602 ON ARCTOCEBUS CALABARENSIS 
With regard to the other teeth, the hindermost upper molar of 
Otogale pallida is quadricuspidate, though the inner posterior cusp is 
low, as in the first and second molars. 
In the lower jaw the fifth cusp of the last molar is distinct, and 
the oblique ridges do not reach the antero-internal cusp. 
In Galago sennaarensis the inner posterior cusp of the last upper 
molar is obsolete; but the fifth cusp of the last lower molar is well 
developed and ridge-like. In this species the lower molars might be 
vettnetecee Qe = 
Fic. 4. Fic. 5. 
Right dental series of both jaws of Right molars and premolars of both jaws of 
Perodicticus potto. Galago sennaarens?s. 
A and C, upper ; B and D, lower jaw. A and C, upper; B and D, lower jaw. 
said to be Tapiroid, the elevation which answers to the oblique ridge 
being shorter and less distinct, while the two transverse ridges 
connecting the outer and inner cusps are more obvious (fig. 5, D). 
Galago maholt, also, has the inner posterior cusp of the last upper 
molar obsolete, and Tapiroid lower molars, the last of which is 
quinquecuspid. 
Galago allentt has the inner posterior cusp of the third upper 
molar well developed ; the lower molars are provided with an oblique 
ridge, nearly reaching the inner anterior cusp, while the third has a 
large fifth cusp. 
