64 Annals of the Carnegie Museum. 



Genus Sciuravus Marsh. 

 II. Sciuravus altidens sp. nov. 



Type: Fragment of left maxillary with two cheek-teeth in position 

 and the root of the third. C. M. No. 2348. 



Horizon: Uinta Eocene, Horizon B, near base. 



Locality: Between Bonanza and Kennedy's Hole, Uinta Basin, 

 Utah. 



Characters of Type Specimen: Position of tritocone placed well inter- 

 nally and in line with the deuterocone; the presence of a small meta- 

 conule on M-; a small mesostyle on P-; type specimen representing a 

 somewhat larger animal than Sciuravus nitidus. 



The most noteworthy differences which I am able to find between 

 the present specimen and that of Sciuravus nitidus, illustrated by 

 Dr. Matthew, is that the postero-internal tubercle (tritocone) is placed 

 more internally and more nearly in an antero-posterior line with the 

 deuterocone. There is also in the present specimen a metaconule 

 indicated on M-. This is plainly shown in Fig. 5, and is not indicated 

 in the illustration, or mentioned in the text, of Matthew's paper. 

 The specimen is of about the same, or slightly larger, size than S. 

 nitidus. 



Of this specimen Mr. Gidley has the following to say: "This 

 specimen (No. 2348) is somewhat larger than S. nitidus, and further 

 differs from that species in having the inner row, or rather the inner 



Fig. 5. Sciuravus altidens. Carnegie FiG. 6. Prosciurus Matthew. Carnegie 

 Museum No. 2348. X 3/1. Museum No. 2925. X i/i. 



base of the crown in the upper cheek-teeth, considerably heightened, 

 giving a decidedly bowed outline to the inner walls of these teeth. 

 There is also a small mesostyle on P4 (absent in P4 of S. nitidus), and 

 this cusp is relatively more prominent in the molars than in those of 

 S. nitidus." 



* Outer side of teeth face toward the top of the page. 



