1 38 Bulletin American Museum of Natural History. [Vol, XVI, 



make the identification reasonably safe. No other Musteline 

 is known from the White River. 



The characters of the skull confirm the views expressed by 

 Cope and Schlosser as to the position of the genus. It is 

 PalcBogale with a minute second molar still retained. It be- 

 longs to the primitive division of the Mustelinae, with tri- 

 angular first molar, no posterior flange on the protocone. 

 The carnassial is primitive in character, somewhat resem- 

 bling that of Cynodictis gregarius, the protocone very large, the 

 shear more oblique than in modern Mustelinae, less so than in 

 Cynodictis, the fissure between protocone 

 and postero-external blade still quite well 

 marked. There is a small antero-internal 

 basal cusp and a less marked antero-ex- 

 ternal one. The second and third pre- 

 molars are of moderate size without 

 trittocones, much higher than in Mustcla, 

 higher and proportionately larger than in 

 Pntorius. The first premolar is a single- 

 rooted tooth of small size ; first and second 

 premolars are spaced. Alveoli of canines, 

 of moderate size, are preserved. 



The bullae are of primitive character, 

 inflated, short and prominent, instead of 

 flattened and elongated as in Mustela and 

 Pntorius. The palate extends backward 

 only to opposite the anterior edge of the 

 first molar, while in modern Mustelines 

 it extends considerably behind the teeth. The shorter bullae 

 leave a much larger surface of the sphenoids and occi- 

 pitals exposed ; the short stout paroccipital process is entirely 

 free of the bulla. The occipital and sagittal crests have the 

 same outlines as in Pntorius ermincus, but the posterior lobes 

 of the brain are separated from the cerebral lobes by a strongly 

 marked depression; the arches are much heavier, muzzle 

 much longer, resembling that of Mustcla more nearly, but 

 flatter, longer, more slender toward the tip ; infraorbital fora- 

 men smaller, postorbital process of the frontal less prominent. 



/"••' 



Fig. 2. 



m2 

 Crown View of 

 Teeth. 



