1902.] Osborn, American Eocene Primates. I 89 



Genus SARCOLEMUR Cope. 



Entomodon Marsh, Aniiacodon Cope. 



I. Bridger (Bartonien) Stage. 



The type of the genus is the jaw of the species S. (Aniia- 

 codon) furcatus Cope, belonging to an animal about the same 

 size as Hyopsodus patilus but well distinguished by the 

 presence of a prominent paraconid which is closely connate 

 with the metaconid, also by the more crescentic form of the 

 external cusps (protoconid and hypoconid), and by the more 

 elongate form of the fourth premolar (Fig. 16). Three in- 

 ferior molars =15 mm. 



S. pygmcsus Cope. 5. furcatus Cope. 



P4 simple, lacking internal cusp. P4 complex, elongate, with promi- 

 nent internal cusp. 



(Sp. 11) Sarcolemur pygmaeus Cope. — This species, from the 

 Bridger basin of Wyoming, was originally referred by Cope to 

 Hyopsodus. It bears a su- 

 perficial resemblance to Mi- 

 crosyops but the simple 

 structure of p^ and the more 

 elevated and connate para- 

 and metaconids readily dis- 

 tinguish it; the hypoconulid 

 on m, and m, is quite distinct „. „ , 7" ^ , 



1 .IT. r\%. 17. Sarcolemur pygmceus. Co-type 



as in Hyopsodus, enabling us ^m. Mus, No. 5007. Left ramus, internal 

 ■'I ' o and superior views. Iwice natural size. 



to readily distinguish this 



type of molar from that of Anaptomorphus. 



(Sp. 31) Sarcolemur furcatus Cope. — Represented by the 

 type lower jaw in the American Museum (No. 5008) con- 

 taining the fourth premolar and three molars. With this 

 should be compared the prior type of (Sp. 24) Entomodon 

 comptus Marsh, a fourth lower premolar closely resembling 

 that of Sarcolemur; if identical Entomodon has priority. 



