94 LEMURIDE. 
forming serrated crests covered with a blackish skin. Blackish brown; 
fur yellowish, blackish-washed on the surface ; chin, throat, and be- 
neath yellowish brown ; hair very close, woolly, yellowish, with 
longer black-tipped and rigid hairs; penis retractile into a sheath, 
with roundish opening; scrotum large Warrick, p. 46, t. 8. 
f. 28. 
Perodicticus Geottroyi, Bennett, P. Z. S. 1830, p. 109; Murray, Proc. 
Roy. Phys. Soc. Edinb. 1860, p. 191, figs. of fiands and.feet. Potto 
Bosmani, Lesson. Lemur potto, Ginel. S. N. p. 42. Galago 
guineensis, Desm. Mamm. p. 104. Potto, Bosman. Nycticebus 
potto, Geoff. Ann. Mus. xvii. p. 114; xix. p. 115. 
Hab. Sierra Leone, West Africa. 
Skull and skeleton in British Museum. 
Fig. 18. 
Perodicticus potto. (Huxley.) 
15. ARCTOCEBUS. 
Tail very short. Hands and feet small, with the lower phalanges 
(not including the thumb) united in the skin, the two upper joints 
free; the index finger abortive, reduced to a tubercle. Lower cut- 
ting-teeth small, hyaline, hidden by the lips. 
se a Gray, P. Z. S. 1863, p. 150; Husley, P. Z. S. 1864, 
p. 335. 
