iVo.l.] COPE ON MIOCENE FAUN^ OF OEEGON. 67 



in the incompleteness of the trochlear keel of the metapoclials, and the 

 trenchant character of the premolars, excepting the last. 



The species of the preceding list which I have observed in other locah- 

 ties are the following, which I procured in the White Eiver beds of 

 Eastern Colorado: Falcvolagus haydenij Cams hartsliornianus, Ganw 

 UpXilncotfkmus, Canis gregarhis, Lejytomenjx evansi, Hypertragidus oal- 

 carafus. Professor Leidy has recognized a number of species as those 

 previously found in the White Eiver beds of Dakota by Dr. Hayden. 



Lou}) Forlc Fauna. 



Two new species were obtained by Mr. Sternberg at this horizon, 

 which present characters of considerable interest. They are as follows: 



LUTEICTIS? LYCOPOTAMICUS, Sp. UOV. 



. This Carni^'ore is represented by a left mandibular ramus, which con- 

 tains alveoli and crowns of the canine and molars, excepting those pos- 

 terior to the sectorial. These teeth have the formula, four premolars, 

 of Mustela and of the Dogs, but the sectorial is much more like that of 

 Lutra than that of either of the genera named. The heel of this tooth is 

 long, and encloses a wide space transversely, while the sectorial portion 

 is short and low, and includes a large internal tubercle. In the absence 

 of the tubercular, teeth, the generic reference is uncertain; but its char- 

 acters agreeing, so far as they go, with the genus LutrwMs of Pomel, I 

 refer it there pro\isionally. 



The first premolar only is one-rooted; the third is wide behind, develop- 

 ing a low heel. The heel of the fourth is a little better developed, and 

 there is a small anterior basal cutting lobe; there is also a tubercle on 

 the posterior cutting edge at the middle. The three cusps of the anterior 

 part of the sectorial tooth are situated at the corners of an imaginary 

 equilateral triangle. The heel continues the width of the crown, is 

 wider than long, and is abruptly truncate behind. It supports a long 

 cutting edge just within the external border, and a shorter one on the 

 internal. The surface of the enamel is smooth. There are two mental 

 foramina, one below the interval between the first and second premolars, 

 the other beneath the anterior root of the third premolar. 



Measurements. 



Length of molar series withotit tubercular 0. 0220 



T.- A. jy , . , ( autero-posterior 0.006G 



Diameter of sector] al< v.wuu 



{ transverse 0.0040 



Length of heel of sectorial '. 0.0024 



Length of fourth i^remolar 0.0045 



Elevation of fourth i^remolar 0.003G 



From the Loup Fork formation of Cottonwood Creek, Oregon; dis- 

 covered by Charles H. Sternberg. 

 Peotolabis transmontanus, sp. nov. 



A nearly complete cranium, without lower jaw, of an adult animal, is 



