484 The Creodonta. | [ May, 
root. None of the species exceeded the gray fox in size, and the 
Bridger species at present known, are much smaller. 
Didymictis has a greater range in time than Miacis. Eight 
species have been described, two of which are from the Puerco 
horizon and six from the Wasatch. The genus is probably rep- 
resented by other species in the Bridger. There are three divi- 
sions of the genus. In the first the premolars are not lobed on 
their posterior margins ; here belong D. primus and D. haydeni- 
Fig. 28. Fig. 29. 
Fic, 28.—-Mia er a ono is ' Cope, eae mo ar ramus, two-thirds natural size. 
Fig. B eh side; side; c, fro From the Wasatch beds ds of the Big 
Hor 29.— mess mittee Cape, left “mandibular Minis ye emil 
pes a. from the Big Hor r, Wyoming. Fig. a ie 
side; ¢, superior view. Oyicinal, ioe the Report U. S. 
Ill. 
anus (Fig. 30) of the Puerco. The others have the lobes in 
tion, but two of them, D. curtus Cope, and D. massetericus 
ques 
Cope 
g. 39. from the Wi 
Fic. 30. "CEN dna gene PAR, natur. ral size; HMO se: b 
the Big Horn, Wyoming. Fig. æ, external sides K internals ; 
Figs. d. ¢, 7, Didymictis  ovdenianta Cope, jaw 
tion of New M maxillary bone sre "teeth 
mandibuli, ne side; 1 pi ‘from above. All original, 
Geol. Survey, Terrs., F. V, Hayde n in charge, Vol. 111 hile hat% 
: r, W 
(Fig. 29), have a short subcircular tubercular molar, 
