256 DOUGLASS — FOSSIL MAMMALIA 



pidatus. The distance from the apex of the paracolic to the apex of the metacone is 

 I lie same distance as from the latter to the apex of the hypocone. 



There are at least two infraorbital foramina. They open in a concavity in the face 

 above the third and fourth premolars. 



From Toston beds near the Missouri river, above Townsend. 



Measurements. 



M. 



Length of last three premolars and first molar (1407 



Length of I' 2 at base 009 



Width of P* at base 012 



Lengl b of Pi '. 0115 



Width of P* 0173 



Length Of I* ■' 012 



Width of P- 1 0182 



Lengl b of M ' 0145 



Height of Infraorbital foramina above alveolar border 018 



Distance between the two Infraorbital foramina exposed 0065 



Colodon, sp. 



No. 63. 



A last upper molar in a fragment of the maxillary. 



This is larger than C. dakotensis. The tooth is considerably worn. The parastyle 

 is as large as the paracolic and is more convex on the outer surface. The metacone is 

 small. From Toston beds. 



Measurements. 



Length of M :: 

 Width of Mi 



M. 



.020 



.022 



Bathygenys, gen. nov. (Plate IX, Figs. 7 and 8.) 



Type Nos. 48 and 66. 



Among the remains of small animals that were found in the Pipestone beds are two 

 portions of mandibles that are of much interest, as, disregarding size, they are so very much 

 like the corresponding parts of some of the Loup Fork specimens from Montana, that I 

 have put in the genus Merycochcerus (1900 and 1901). I have not made a, careful study 

 and comparison, but since seeing the fine specimens of Merycochcerus in the American 

 Museum of Natural History, I think it is very likely that the Montana forms above 

 referred to should be put in a new genus, so I will at present refer these to Merycochcerus 

 with a question mark, as : Merycochcerus (?) laticeps, M. (?) altiramus, etc. 



