326 PROF, HUXLEY ON ARCTOCEBUS CALABARENSIS. [June 28, 
The lower molars have the oblique ridge and the anterior basal 
process so developed as to assume, in some cases, a doubly crescentic 
or Rhinocerotic character (fig. 6, D). 
ScaleL£.NS. 
Right molars and premolars of Lemur catta. A and C, upper ; B and D, lower jaw. 
In the Indri (fig. 7), lastly, there is a type of dentition which de- 
parts still further from that of Angwantibo. Of the upper five grind- 
ers, the two anterior are unicuspidate, and like the premolars of 
Fig. 7. 
Right molars and premolars of Lichanotus indri. A and C, upper ; 
B and D, lower jaw. 
other Lemurs; the other three are quadricuspidate, the hindermost 
being the smallest. Each pair of cusps is united by a transverse 
ridge, and there is no oblique ridge. 
