200 Bulletin American Museum of Natural History. [Vol. XVI, 



Chronological List of Species. 

 Sp. (2 1) ? Hemiacodon gracilis Marsh Bridger. 



(22) ? " nanus " 



(23) ? " pucillus " " 



(26) ? " {P alceacodon) vagus M.3ir&h 



(28) ? Anaptomorphus ceniulus Cope " 



(39) ? Pelycodus angulatus Co-pe Wasatch (Indeterminate). 



(47) Anaptomorphus homunculus Cope Wasatch. 



(54) " (Microsyops) uintensis Osbom Uinta. 



Other animals to be 

 considered in this con- 

 nection are Leidy's 

 Washakius insignis, Fig. 

 23a, 'Microsyops' speiri- 

 anus Cope, Fig. 37, 

 and Palcsacodon vagus 

 Marsh. 



It appears that Os- 

 bom was mistaken (Os- 

 born and Wortmani892, 



p. 102) in referring to this family the genus and species 



Omomys carteri Leidy. 



Genus ANAPTOMORPHUS Cope. 



Fig. 23a. IVa- 

 shakius insigtiis. 

 Type. Phila. A- 

 cad. External, su- 

 perior, and internal 

 views. 



Fig. 24. AnnptomorpJiKS 

 homunculus. Type. Am. 

 Mils. Cope. Skull, No. 41Q4 ; 

 partly reconstructed from the 

 two sides. Jaw from another 

 specimen. Am. Mus. No. 43. 

 Natural size. 



Paraconid reduced, hypoconulid absent except on nig, canines of 

 medium size. 



I. Wasatch (Sparnacien, Ypresien) Stage. 



(Sp. 47) Anaptomorphus homunculus Cope. — Type skull, 

 Amer. Mus. Cope Coll. No. 4194. 



Definition. — i.^, c. -}-, p. |, m. |. M i-m 3 with reduced paraconid, 

 P4 with very slight rudiment of deuterocone. 



The species is represented by the famous type skull, also 

 by specimens Nos. 41, 44. Paraconid on m^ somewhat larger 

 than in the Bridger A. (Bniulus; the deuteroconid is barely 

 visible on p^ ; there is a very small alveolus for the root of 

 the second lower premolar. 



The skull has been refigured with care (Fig. 24) to exhibit 



