934 MONOGRAPHS OF NORTH AMBRICAN RODENTIA. 
PARAMYS ROBUSTUS Marsh. 
Paramys robustus Marsu, Amer. Journ. Sci. and Arts, iv, 1872, 218. 
One of the largest of the known species of Paramys, being “somewhat 
larger than the common Woodchuck (Arctomys monax Gmel.)”. Described 
by Professor Marsh from “two lower molars” and “other less important 
remains”. Lower Tertiary deposits of Grizzly Buttes and Henry’s Fork, 
Wyoming. 
PARAMYS LEPTODUS Cope. 
Paramys leptodus Cork, Pal. Bull. no, 12, 1873, 3. 
“About the size of P. delicatus Leidy, and P. robustus Marsh, but with 
smaller incisors, which have little more than half the diameter of the same 
tooth in those species. The molars have two anterior separate, and three 
posterior contiguous cones, the median smallest. The anterior and posterior 
of both sides separated by a deep excavation. The anterior tooth is peculiar 
in its greater compression. The posterior tubercles are not separated, and 
the anterior inner situate behind the outer, and connected with the posterior 
inner by a concave ridge.” Length of the molar series 221"; antero-pos- 
terior diameter 38™"; transverse 24". Described from a right mandibular 
ramus with all the teeth preserved. South Bitter Creek, Wyoming. 
PARAMYS DELICATUS Leidy. 
Paramys delicatus Lripy, Proc. Acad. Nat. Sei. Phila. 1871, 231; Ann. Rep. U. 8. Geol. Surv. Terr. for 1871 
(1872), 357; Extinct Vert. Fauna (Final Rep. U. 8. Geol. Sury. Terr. vol. i), 1873, 110, 335, 
pl. vi, figs. 23-25.—CopE, Pal. Bull. no. 12, 1873, 4. 
Size about one-fourth less than Arctomys monaz. Length of the lower 
molar series 0.75 of an inch; antero-posterior diameter of the lower incisor 
0.17; transverse diameter 0.13. Eocene beds near Fort Bridger (Leidy), and 
Black’s Fork, Southwestern Wyoming (Cope). Described and figured by 
Dr. Leidy (¢. c.) from two specimens sent to him by Dr. Carter, “‘ consisting 
of portions of the right and left sides of the lower jaw, containing most of 
the molars and portions of the incisors”. 
PARAMYS DELICATIOR Leidy. 
Paramys delicatior Leipy, Proc. Acad. Nat. Sci. Phila. 1871, 231; Ann. Rep. U.S. Geol. Surv. Terr. for 1871 
(1872), 357; Extinet Vert. Fauna, 1878, 110, 335, pl. vi, figs. 26, 27, pl. xxvii, figs. 16-18.— 
Corr, Pal. Bull. no. 12, 1873, 4. ; 
Rather smaller than the preceding, and collected by Dr. Carter from 
the same locality. Length of the lower molar series 0.62 of an inch; antero- 
