034 



MONOORAPnS OP NORTH AMERICAN RODRNTIA. 



PAIJAMYS ROHUSTUS JIarsli. 



J'arauiiji rahunliis Maiisii, Aiiii^r. .lourii, Sci. ami Arts, iv, 1872, 218. 



One of tlic largest of tlio known species of Parnmys, being "somcwlint 



liirgcr than the common AVoodehuck {Arctomys moiiax Gmel.)". Described 



b)' Professor Harsh from "two lower molars" and "other less important 



remains". Lower Tertiary deposits of Grizzly Biittes and Henry's Fork, 



Wyoming. 



PARAMYS LEPTODUS Cope. -' * 



/•rtinmi/s tqtlodin CorE, Pal. Hull. no. 12, 1873, 3. 



"About the size of P. delicatux Lcidy, and P. rohustus Marsh, but with 

 smaller incisors, which have little more than half tiie diameter of the same 

 tooth in tliose 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." Iicngth of the molar series 221"""; antero-pos- 

 terior diameter 38""" ; transverse 24"'"'. Described from a right mandibular 

 ramus with all the teeth preserved. Soutii Bitter Creek, Wyoming. 



PARAMYS DELICATUS Leidy. 



Paramys gelicalua Leidy, Proc. Acad. Nat. Sci. Pliila. 1871, 2I!1 ; Ann. Rep. U. 8. Geol. Surv. Terr, for 1871 

 (1872), 357; Extinct Vert. Fnnna (Final Kcp. U. S. Geol. Surv. Terr. vol. i), 1873, 110, 335, 

 pi. vi, iigs. 23-25.— Cope, Pal. Bull. no. 12, 1873, 4. 



Size about one-fourth less than Arctomys monax. 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 tlie lower jaw, containing most of 

 the molars and portions of the incisors". 



PARAMYS DELICATIOR Leidy. 



Paramtjt delicatior Leidy, Proc. Acad. Nat. Sci. Phila. 1871, 331 ; Ann. Eep. U. S. Gool. Snrv. Terr, for 1871 

 (1872), 357; Extinct Vert. Kanna, 1873, 110, 335, pi. vi, flgg. 2fi, 27, pi. xxvii, flga. 16-18.— 

 Coi'K, Pal. Dull. DO. 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 ; antcro- 



