202 Bulletin American Museum of Natural History. [Vol. XV I, 



The species Pelycodus angulatus Cope was based upon a 

 type (Nat. Mus.), now unfortunately lost, containing a single 

 lower molar which resembles that of Anaptomor phus , also that 

 of Cynodontomys. In the absence of the type this species is 

 indeterminate. 



2. Bridger (Bartonien) Stage. 



Fig. 26. Anapto- 

 tn o r/> h 11 s cemiilus. 

 Type. Am. Mus. 

 Cope, No. 5010. A, 

 from side; A^ ^ recon- 

 structed from above. 



(Sp. 28) Anaptomorphus aemulus Cope. — 

 Type, No. 5010, Amer. Mus. Cope Coll. 

 This famous little jaw (Fig. 26) is the type 

 of the genus. It exhibits progression on the 

 Wasatch species in the loss of the second 

 premolar, the formula being: I. 5, C. y, 

 P. ^, M. ^; paraconid especially on m^ is 

 also slightly more reduced, while the deu- 

 teroconid on pj is slightly more pronounced, 

 but still not separate. 



3. Uinta (Ligurien) Stage. 



INCERT^ SEDIS. 



(Sp. 54) ? " Microsyops " uintensis 



Osborn. — A reexamination of the type 

 of Microsyops uintensis (Amer. Mus. 

 No. 1899) demonstrates that the 

 reference of this type to Microsyops 

 was an error, because the fourth lower 

 premolar is totally unlike the molars. 

 Its nearer reference is either to the 

 Anaptomorphidas or to some member 

 of the Notharctidae. 



Fig. 27. " A/icrosyops" uin- 

 tensis. Type. Am, Mus. No. 



