APPENDIX B. 
DBSCEIPTIONS OP A NEW SPECIES 
OF 
FRESH-WATER TURTLE AND CHAMiiLEOK 
By Dr. J. E. GDAY, E.E.S. 
“ BRITISH MUSEUM, 
“ Julf Srd, 1869, 
dear Sir^ 
I am very glad to hear that you are about to publish 
the result of your travels in the Upper Nile basin. 
Among the very interesting specimens which you sent to the 
British Museum are two very large full-grown^ soft-back fresh- 
water or mud tortoises^ which you obtained from Khartoum, 
When I first received them^ I believed that they were identical 
with the soft-back fresh- water oi mud tortoise of the Lower Nile^ 
which is now called Tyrsa Niloticaj and gave an account of them 
in my description of that animal^ published in the Proceedings 
of the Zoological Society for 1864. 
The TrionicliidcE ^ or mud_, or soft-backed tortoises are very un- 
