248 BKIDGER FAUNA. 



those of the present genus. Dr. Filhol's l)eautiful collection, made in the 

 Phosphorite beds of Southeastern France, was, through his liberality, 

 thrown open to me, and I used the opportunity to study the extinct lemurs. 

 There is much resemblance between the inferior jaw, with its dentition, of 

 the genus Necrolemur* and that of Anaptomorphus, but the two inferior 

 premolars of his Necrolemur antiquus have but one root. This chai-acter 

 constitutes a basis for its generic sepai'ation from the A. aemulus. 



AXAPTOMORPHUS AEMULUS CopS. 



Paleontological Bulletiu, No. 8, p. 1, Oct. 12, 1872. Proceed. Amer. Philos. Soc, 1872, p. 554. Annual 

 Report U. S. Ofol. Surv. Terrs., 1872 (1873), p. 549. 



Plate XXV, tig. 10. 



This species was about the size of a marmoset, or of a red-squirrel. 

 The teeth are all closely packed. Tlie alveolus supposed to be that of 

 the canine, is round and a little larger than that of the external incisor. 

 The anterior premolar has two roots; the anterior one much smaller than 

 the posterior. Tlie second root of the last true molar is inserted in the 

 lower part of the ascending ramus, so that the tooth was obliquely placed. 

 The anterior cusps of the true molars preserved are a little higher than the 

 posterior. There are no cingula, and the enamel is entirely smooth. There 

 is a small mental foramen, which is below the anterior alveolus of the ante- 

 rior premolar. 



Measurements. 



M. 



T.injj'th of dental line '0140 



l.engtli of last molar 0030 



l.eni^tli of antepenult 0030 



Width of .inteponult 0020 



I.eiijjilli of tliree niiilar» preserved 0070 



From the Bridger beds of the upper valley of Green River. 

 The mandibular ramus of the Necrolemur antiquus is longer and rela- 

 tively less robust than that of the American animal, according to Filhol. 



•Recherches s. les Phosphorites du Quercy, 1877, p. 275, flg. 216. Annalesdes Sciences Natnrelles, 

 1874. 



