22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



D^.fcn>;ion.— Intermediate in size between Peratheriiim chesteri 

 and Peratherium edwardi, but closer to the latter. Talonid basin of 

 lower molars relatively a little shorter and entoconid less developed 

 than in P. edwardi. 



Discussion.— The specimen designated as the type of F. morrisi 

 was listed by Morris as Peratherium, cf. P. marsupium. The teeth 

 are decidedly smaller than in any of the Bridger P. marsupium ma- 

 terial in the National Museum collections and, as in comparison with 

 P. edwardi, the talonid appears relatively shorter. The possibility of 

 the Cathedral Bluffs specimen representing the Bridger species P. 

 marsupium seems very questionable. 



INSECTIVORA 



LEPTICTIDAE 



DIACODON, cf. ALTICUSPIS Cope 



The Princeton specimen of Diacodon, No. 16171, was cited (1952) 

 as coming from about 100 feet below the Green River beds in the 

 vicinity of Fossil Butte in the Fossil Basin. While the Knight here 

 is regarded as Lysite in age, there remains a possibility that the 

 lowest of these, as west of Elk Mountain, may be Gray Bull in age. 

 There is, however, no faunal evidence to show this. No additional 

 material that may be referred to Diacodon, cf. alticuspis, has been 

 encountered. 



PALAEICTOPS, cf. TAURI-CINEREI (Jepsen) 

 (Plate I, figure 5) 



A portion of a right maxilla with the three molars, U.S.N.M. No. 



22122, from the lower Wasatchian horizon at Bitter Creek may well 

 belong to the Gray Bull species Palaeictops tauri-cinerei of the 

 Bighorn Basin. The teeth correspond closely in size to those of 

 Jepsen's species, and their structure seems almost identical to that 

 in the type specimen, rather less like Palaeictops hicuspis (Cope). 

 In the absence of known upper teeth of Palaeictops pineyensis, no 

 comparison with the later Lostcabinian form is feasible, other than 

 to note that the teeth are a little smaller than would be appropriate 

 for good occlusion. 



PALAEICTOPS PINEYENSIS (Gazin) 

 (Plate I, figure 4) 



A small jaw fragment with only P3 preserved, U.S.N.M. No. 



22123, and a maxilla with Mg, U.S.N.M. No. 22444, were collected 



