APPENDIX B. 
191 
seen tliat even the stuffed specimens from Khartoum had a shorter 
and more rounded face than the stuffed specimens of the Nilotic 
Trionyx, though it had previously been overlooked. The alveolar 
or chewing surfaces of the upper and hinder jaws are very wide 
and nearly flat^ while the same parts of the jaws of the Nilotic 
Trionyx or Tyrse Nilotica are attenuated,, concave^ and sharp edged 
in front,, and only broad and flattened on the sides. The Khartoum 
mud tortoise may be then described : 
Fordia. — Head shorty broad; face short; forehead convex^ with 
a narrow linear deep anterior palatine grove in the skull^ rather 
shallow. Alveolar surface of the beak of the upper jaw very wide ; 
the beak of the lower jaw very broad, as wide in front as on the 
side, quite flat; granular, with a very indistinct indication of a 
longitudinal central ridge in front. 
The hinder pair of costae about half as broad as the pair of 
costae before it. 
Africa. The genus is known from trionyx by the flatness and 
width of the alveolar surface of the beak. 
Fordia africana. — The head and neck (and most likely the 
other parts of the body, limbs, and dorsal shield) olive, minutely 
and regularly speckled with small regular white spots. 
^^The hinder sternal callosities triangular, rather longer than 
wide, straight in front and the inner side very acute behind. — 
Fordia africana, Gray, P.Z.S., 1869. 
Hab., Upper Nile, Khartoum. Adult male and female in 
the British Museum. 
‘^The head and neck of these large specimens, when the skin 
was wet, showed that it is speckled with white, like the true Nilotic 
mud tortoise, Tyrse Nilotica, The sternal callosities differ rather 
in form from those of Tyrse Nilotica; the hinder ones are larger 
