EXTINCT MAMMALIA OF NORTH AMERICA. 



387 



The upjjer part of the nose appears not to have been quite so broad as in Dicoti/les 

 lahiatus, but the nasals appear to have been prolonged at their fore-part, as in that 

 species. 



The measurements of the specimen, compared with those of Platygonus and the 

 two living Peccaries, are as follow : 



D. nasatus. D. tonjuatus. D. labiatus. Platygonus. 



From first premolar to front of preraaxillaries, 



From first premolar to canine alveolus, 



Length of jaw in front of canines, 



Breadth outside of lateral incisors. 



Breadth outside of canine alveoli, 



Narrowest part of interval back of canines, 



Height from palate back of incisive foramina to upper 



part of nasals, . 

 Height of arch of canine alveoli, 

 Ant.-post. diameter first premolar. 

 Transverse " " 



Ant.-post. diameter second premolar, 

 Transverse " " 



Ant.-post. diameter at base of crown of canine. 

 Transverse " " " 



Transverse diameter ant. incisive alveoli, 

 Transverse diameter post. " 



Mr. Timothy Conrad has recently submitted to my inspection the crown of a second 

 molar tooth obtained by Dr. P. Knieskern, from a supposed miocene formation of 

 Shark River, Monmouth County, New Jersey. 



The molar bears nearly the proper relation of size with the premolars in the speci- 

 men above described of DicotijJes nasutus to belong to the same animal The crown 

 has a strong basal ridge, hardly interrupted at the most prominent portion of the 

 lobes externally and internally. The lobes present the same form and relative posi- 

 tion as in D. lahiatus. They are considerably worn, exhibiting on their summits ex- 

 posed tracts of dentine ; nearly circular on those external, and larger and irregularly 

 reniform on those internal. The measurements of the tooth, in comparison with 

 the corresponding tooth of other species, are as follow : 



Lines. 

 ant. post. diam. ^\ 



Fossil tooth, 

 Dicotyles labiatus, 

 Dicotyles torquatus, 

 Platygonus compressus, 



Dicotyles 



7 

 6i 



Lines, 

 trans. 8} 

 " 6J 

 " 5J 

 " 61 



See page 200, PI. XXVni, Fig. 3. 

 Sands of the Niobrara River. Pliocene ? 



