196 PELOMEDUSID A. 
longer than that between the femorals; the length of the outer 
border of the pectoral shield is much less than that of the humeral, 
and does not exceed the length of the inner border of the latter 
shield. Head large; snout very short; upper jaw neither hooked 
nor bicuspid ; the width of the interorbital space at least equals the 
longitudinal suture between the two frontal shields. Dark brown 
or blackish, plastral shields usually yellowish in the middle; head 
brownish above, closely vermiculated with black; upper lip with 
blackish dots or vertical lines, 
Length of shell 27 centim. 
West Africa. 
a. 2 siti, Gambia.. Earl of Derby [P.]. (Type.) 
b. Q, shell. Sierra Leone. 
c,d. Her. & yg., stffid. Cape Verde. M. Boucard [C.]. 
e. Her., spir. Angola. J. J. Monteiro, Esq. [P. }. 
t,9,h. 3 Q, stfid. W. Africa. 
1,k. 3 Q, shells. W. Africa. 
i, Yg., spir. W. Africa. 
m. Yg., spit. 
5. Sternotherus adansonii. 
Imys adansonii, Schweigg. Prodr, p. 39 (1814). 
Hydraspis adansonii, Gray, Syn. Rept. p. 40 (1851). 
Pentonyx adansonii, Dum. § Bibr. ii. p. 894 (1835). 
Pelomedusa ? adansonii, Gray, Cat. Tort. p. 38 (1844). 
Sternothzerus adansonii, A. Dwm. Cat. Méth, Rept. p. 19 (1851); 
Gray, Cat. Sh. Rept. i. p. 52 (1855), and Proc. Zool. Soc. 1864, 
p. 296, pl. xxiii., and Suppl. Cat. Sh. Rept. i. p. 80 (1870). 
Carapace keeled throughout life; second and third vertebral 
shields nearly as long as broad in the adult. Hind lobe of plastron 
narrower than in the preceding species. Intergular shield not 
twice as long as broad; suture between the abdominal shields 
shorter than that between the femorals; the length of the outer 
border of the pectoral shield equals or slightly exceeds that of the 
humeral. Head large; snout very short; upper jaw neither hooked 
nor bicuspid; the width of the interorbital space equals the longi- 
tudinal suture between the two frontal shields. Shell yellowish or 
pale brown above, with dark brown dots and radiating lines ; 
uniform yellow inferiorly ; head brown above, elegantly vermiculated 
with yellow; lips and lower parts uniform yellowish. 
Length of shell 15 centim. 
Senegambia and Sudan. 
a,b,c. 6,2, & her., stfid. W. Africa. 
d-e, f. Hgr., spir. W. Africa. 
g. Ter., shell. W. Africa. 
A, Hegr., spir. Upper Nile. Consul Petherick [C.}. 
