194 PELOMEDUSID &. 
II. Suture between the abdominal shields shorter than that between 
the humerals; plastral hinge feeble. 
The length of the outer border of the pec- 
toral shield equals that of the humeral. 5. adansonii, p. 196. 
The length of the outer border of the pee- 
toral is less than that of the humeral .. 6. gabonensis, p. 197. 
1. Sternotherus niger. 
Sternotherus niger, Dum. § Bibr. ii. p. 397, pl. xx. fig. 1 1835) ; 
Gray, Cat. Tort. p. 37 (1844), and Sh. Rept. i. p. 51 (1855), and 
Suppl. p. 81 (1870); Peters, Mon, Berl. Ac. 1875, p. 196. 
Sternothzrus, sp., Gray, Proc. Zool. Soc. 1875, p. 895, fig. 
Carapace with a feeble, interrupted keel. Plastral shields appa- 
rently as in S. derbianus. Upper jaw strongly hooked, not notched ; 
the width of the interorbital space is less than the longitudinal 
suture between the two shields on the snout. Shell black; head 
fulvous above, marbled with brown; jaws yellowish, with vertical 
brown lines. , 
West Africa (Cameroons). 
a. Ad., skull. W. Africa, M, Du Chaillu [C.]. 
2. Sternotherus sinuatus. 
Sternotherus sinuatus, Smith, Ill. Zool. S. Afr., Rept. pl. i. (1888) ; 
A, Dum. Cat. Méth. Rept. p. 19 (1851); Gray, Proc. Zool. Soc. 
1863, p. 193, and Suppl. Cat. Sh. Rept.i. p.78 (1870) ; Peters, Reise 
n. Mossamb. iii. p. 8 (1882). 
dentatus, Peters, Arch. f. Anat. u. Phys. 1848, p. 494. 
castaneus, Gray, Cat. Tort. p. 37 (1844), and Sh, Rept. i. p. 52 
(1855). | 
Carapace rather elongate, posterior margin more or less serrated 
or sinuated, except in old specimens; second and third vertebral 
shields about as long as broad in the adult. Intergular shield more 
than twice as long as broad; suture between the abdominal shields 
longer than that between the femorals; the length of the outer 
border of the pectoral shield is as great or a little less than that of 
the humeral, and exceeds the length of the inner border of the latter 
shield. Head moderate; snout short ; upper jaw notched in the 
middle, with a very slight, rather indistinct obtuse cusp on each 
side of the notch; interorbital width less than the longitudinal 
suture between the two shields on the snout. Carapace dark 
brown or blackish; plastron yellow or blackish ; head pale brown 
above, with darker vermiculations. 
Length of shell 22 centim. 
South Africa ; East Africa south of the Equator; Seychelles. 
