EXTINCT LEMUROIDS 697 



erinaceus, of the upper Eocene of Hampshire, of which the corre- 

 sponding teeth are shown in B of the same figure. In this genus, 

 according to Dr. Schlosser, the dental formula is i \, c ], p |, m §, 

 or the same as in the existing Tardus ; hut it is not improbable that 

 in some instances the hist lower premolar may have been developed. 

 The upper molars of J/, mnaceus differ from those of M. antiqwus 

 by the simpler structure of their columns and the smaller size of 

 the external cingulum, which lacks the median cusp found in the 

 latter. The angle of the mandible is produced into a large hook- 

 like Mange which at once 

 distinguishes the genus ,v^if%3fcT»^ 



from all existing Lemurs : /|l^i©K® A 



and the anterior lower 

 premolar is not canine- 

 like. M. antiguus is of 

 very small size, but the 



larger M. rdwanhi of the (^^^^^O^iM' $ ' j '$$^^3[s 

 same deposits comes 



nearer in dimensions to F "- -The last five right upper cheek-teeth of Jftcro- 

 . 1 antvquus (A) and Microclwmis erinaceus (B). Jwice 



M. enmceUS. Ihe Upper natural size, and natural size 



molars decrease in size 



from the first to the third, the first and second having a median 

 cusp in the external cingulum, by which they are readily dis- 

 tinguished from the corresponding teeth of the under-mentioned 

 genus Hyopsodus. The third upper molar differs from that of 

 Hyopsodus by its small size and the abortion of its posterior columns. 

 The skull approximates to that of the living genus Galago, exhibit- 

 ing the same inflation of the auditory bulla. The upper molars 

 are also not unlike one species of that genus, but the fourth upper 

 premolar has but one outer cusp, as in Chirogaleus. 



The small Anaptomorphus, from the North American Eocene, 

 has a skull of about the same size as that of the smallest species of 

 Microcharus, but the dental formula is i §, c \, p §-, m |, and the 

 upper molars are of the tritubercular type. 



The well-known Ada/pis (Aphelotheriwm or Palceolemur), of the 

 Upper Eocene of France and England, differs from all existing 

 Lemuroids in possessing four premolars 1 ; the dental formula being 

 i •§, c \, p j, m :;. The fourth upper premolar has two outer cusps, 

 and the upper molars (Fig. 333) resemble those of Lepidolemur and 

 Hapalemur, while the lower canine is a well-developed tooth per- 

 forming the usual function of biting against the canine of the upper 

 jaw. The lower incisors have upright, spatulate crowns, as in the 

 true Apes. The skull is said to approximate in contour to that of 

 Propithecus. The typical A. parisiensis is of comparatively small 

 size, but the species of which the upper check-teeth are shown in 

 1 One specimen lias been seen with only three lower premolars. 



