PETERSON : NEW CARNIVORES FROM MIOCENE OF WESTERN NEBRASKA 2H 
Matthew and Gidley doubtfully referred this type to Potamotherium. As this Ameri. 
can form now stands I cannot see that it is much nearer Potamotheriwm than Steno- 
gale as the jaw is deeper in proportion ; it is also somewhat shorter and more ro- 
bust, the symphysis is lighter, the premolars are smaller and M; larger than in the 
former genus, while the latter genus has the under border of the lower jaw very 
much more curved fore-and-aft, the premolars are too large in proportion to the car- 
nassial, the heel of the latter is entirely different in shape, and very much smaller, 
and the tubercles of the teeth are evidently sharper and higher than in the American 
specimen. ‘The latter form should, I think, oceupy a new generic position (Breehey- 
gee) somewhat near the Oligobunis phylum although the premolars are proportion- 
ally smaller than in the latter, especially in the transverse diameter. In Paroligo- 
bunis the jaw is proportionally shorter and heavier, the alveolar border is more 
curved from before backward, the premolars are more crowded, and the carnassial 
has apparently a shorter heel than in the new genus here proposed. 
PPPS pa mie 
ji N X 
Fia. 69. Alveolar Border and External View of Jaw of Brachypsalis pacycephalus Cope. Nat. size. (Cope col- 
lection, No. 8544, Am. Mus. Natural History. ) 
Brachypsalis pachycephalus Cope was proposed (I. ¢., p. 951) on a rather inade- 
quate type, a left mandibular ramus, from the same locality in which Stenogale 
robusta was found. Professor Cope afterwards referred this type to Potamotherium 
of Europe, while Matthew and Gidley (/. ¢., p. 254) accept the type as valid and 
distinct from Potamotherium. Ina former paper* the present writer regarded Paro- 
ligobunis (Brachypsalis) simplicidens as possibly an ancestral form to Brach ypsalis, a 
view which is no longer tenable inasmuch as the latter species has Mz proportionally 
larger, and the carnassial apparently smaller in proportion to the premolars. 
(Compare figs. 64 and 65 with fig. 69.) 
80 Ann. Carn. Mus., Vol. IV, p. 45, 1906. 
Sthenictig 
