QUADRUMANA. 



215 



often wanting. The first molar of the lower jaw 

 on each side is so much acuminated and in- 

 curved that it resembles a canine. The muzzle 

 is short and triangular ; the ears small ; large 

 nyctalope eyes, close to each other ; no tail, 

 or a short one, and a long narrow tongue. 

 They feed upon insects. Their habits are 

 nocturnal, and their movements very slow. 

 They inhabit Eastern Asia. 



Spec. Stenops lardigradus, S. gracilis, S* 

 javanicus. 



To these ought to be added the Stenops 

 potto BOSMAN, coming from the coast of 

 Guinea. It has a short tail and a short index. 

 In a skull of a young Stenops potto, from the 

 Museum at Ley den (fig. 135), the distance 



Fig. 135. 



Skull of Stenops potto. ( Original, Mus. Let/den.*) 



between the two orbits is much larger than 

 in Stenops javanicus, tardigradus and gracilis. 

 It is the narrowest in Stenops gracilis, broader 

 in Stenops javanicus, still broader in S. tardi- 

 gradus, and the broadest in S. potto. In 

 S. potto the circular boundary for the orbits 

 is not so distinct as in other species. 



Fourth Genus. Lichanotus ILLIGER. Indri. 



The same form of teeth, but they have only 

 two incisors in the lower jaw. This genus 

 has but one species (L. Indri), distinguished 

 by the want of the tail. Madagascar.. 



The dental formula is : 



Incisors, - ; canines, - - r molars, =30. 



Fifth Genus. Semnocebus LESSON. Avahi. 



The Semnocebus approaches very much to 

 Lichanotus, from which it differs by the exist- 

 ence of a tail, and by the form of its skull. 

 In askullof theAvaki, Mus. Leyden (fig. 136), 



Fig. 136. 



Skull of the Avahi. ( Original, Mus. Leyden.) 



I observe a depression on the frontal surface, 

 between the two orbits, which part is, on the 

 contrary, convex in Lichanotus. The muzzle 

 is not so much protruded as in Lichanotus, 

 and more flat on its anterior part, formed by 

 the intermaxillary bones. The teeth are the 

 same in both. Madagascar. 



Spec. Semnocebus laniger or Avahi. 



Sixth Genus. Cheirogaleus. 



Among the unpublished drawings of Com- 

 merson, Geoffrey St. Hilaire discovered re- 

 presentations of certain Lemur-like animals, 

 which he considers as constituting a distinct 

 genus. The characters were at first very in- 

 distinct ; but we are now acquainted with the 

 external aspect, the skull, and the teeth of 

 this genus. The dental formula is : incisors, 



t? ; canines, tzl ; . molars, ^6=36. The 



6 1 1 5 5 



superior incisors are situated in two pairs, 

 with a great interval between both. On each 

 side of the upper jaw there is a large canine, 

 with six molars, of which the two first have 

 acuminated crowns, and seem to be spurious 

 molars; the four posterior are tuberculated. 

 In the lower jaw there are six long and narrow 

 proclive incisors, of which the two exterior 

 are the strongest ; a vertical canine on each 

 side ; a spurious molar with acuminated 

 crown, and five true tuberculated molars. 

 In the form and the size of the skull, Cheiro- 

 galeus has some analogy with Lemur, parti- 

 cularly by a peculiar opening in the zygo- 

 matic bone. The muzzle however is not 

 so prominent, and the interval between the 

 orbits smaller. The form of the skull is in- 

 termediate between Lemur and Stenops. 

 Spec.. Cheirogaleus COMMERSONII. 



Seventh Genus* Lemur* Maki^r. Meer-kal, 

 Dutch.. 



Incisors, _.. ; canines,-^ ; molars, t = 36. 



4< 1 1 6 6 



The six inferior incisors are compressed and 

 directed forwards ; of the four superior ver- 

 tical incisors, the two middle are distant from 

 each other ; the canine teeth are very acumi- 

 nated ; the molars acuminated and alternating 

 in each jaw. The ear not much developed. 

 The tail long, bush)', and highly ornamented. 

 The muzzle is very prominent, lengthened, 

 and pointed ; for which reason the French call 

 the Makis Singes a museau de renard. They 

 feed upon fruits, and inhabit chiefly Mada- 

 gascar. 



Spec. Lemur catta, L* macaco, L. ruber, 

 L. mongos, L. albifrons, L. nigrifrons, L. rufus t 

 L. albimanus, L. cinereus. 



The Lemur murimis, Maid nain ought to be 

 separated from the other Lemurs. It seems 

 a transition to Otolicnus. 



Eighth Genus. Galeopithecus. Vliegcnde-kat, 

 Dutch. 



This genus has been considered by Cuvier 

 to belong to the Cheiroptera, but Temminck 

 and De Blainville have perfectly well de- 



p 4 



