558 GEOLOGICAL SURVEY OF THE TERRITORIES. 



M. 



Diameter condyle of humerus , 047 



Diameter shaft of humerus (compressed) 0410 



Diameter condyles of humerus 0415 



Diameter condyles of humerus, (antero-posterior) 032 



Diameter head radius, (transverse) 0282 



Diameter head radius, (vertical) 0162 



Diameter shaft radius , 016 



Diameter cotylus of ulna, (long) 030 



Depth ulna at coronoid process 034 



Length carpus and. digit 2 M^ithout unguis 112 



Length two phalanges do 037 



Length metacarpal do 061 



Length metacarpal No. 3 .• , 074 



Length metacarpal No. 4 070 



Length metacarpal No. 5 053 



Length scaphoid, transversely 023 



Length cuneiform, transversely 027 



Length pisiform 027 



Width pisiform distally 016 



Length unciform, transversely 020 



Width uuciforis, antero-posteriorly 013 



Width trapezoid, antero-posteriorly 0155 



Width trapezium, antero-posteriorly 0114 



Length trapezium, vertically 016 



Width scaiDhoid, antero-posteriorly 015 



Width navicular, antero-posteriorly 0155 



Length navicular, transversely 0255 



Length ungueal phalange 016 



Width ungueal phalange 010 



Diameter centrum of lumbar vertebra . 029 



Diameter centrum of caudal vertebra 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. 



Eestoration. — This carnivore had a large head, with a long, rather 

 narrow, and truncate muzzle. The limbs were relatively smaller, not 

 exceeding those of the black bear {Ursus americanus) in length and 

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

 were broad and flat. 



History^ locality^ &c. — 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 

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

 lata of Wyoming, &c., 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 Synoplotlierium 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 

 knowledge, the type of molar teeth in Ancliippodtis resembles that of 

 many ungulates, and it is not therefore probably allied to SynoplotJie- 

 rium. Nevertheless, it is not yet certain that the teeth in question are 

 incisors, and that the genera are in nowise related, though a similar 

 modification of a remarkable character in distinct but coexistent types 

 is by no means an unprecedented circumstance. 



The remains on which the above identification is based, were found 

 by the writer on a terrace of the Mammoth Buttes, near South Bitter 



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



