246 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
Myodes, or Arvicola at large, it will be better understood by simply laying the 
different skulls side by side, and looking at the teeth with a pocket-lens. 
Externally, although Cunicudus shares the “lemming” shape of Myodes, 
it is instantly distinguished by the absence of external ears, the shortness 
and dense furring of the feet, the obsolete pollex with rudimentary nail, and 
the prodigious length of the two middle fore claws, whose size is often more 
than doubled by the singular growth already mentioned. As to the absence 
of ears, there is indeed a rim or border around the opening, but it cannot be 
called an auricle. 
We have in America but one species of Cuniculus as far as is known; 
it is identical with that of Northern Asia. Of the relationships of the sup- 
posed second species, C. dagwrus, we can say nothing, having seen no speci- 
mens; but, as already intimated, we believe its validity to be open to question. 
CUNICULUS TORQUATUS, (Pall.) Coues. 
Mus hudsonius, Pactas, N. Sp. Quad. Glirium, 1778, 208, pl. xxvi, figs. A, B, C. (quotes Forster, Phil. Trans. 
lxii, 1772, 379).—GMELIN, Syst. Nat. i, 1788, 137. 
Lemmus hudsonius, SABINE, Suppl. Parry, App. 1824, 185.—SaBuiNe, Franklin’s Journ. App. 1825, 661.— 
Haran, Fn. Amer. 1825, 546, 
Arvicola hudsonia, RICHARDSON, App. Parry’s 2d Voy. 308. 
Arvicola (Georychus) hudsonius, RICHARDSON, F. B.-A. i, 1829, 132. 
Myodes hudsonius, WAGNER, Suppl. Schreber, iii, 1843, 604. —MippENDoRrF, Bull. Acad. Imp. St.-Péter. iii, 
xix.—Wiegmann’s Archiv, 1845, Bd. ii, 34.—Da.t, Alaska and its Resources, 1870, 577. 
Georychus hudsonius, AUD. & Bacit., Q. N. A. 1853, iii, 81, pl. exix. 
Cuniculus hudsonius, Cours, Proc. Acad. Nat. Sci. Phila. 1874, 196. 
Mus torquatus, PaLvas, N. Sp. Quad. Glirium, 1778, 77 and 206, pl. xi, B.—Gm., Syst. Nat. i, 1788, 136. 
Myodes torquatus, KEYSERLING & Buasius, Wirbelth. Europ. 1840, pp. vii and 32.—MippENDoRF?, Sibir. 
Reise, ii, pt. ii, 1853, 87, pl. iv-vii and x.—Batrrp, M. N. A. 1857, 558.—Biackm. & ALSTON., 
P. Z. S. 1874, 469. 
Misothermus torquatus, HENSEL, Zeits. Deutsch. Geol. Ges. vii, 1855, 492, pl. xxv, figs. 12, 13. 
Mus lenensis, Pattas, N. Sp. Quad. Glirium, 1778, 195. 
Mus grenlandicus, TRAILL, Scoresby’s Greenland, 1823, 416.—R1cHarDsoNn, App. Parry’s 2d Voy. 304. 
Arvicola (Georychus) grenlandicus, RICHARDSON, F. B.-A. i, 1829, 134. ; 
Georychus grenlandicus, AUD. & Bacu., Q. N. A. 1854, iii, 315. 
Cuniculus grenlandicus, WAGLER, Isis, 1832, 1220. 
Myodes grenlandicus, WAGNER, Suppl. Schreber, iii, 1843, 606.—Gray, P. Z. S. xvi, 1848, 43, and Rae’s 
Narrative, 1850.—Da 1, Alaska and its Resources, 1870, 577. 
Lemmus ungulatus, BAER, Baer and Helmersen, Beitriige, iv, 1841, 283. 
Hudson's Rat and Hare-tailed Rat, PENNANT, Arct. Zool. i, 1785, 132, 133; Quad. ii, 201. 
Hare-tailed Mouse, HEARNE, Journ. 387. 
Hudson’s Bay Lemming, Auct. 
Wapiskooseesick (“White Bear-Mouse”), Cree Indians.—Lunaguy (“White Mouse”), Chippewayans.— 
Awingnack (“White Mouse”), Esquimaux. (Label of No. 7755.) 
Diacnosis —C. exauriculatus, pollice obsoleto, unguibus digitorum mantis 
34" maximis, bimucronatis, quasi-duplicatis ; pedibus hirsutissimis; caudé 
pedihus breviore ; vestitu estivali supra castaneo nigro et griseo aut luleo varie- 
