NO. 2100. RACCOONS AND THEIR ALLIES— HOLLTSTER. 145 



narrow tube. Mandible short, greatly rounded; ascending ramus 



high, wide, and curved backward; condyles very large. 



.31 32 

 Dental formula. — i kC^ pm ^ m ^ = 38. 



Cheek-teeth large, maxillary row about one-third greatest length 

 of skull; molariform teeth comparatively high crowned, multicuspid; 

 last upper premolar and upper molars much broader than long; 

 pm* nonsectorial. Incisors weak. Canine ovate in section at 

 cingulum, grooved on outer and inner surfaces. Each upper pre- 

 molar with more than one cusp; pm^ with weU developed protocone 

 and hypocone; pm* six-cusped, the protocone and hypocone with 

 the prominent supplementary inner cusp forming more than one- 

 half the tooth; pmi minute and deciduous; permanent lower pre- 

 molars all long and narrow. Upper molars usually with numerous 

 accessory cusplets on outside and on the strongly developed inner 

 cingulum shelf; lower molars with numerous accessory cusplets. 

 (Plate 39.) 



Genus PROCYON Storr. 



1780. Procyon Storr, Prodr. Meth. Mamm., p, 35. 



(Full synonymy under subgenera.) 



Type. — Ursus lotor Linnaeus. 



Characters. — Head broad behind, with pointed muzzle; ears fairly 

 large, pointed; toes all free; claws nonre tractile ; tail shorter than 

 body, nonprehensile ; soles of feet entirely naked; os penis long and 

 slender, about 100 mm. in length, bilobed anteriorly. 



Skull more elongate (less rounded) than in Ailurus, shorter and 

 broader than in Nasua; braincase broad and fiat, with medium inter- 

 orbital constriction; zygomata with distinct postorbital processes, 

 but processes from frontals greatly reduced; sagittal crest moderate 

 or absent. Palate flat or slightly concave, extending considerably 

 beyond plane of last molar, and with barely noticeable lateral 

 grooves; vomer attached to palatal bones; alisphenoid canal absent 

 (as in all succeeding genera); foramen ovale small; postglenoid 

 process small; audital bullae large, greatly inflated on inner side, 

 and not rising at sharp angle above the tube of the external audi- 

 tory meatus. Mandible long, moderately rounded; ascending ramus 

 low and extending backward without a highly arched curve; condyles 

 small. 



Dental formula : i-c r- pm -r m ^ = 40. 



Teeth large (maxiliary row about one-third greatest length of 



skull); molariform teeth comparatively high crowned, with heavy, 



conical cusps; last upper premolar and first upper molar subquadrate, 



only slightly broader than long, or both dimensions about equal; p7n* 



81022°— Proc.N.M. vol.49— 15 10 



