44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



TAENIODONTA 



STYLINODONTIDAE 



ECTOGANUS, sp. 



(Plate 12, figure 7) 



Three lower teeth, including Dp4 and portions of two molars, seem 

 almost certainly to represent Ectoganus. They were found on an 

 exposure of Knight in the Fossil Basin, immediately to the west of 

 the saddle which separates Fossil Butte from the Green River capped 

 table to the north. The Dp4 corresponds very closely to this tooth 

 in the type of E. gliriformis, as well as to a Dp4, showing only slightly 

 greater wear, in the jaw belonging to the Gray Bull skull (U.S.N.M. 

 No. 12714) that I described in 1936. The two molar teeth are in- 

 complete but show no wear, so that I suspect they may be M2 and 

 M3 rather than Mi and M2 as here illustrated (pi. 12, fig. 7). There 

 is some suggestion in the height of cusps, distribution of enamel, and 

 separation of roots that the teeth may be very slightly higher crowned, 

 Dp4 as well as the molars, than in the type or in the Gray Bull speci- 

 men. It is of further interest to note that the tooth thought to be M3 

 shows a slight paraconid and a hypoconulid somewhat as in the teeth 

 figured by Wortman (1897, fig. 24) as "Calamodon simplex." None 

 of the comparatively imworn molars in U.S.N.M. No. 12714 shows 

 evidence of a hypoconulid. This is evidently a variable feature. 



Undetermined STYLINODONT 



No further information is forthcoming as to the generic identity 

 of the stylinodont skeleton from the locality in the La Barge horizon 

 north of Big Piney, described in 1952. It may well be Stylinodon, as 

 this genus has been recorded in Lost Cabin beds of the Wind River 

 Basin, as well as in the Bridger formation. There is no certainty, 

 however, that earlier Ectoganus did not persist as such into later 

 Wasatchian time. 



EDENTATA 



EPOICOTHERIIDAE? 



PENTAPASSALUS PEARCEI Gazin 



There has been no additional material discovered of this small 

 armadillolike edentate in the La Barge fauna, although a metacarpal 

 of a somewhat longer-toed form in the Bitter Creek fauna is dis- 

 cussed below. 



