220 OTOTYLOMYS. 



4(>. Ototylomys. 



T 1-I - M 3 ~ 3 T 6 

 1 'i-i 1V1 '3-3~ 



Ototylomys Merr., Proc. Wash. Acad. Scien., in, 1901, p. 561. 

 Type Ototylomys phyllotis Merriam. 



Rat -like; ears large, thin, and naked; tail long and naked. Skull: 

 superciliary ridge present and reaching to occiput; bullae with axes 

 parallel to that of skull; width and depth equal, and no anterior 

 prolongation ; maxillary root of zygoma notched above ; anterior open- 

 ing of antorbital vacuity vertical ; incisive foramina equal in width at 



FIG. 37. OTOTYLOMYS PHYLLOTIS. 



No. 10809$ U. S. Nat. Mus. Coll. Enlarged X. 



UPPER TOOTH ROW. LOWER TOOTH ROW. 



Enlarged 7 times. Enlarged 7 times. 



