAVESCENS, Agassiz. 



fi 





Texas, and valley of Gilla. 



6. PTYCHEMYS MOBILENSIS, Agassiz. 



Emys mobUemix, Holbrook, N. Am. Herp, I, 1842, 71; pi. \x, 



Ptychemys mobilensis, Agassiz, Contributions, I, 1857, 433; pi. iii, figs. 14 — 16 



Guadalupe mountains and Pecos river, Texan. 



7. TRACHEMYS ELEGANS, Agassiz. 



Emys elegant, Maxim. Reise Nord. Am. I, 1839, 213. 

 Trachemys elegans, Agassiz, Cont. I, 1857, 435. 



Brownsville, Texas. 



1 Note. — The descriptions of genera and ppecies in the present article have been either omitted entirely, or in most cases 

 greatly curtailed, owing to the fact that the report, as prepared, greatly exceeded the limit* of space Mrigned. 



A number of the species have been determined, or their characters bettor defined, by Dr. Girard and Mr. Kennicott. The 

 I ontribtitions of those gentlemen hsve their name attached. — (S. F. Baird.) 



