HYSTRICIDH—FOSSIL SPECIES. 397 
TABLE IV.—List of specimens of ERETHIZON DORSATUS var, EPIXANTHUS. 
° q a 
: E a | E 
A we | 2 3 
5 se] 8 a Ticats When From whom re- a 
3 aa A le ocality. Collected by— tc 
S| gat |e ‘hs collected. ceived. =) 
Sep ee EL & 
2 / £2) 2 | 5 : 
3) iS) Oo |a A 
PaaseSeq| | oeseos 1598 | © | Yukon, month of Poren- |...--..--..-..] R, Kennicott......| R. Kennicott......| Skin. 
pine. 
Seems 6528 | 281]... | Fort Yukon Beso E Co seocde| aoe Gbensescocascod|| t)at¥l 
nececocecensncnees| HoCoSsskescsced BoadiO neccoaseccoce Fast) Sesscocdasccs .---do. 
Baceily 
pase dO 
See alOy 
pees 00s 
S200; 
. do. 
P ant ees 
=A G25Gi Peers. ae | sone GO) Aa: sod coacacn6cs| Socassccecsged Boon BEE he ceeechee nes Seti 
sos tase 12405 |......| 9 | Henry’s Lake, Idaho. ...| Aug. 10,1872] Dr. F. V. Hayden | C. H. Merriam ....|..-.do. 
3795 | 3657 |.-..-.|.-- Fort Bridger... . Stoel ..| Dr. F. V. Hayden.) Skulland skin. 
CEeRRS 11631 |......]... | Wyoming ...--- sce 5 eleseiOnecnss ceerees  KOUE 
Soccoen BOOT Reece eee | aero Ome ease a tase ty |uae secicse cae es{nas (U0! 20> wacneeecier!| -a= (O0)at nse esesmee| ome G0. 
12025 | 13978 |......| 9 | Three Buttes, Mont..-. | Aug. 31,1873 | A.Campbell ------ Dr. E. Coues..-..-.. Skull and skin. 
12024 | 13977 |....-. OD | anwar GM gnosqHeasaseeiese PA eed L873) isin) -tolmein'nlnlne == eset) -aeeseseescca --=-d0; 
1S97i|! 2595: |22.--- co | Republican Fork, Kans .| Oct. 7, 1856] Lieut. F. T. Bryan.| W.S. Wood...---. .---do, 
Testi) Bai | [ARs ell Be ee GMigseasceeaneceaos Oct) .7, 1806)|22--d0.....-—- wesee| nee COs ence crtceses- peed. 
peenbos 4269 |......|....] Nebraska ......-.----...|..----.-------| Dr. F. V. Hayden.| Dr. F. V. Hayden-| Skull. 
B40 | GoOtl hess (bo: Fort Whipple, Ariz ...-.|.....----.---. Dr. E.Coues .-...-- Dr. E. Coues...-- Skull and skin. 
Bites) | 1 ipa ea a Bill Williams’s Fork, N. |..-....-....-- Capt Ac. Wihip-||secscncasce-tcee ten e- seattle 
Mex. ple. 
*2264 | ....-- 1704 |....| Percy, Wyo Rocky Mt. Exped .| J. A. Allen......-. Skin. 
*2865) || <==... Uist eesteaee LY 35 cen dee se ceed baacesecosctod boss OW sressacteeecs asad erceesse=cecs SSEcGs 
* In the Museum of Comparative Zodlogy, Cambridge, Mass. 
EXTINCT NORTH AMERICAN PORCUPINES. 
Two forms of extinct North American Porcupines have thus far been 
indicated, described in each case from detached teeth. Hence their relation- 
ship to the existing species is very imperfectly known. 
Dr. Leidy has described* a species from two detached molar teeth, dis- 
covered by Dr. Hayden in the Pliocene deposits of Dakota, which he refers 
to Hystriz, under the name Hystrix venustus. Of these teeth, Dr. Leidy 
says: “They apparently indicate a species of Porcupine, but in structure are 
unlike those of the recent American Porcupine, Evrethizon dorsatus, and ex- 
hibit a more evident relationship with those of the Crested Porcupine, Hystriz 
cristata of Europe.” As is well known, the genus Hystriz belongs to a very 
different group from the Porcupines of the New World, and has not been 
* Journ. Acad. Nat. Sci. Phil., 2d ser., v, 1869, 343; U.S. Geol. Survey of Wyoming for 1870 (1871), 364. 
