CLASSIFICATION OF THE LEMUROIDEA 433 



BullfE and entocarotid foramina essentially as in Lemuridse. 

 Trochlea of astragalus narrow. 

 Metacarpals and metatarsals short. 



Subfamily IsTotharctinffi 



Lower and Middle Eocene of Xorth America. 



Posterointernal cusp of m^, m-, progressively derived from anterointernal 



cusp; m^ — m'' acquiring a mesostyle (in Notharctus and Telma- 



lestes) ; mj^ — mg with entoconids progressive. 

 Genera : PelycodiLS, Notharctus, Telmalestes. 



Subfamily Adapinse 



Chiefly Middle and Upper Eocene of Europe (rare in upper part of 



Lower Eocene). 

 Posterointernal cups of m^, m-, progressively derived from the cingulum ; 



m^ — m^ without mesostyle; m^ — m^ with entoconids retarded, 



talonids enlarged. 

 Forehead very narrow. 

 Angle of mandible much expanded. 

 Genera: Protoadapis, Adapis, Leptadapis, f Pronycticehus. 



Family Lemuridae 



Pleistocene and Eecent of Madagascar. 



Dental formula: I » C— ' P— ' M — 



2 1 3 3 



Lower incisors styliform, procumbent ; upper incisors reduced or wanting. 



Lower canines resembling the incisors. 



Po more or less caniniform, opposing upper canine. 



Lacrymal extended on face ; lacrymal foramen in front of orbit. 



Brain-case usually expanded. 



Sagittal and lambdoidal crest absent or reduced. 



Angle of mandible typically slender. 



Upper molars more or less ti'itu1:)ercuhir, rarely with mesostyle. 



M3 with third lobe (hypocoiudid ). 



. Suljfamily Lcmurinre 



Size moderate. 



Foramen lacerum medinm roofed over. 

 Posterior nares opening near or behind m-. 

 Genera : Lemur, Lepilemur, Mixocebus. 



