570 CHELYDID^E. 



68. Sternotharus derbianus, Gray. Derbian Sternothere. 

 Hob. West Africa. 



a. Purchased, Aug. 30, 1870. 



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



c. Purchased, Feb. 15, 1872. 



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

 e,f. Purchased, March 3, 1881. 



69. Sternotharus niger, Dum. & Bibr. Black Sternothere. 

 Hab. West Africa. 



a. Purchased, June 12, 1876. 



b. Purchased, May 10, 1877. 



c. Eeceived in exchange, April 6, 1878. 



Genus PELOMEDUSA. 



70. Pelomedusa gehafi (Riipp.) . Abyssinian Pentonyx. 

 Hab. Abyssinia. 



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



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



c. Deposited, July 23, 1881. 



71. Pelomedusa galeata. Galeated Pentonyx. 

 Hab. South Africa. 



a. Presented by W. A. Watkins, Esq., Oct. 10, 1882. 



Genus PLATEMYS. 



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

 Hab. Trinidad. 



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

 men described and figured as Hydraspis gordoni by Dr. 

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



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

 Hab. Argentine Republic. 



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



1871. See P. Z. S. 1871, p. 623. 

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



