[902.] 



Matthew, New Miocene Canidoe. 



289 



and characters the second lower molar is very like that 

 figured by Dr. Schlosser in ' Palaeontographica ' and referred 



1-/1/ 



J S i 



me' 



Fig. 4. Amphicyon sinapius. 

 Lower carnassial x. § No. 0357. 

 Fig. 3. Amphicyon sinapius . Crown view of Loup Fork (Pawnee Creek Beds), 



nil in jaw, x ?. Type, No. 9338. Colorado. 



doubtfully to A. major. Without more complete material 

 the position of this species cannot certainly be determined. 



? Dinocyon (Borophagus) maeandrinus {Hatcher), 

 .^lurodon mceandrinus Hatcher, Amer. Nat. 1893, 240. 



The type consists of part of a lower jaw, with the second and 

 third premolars greatly worn, and roots of fourth premolar 

 and sectorial. It differs from other ^lurodons, according to 

 Mr. Hatcher's description and figure, in the much greater size, 

 extremely short jaw, and reduced premolars, large posterior 

 root to the sectorial. All these characters point to the Am- 

 phicyoninae rather than to the true dogs; the second molar, 

 whose proportionate size would make the position of the 

 species certain, is unfortunately not indicated in the type. 



To this species may be referred provisionally Am. Mus. No- 

 10583, a fragmentary lower jaw with roots of the teeth, asso- 

 ciated with parts of tibia, etc., found by Mr. Gidley of the 

 American Museum Expedition of 1899 in the Loup Fork forma- 

 tion of Donley Co., Texas. 



Measurements. 



Type. 103S3 



Post-canine diastema 19 14 



Premolar dentition 60 62 



Carnassial, length 47 47 



Second molar — 24 



Carnassial, width ant. root — 15 



" " post. " — 20 



Depth of jaw behind P4 55 69 



[September, 1902] 10 



