558 GEOLOGICAL SURVEY OF THE TERRITOEIES. 



Diameter condyle of humerns 047 



Diaiueter shal'r of hnmerus (compressed) 0410 



Diameter condyles of linmeius 0415 



Diameter condyles of liuraerus, (antero-posterior) 032 



Dia meter bead radius, (transverse) 0282 



Diaiueter head radius, (vertical) 01(52 



Diameter shaft radius 016 



Diameter cotylus of ulna, (long) O'AO 



Depth ulna at oorouoid ])rocess 0:54 



Length carx^us and digit 2 without unguis 112 



Leugth two phalanges do o:57 



Length metacarpal do OGl 



Length metacarpal No. 3 074 



Length metacarpal No. 4 070 



Length metacarpal No. 5 0r)3 



Length scaphoid, transversely 023 



Length cuneiform, transversely 027 



Length pisiform 027 



Width pisiform distally OIG 



L<-ngth uuciform, transversely 020 



Wi<lth uucifori^, antero-posteriorly 013 



Width trapezoid, antero-posteriorly , 01.55 



Width trapezium, antero-posteriorly 0114 



Length trapezium, vertically 016 



Width scaphoid, antero-posteriorly 015 



Width navicular, antero-posteriorly 0155 



Length navicular, transversely 02-55 



Length ungueal phalange 016 



Width ungueal phalange 010 



Diameter centrum of lumbar vertebra 029 



Diameter centrum of caudal vertebra 009 



The dental series i.s uninterrnpted from the canine, if, as I believe, 

 tliere is an tdveolus for a simj^le premolar behind it. This I overkjoked 

 when first describing the species, and hence gave the molars as G 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. 



Eestoraiion. — This carnivore had a hirge head, with a long, rather 

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

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

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

 were broad and flat. 



History^ locality, dc. — 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 

 AncMiipodm* of Leidy, and subsequently (ou the Short-footed IJugu- 

 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 SynopJothcrium as canines, adding that they 

 were probably the same in Ancliippodus. 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 Anchippodus resembles that of 

 manj' ungulates, and it is not therefore probably allied to Synoplothe- 

 Hum. 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.) 



