CASTORID Aia—EUCASTOR— EUCASTOR 
TORTUS. 449 
TABLE II.—List of specimens examined of CASTOR FIBER var. CANADENSIS—Continned. 
+ | 5 
en ee E 
Sieals |. z 
3 3a 5 & Locality. When From pom aes Collected by— ea 
=] Oey he collected. ceived. S 
2a/ee| 213 2 
a8lon]/ aja 5 
Salas) Bix eS 
Sele 6 | a A 
ferose 3371 |.--.--|.---| Kansas ......-...-......-.| Oct. 2,——]| Dr. F. V. Hayden -| Dr. F. V. Hayden | Skull. 
ee a *412 |......|....| Fort Hays, Kans..........]... Rocky Mt. Exped | J. A. Allen........|....do. 
ihe een aeie| wos ee Od} Fort Cobb, Ind. Ter Dr. E. Palmer...-.- Dr. E. Palmer.... | Skin. 
Ree | eee: | ana ec (oped eer G0) SSehosce see ocsscies dO csssscpecces 3200 seeenccencues - --do, 
peSaee 6315 |------|----| Denver, Colo.-............- Skull. 
NOaHs eeeeten tanemes |p e Fort Chadbourne, Tex ... |.-.. Skin. 
Seece 1414 |.--.-..].--.| Matamoras, Mex..........|...........--.| Lieut. D. N. Couch.| Dr. L. Berlandier | Skull. 
ehiee Pen ete Sete eee Os oe os ate arsine can nae cees tere me ee ec OO) ese cee cce=s = fo 21OO|necnoccese en |-5-500s 
races 1003 |.-----] d¢ | Rio Grande, Tex..-........|.----......--.]| Maj. W. H. Emory.| J. H. Clark........|.-..do. 
Beane 3772 |.-----|----| Franklin County, Miss.-...|.-.-.......--.]| B. L. C. Wailes..-.| B. L.C. Wailes-.-. |..-.do. 
ECA Beet eee em =| MIBSISSIDDH =. ---. <eeec-| ace -cceoe0cs-|| MY. Keenan ...--.-]/ Mr. Keanan.-...-.]:--.do, 
ens Se0Gi == --1----| Oxtord County, Me... --..] 2... <.-.--.1|/S. G. Rich. . J.G. Rich. .....---|.--.do. 
(C3) | PeSecs| HSa S35 eee Seseec (ea poeeeeoeosaand hs dOssasece pe OO ieeteeklnye aca Skin 
See | Hee COs ae aeee =e ee ae do. 
Sai Cd Beeoeeoenl Bees do. 
3 eeecoreason (sa do. 
H. A. Wood..-.-- Skeleton. 
bowses 1072 | --.-.| -. | Saint Lawrence Co., N. Y .|.....-...-----] Dr. Hough .-.. ...| Dr. Hough -..-. -..| Skull. 
See 7392 | -..-.|---.| Lake Superior L. H. Morgan .....| L. H. Morgan ..--.|----do. 
sched 7389 |.--- aarcet Oinsesoeee NRE Roo ndsasc| Seed raceeaosecssed| ps= Gs 
eee oO U eesteeen ens levee OS are aioe em ie Sete ee tet de Oa noe mote acyl ew UO gece s esemw mellem OD, 
peecoe HESS | ec arel hema teas @ Beet ceeeSee see rY HEE Seems! ese (ise se ise seems aaa OMe ertaeer Sty Bert! (ty 
ace idee eee eee PEAR LYON. 82. ces sisc. | aatae cen ale cial -ee einige al ae Saea [Oe -s aeleeee bones ew enifooee OO 
seee-- 6564 |......]....] River Elbe, Germany .....| .-...-.-----.| Prince Maximilian.|-...........-...----|----do.t 
«In the Museum of Comparative Zoélogy, Cambridge, Mass. 
Genus HUCASTOR Leidy. 
EUCASTOR TORTUS Leidy 
Castor (Eucastor) tortus Lerpy, Proc. Acad. Nat. Sci. Phila., 1858, 23. 
+ Variety fiber. 
Castor tortus Lemmy, Journ. Acad. Nat. Sci. Phil., 2d ser., v, 1869, 341, 405, pl. xxvi, figs. 21, 22; U.S. 
Geol. Surv. of Wyoming, 1871, 363. 
This species was first described by Dr. Leidy 
in 1858, from remains 
discovered by Dr. Hayden in the loose sands of the Niobrara River. These 
remains consist of the greater portion of an upper jaw 
, containing portions of 
the incisors and the three anterior molars on each side, and were redescribed 
and figured by him in 1869. This fragment indicates 
an animal smaller even 
than the common Marmot (Arctomys monaz), and hence of much less than 
half the bulk of the existing Beaver. The portion of the jaw described by 
Dr. Leidy “ consists of the under parts of both maxillary and intermaxillary 
bones, which together are the diminished counterpart in form of the corre- 
sponding parts of the recent Beaver. The incisor teeth likewise have the 
29 M 
