11 



Measurements. 



M. 



Length metacarpal No. 3 074 



" " No.4 070 



" " No. 5 053 



" scaphoid transversely 023 



" cuneiform " 027 



" pisiform 027 



Width " distally 016 



Length unciform transversely 020 



Width " antero-posteriorly '. 013 



" trapezoid " 0155 



" trapezium " 0114 



Length " vertically 016 



Width scaphoid antero-posteriorly 015 



' " navicular " 0155 



Length " transversely 0255 



" ungueal phalange 016 



Width " " 010 



Diameter centrum of lumbar vertebra 029 



" " caudal " 009 . 



The dental series is uninterrupted from the canine if, as I believe, 

 there is an alveolus for a simple premolar behind it. This I overlooked 

 when first describing the species and hence gave the molars as 6 instead 

 of 7. The superior canine is smooth, but the inferior one of the left 

 side has a longitudinal groove on its extero-inferior face. 



Restoration. This carnivore had a large head, with a long, rather nar- 

 row, and truncate muzzle. The limbs were relatively smaller, not ex- 

 ceeding those of the black bear ( Ursus americanus), in length and thick- 

 ness. The tail was long and slender as in the cats, while the claws were 

 broad and flat as in the beaver. 



History, Locality, etc. The teeth are very much worn, indicating the 

 hard food on which the animal had subsisted, as well as its mature age. 



I originally described this species as resembling the remarkable genus 

 Anchippodus* of Leidy, and subsequently (on the Short-footed Ungu- 

 lata of Wyoming, etc., p. 5) have alluded to the large rodent incisor-like 

 teeth as though they were homologous in the two genera. I there 

 identified those teeth in Synoplotherium as canines, adding that they 

 were probably the same in Anchippodus. Having determined the car- 

 nivorous affinities of the former genus, the homology of these apparently 

 similar teeth in the latter becomes problematical. With our present 



* See in Hayden's Geol. Surv. Montana, 1871 (as Trogosus). 



