CHELYDID^:. 489 



65. Sternotharus derbianus, Gray. Derbian Sternothere. 

 Hob. West Africa. 



a. Purchased, Aug. 30, 1870. 



b. Received in exchange, Oct. 25, 1870. 



c. Purchased, Feb. 15, 1872. 



d. Presented by C. B. Mosse, Esq., C.M.Z.S., May 6, 1872. 



66. Sternoth&rus niger, Dum. et Bibr. Black Sternothere. 

 Hob. West Africa. 



a. Purchased, June 12, 1876. 



b. Purchased, May 10, 1877. 



c. Received in exchange, April 6, 1878. 



Genus PELOMEDUSA. 



67. Pelomedusa gehafi (Hupp.) . Abyssinian Pentonyx. 

 Hab. Abyssinia. 



a. Presented by the Hon. Mr. Melville, June 2, 1868, 



b. Eeceived in exchange, Sept. 4, 1875. 



Genus PLATEMYS. 



68. Platemys gordoni (Gray) . Gordon's Terrapin. 

 Hab. Trinidad. 



a. Deposited by the Hon. A. Gordon, July 23, 1868. Speci- 

 men described and figured as Hydras/pi* gordoni by Dr. 

 Gray, P. Z. S. 1868, p. 563, pi. XLII. Prom Trinidad. 



69. Platemys geoffroyana (Schweigg.). Geoffrey's Terrapin. 

 Hab. Argentine Republic. 



a, b. Presented by George Wilts, Esq., C.M.Z.S., June 17, 



1871. See P. 7*. S. 1871, p. 623. 

 c~e. Purchased, Jan. 19, 1876. 



Genus HYDROMEDUSA. 



70. Hydromedusa maximiliani (Mikan). Maximilian's Ter- 

 rapin. 



Hab. Brazil. 



a-d. Presented by Dr. Palin, C.M.Z.S., Sept. 19, 1871. 

 e. Purchased, Jan. 20, 1876. 



