946 THE WHITE EIVEE FAUNA. 



BUN^LURUS Cope. 



Synopsis of the New Vertebrata of Colorado, 1873, p. 8. Annual Report United Statea Geological 

 Survey Territories, F. V. Hayden, 1873 (1874\ p. 508. 



The specimens from which this genus is known exhibit a part of the 

 inferior dentition only, so that the number of premolars is unknown. It is 

 probable that there are four premolars however, and there are two true 

 molars, the first of which is sectorial. 



The sectorial tooth is like that of Putorius. It has no internal cusp, 

 and has a well developed blade. It has also a well developed heel, which 

 has a trenchant median keel. Tubercular molar one, with a median cutting- 

 edge. 



Tliis genus probably belongs to the Mustelidoe, and is allied to Putorius, 

 and perhaps to Gulo. It is not probable that it has the reduced number 

 of premolars of the former genus, but is more apt to agree with the latter 

 genus, and with Plesiogale Pom. in its formula. I have even referred to it 

 under the name of Gulo,^ from which Plesiogale ^ has never been really dis- 

 tinguished. The form of the tubercular tooth is, however, very peculiar, 

 and is different from what is seen in any of the species of the genera last 

 named. Structurally the term tubercular does not apply to it, as it is a 

 cutting tooth, without cusps or tubercles. An apjjroach to this form is 

 found in Putorius, but in Galictis the tubercular molar is of the ordinary 

 ty|De. I know but one species of Bimcslurus. 



Bun.s;lueus lagophagus Cope. 



Synopsis New Vertebrata Colorado, 1.S73, p. 8. Annual Report U. S. Geol. Survey Terrs., 1873 (1S74), 



J). 50H. Plesiogale Cope, on plate of the jiresent volume. 



Plate LXVIIa; figs. 13,14. 



This species is represented by parts of the lower jaws of two indi- 

 viduals, one adult, the other immature. The latter is the more instructive, 

 as it presents the third and fourth premolars emerging from the jaw, and 

 the first and second true molars fully protruded. The crown of the fourth 

 premolar is between the roots of the deciduous sectorial, which still remains 

 attached to the jaw. 



' Bulletin U. S. Geol. Surv. Terrs., VI, p. 45. The best description of the dentition of this genus 

 is given by Cones. — The Fur Bearing Animals of America, pp. 39,40, 1877. 



- See Filhol Mammiferes Fossiles de Saint Gerand le Pny, 1879, pp. 177-190, Plato 25, who refers 

 the species to Muatela. 



