J?86 EXf iNCt MAMMALIA OF NORTS AMERICA. 



canine and anterior two molar teeth. It also retains the socket for the other canine 

 and those of the incisors, one of which is likewise preserved. 



The specimen indicates a rather larger animal than the largest living Peccary, or 

 than Platygonus compressus. The face in advance of the molars is prolonged to a 

 greater degree than in either of those animals, but is proportionately narrower. 



The two premolars retained in the specimen are blunted from wear. They are 

 constructed more nearly after the pattern of those of the living Peccaries than after 

 those of Platygonus. 



The crown of the second premolar is composed of four principal conical tubercles, 

 which alternate in position with a median, fore and aft row of lesser tubercles. The 

 anterior and posterior of the latter replace the basal ridge in a corresponding position 

 in the living Peccaries and in Platyyomis. 



The crown of the first premolar is constructed on the same plan as the second, 

 but is more rudimental in character. 



The incisors hold the same relative position as in Platygonus and the recent Pec- 

 caries, but as indicated by the alveoli, appear to have been comparatively feeble 

 organs. The alveoli are circular, and the anterior pair are but little larger than the 

 posterior ones. 



The upper canine tooth has the same form and mode of insertion as in Platygonus 

 and the recent Peccaries, but is smaller, absolutely and relatively. 



The arching ridge of the canine alveolus, extending upon the premaxillary and 

 bounding a recess for the accommodation of the inferior canine, is almost as high as 

 in Dicotyles labiatus. 



The bones entering into the constitution of the fossil fragment, the maxillaries, 

 premaxillaries, the vomer and a small portion of the nasals are all completely co- 

 ossified. 



The anterior ends of the co-ossified premaxillaries project to a much greater degree 

 in advance of the incisors than in Platygonus and the recent Dicotyles. They are also 

 more truncate, and on each side of the intermaxillary notch are impressed with a 

 conspicuous pit, apparently for the attachment of a pair of muscles, intended for a 

 more mobile and longer snout than is possessed by the living Peccaries, or than 

 existed in Platygonus. 



The incisive foramen holds the same relative position as in the latter animals. 

 The palatine canals open into a groove within the position of the second premolar, 

 and the groove continuing forward becomes hardly perceptible within the position of 

 the canines. 



The hard palate, as in Platygonus, is not so rough as in the living Dicotyles, but is 

 widely and rather deeply grooved along the middle, extending from the position of 

 the molar teeth to the incisive Ibramina. 



