CAENIVOEA. 
301 
short-crowned; triturating-siirface sigmoid. The apices of the sigma on 
the inner side tubercular, and anterior to the outer apices. First molar 
with an additional transverse crest in front. Incisor compressed; outer 
angle of enamel face rounded, smooth. Molars series oblique, rising 
anteriorly. 
Length of the molar series. 0.0050 
Length of the first molar .. -... 0.0018 
Depth below the last molar (inner side).-... 0.0030 
Depth below the first molar.. . .. 0. 0045 
Depth of the incisor... 0.0015 
Depth at the diastema. 0.0027 
This Mouse is only two-thirds the size of the E. elegans, and of more 
slender proportions. 
The superior incisor tooth of a fourth species of Rodent was obtained. 
It is compressed, resembling those of the Muridce^ and particularly those of 
the Eumys elegans. It is twice as large as that of the E. loxodon. 
CARNIYORA. 
CANIS, Linn. 
I procured remains of four species of Dogs in the Santa F^ marls 
each one represented by a single mandibular ramus. Only one of these is 
identifiable with species of the Loup Fork beds of Colorado and Nebraska, 
and I cannot distinguish its lower jaw from that of the existing Wolf, 
although it must be added that my specimen is imperfect. Eleven species 
of the genus Canis are now known from the North American Tertiaries, 
which range from the size of a Weasel to that of a Bear. I enumerate 
them in the order of size, adding also their stratigraphical position. 
C. osoruni, Cope, White Eiver horizon, Colorado. 
C. gregarius, Cope, White Eiver horizon, Colorado. 
C. Uppincottianus, Cope, White Eiver horizon, Colorado. 
G. vafeVj Leidy, Loup Fork beds, Nebraska. 
C. temerarius, Leidy, Loup Fork beds, Nebraska. 
C. hartshornianus, Cope, White Eiver beds, Colorado. 
C. lupus, L. ( G.scevus, Leidy), Lonp Fork beds, Nebraska, Colorado, and New Mexico. 
C. wheelerianus, Cope, Loup Fork beds. New Mexico. 
C. dirus, Leidy, Quaternary, Mississippi Yalley and ? California. 
G. ursmus. Cope, Loup Fork, New Mexico and ? Colorado. 
G. haydenU, Leidy, Loup Fork, Nebraska. 
