SUBORDER B 



FISSIPEDIA' 



63 



Temnocyon Cojoe. Upper M triangular in outline, talonids of lower molars 

 trenchant. John Day beds (Miocene) ; Oregon. T. altigenis, supposed 

 ancestor of Cijon. 



Mesocyon Scott (Hypofemnodon Eyermann). Talonid of M^ trenchant, M^ 

 and M^ basin-shaped. M. coryphaeus Cope sp. Same horizon and locality 

 as the preceding. 



Cynodictis Bravard and Pomel (Fig. 89). f M. Upper molars very 

 broad, triangular, with two rounded external cusps, and crescentic inner cusp. 

 Lower carnassial with high external and strong internal cusps, talonid large. 

 ^ C. lacustris Gervais ; C. intennedius Filhol. Gypsum 



beds of Paris ; D6bruge ; also Quercy Phosphorites. 



Galecynus Owen {Cynodictis Wortman). Upper 

 molars triangular in outline, rounded ; P* short. 

 Oligocene. G. paterculus Matthew sp. G. gregarius 

 Cope. White Kiver beds. G. oregonensis Merriam sp. 

 John Day beds. G. oeningensis von Meyer. Upper 

 Miocene ; Europe. 



Cynodictis lacustris Gerv. Upper Eocene ; Phosphorites of Quercy. A, Fragment of riglit upper jaw. 

 i>, Internal aspect of right mandible, i/i- 



Nothocyon Matthew {Galecynus Cope). Upper molars large, upper carnassial 

 small. Lower molars with well-developed hypoconid. N. geismarianus 

 Cope sp., John Day beds. N. annectens Peterson, with larger carnassial, 

 from the Lower Miocene of Nebraska, is regarded as ancestral to existing 

 South American Canidae. 



Cynodesmus Scott. M resembling those of Lupus, P with high cusps and 

 secondary tubercles. Extremities pentadactyl, hallux abbreviated. C. thooides 

 Scott. Miocene, Montana. 0. thomsoni Matthew. South Dakota. 



FMlothrax Merriam. Jaw short and stout ; premolars three in number. 

 F. condoni Merriam. John Day beds, Oregon. 



Subfamily 2. Amphicyoninae. 



3-2 



— M. Upper carnassials short and usiially thickened, having an inner 



tubercle which may be either broadened anteriorly or displaced towards the median 

 line ; remaining P mostly small and simple. M^ rounded, triangular, or quadrate 

 in outline, with well-developed cinguhim internally, generally also externcdly ; with tiro 

 anterior conules, and one, less often two, inner tubercles ; median tubercles may be 

 present. M^ and M^ oval. M^ often wanting. Lower molars with small metaconid, 



