SUPPLEMENTARY NOTE TO THE MONOGRAPH OF THE 
LEPORIDZE. 
EXTINCT AMERICAN HARES.* 
Some half dozen species of extinct Hares have been described, mainly 
from the Miocene deposits of Dakota and Colorado. As they are at present 
known merely from a few jaw-fragments and detached teeth, little more can 
be said of them than that they were animals of rather small size, and belonged 
to the family of the Hares. Their true character and relationships can, of 
course, be understood only by the study of much additional material. 
Genus PALAZOLAGUS Leidy. 
Paleolagus Lripy, Proc. Acad. Nat. Sci. Phila., 1856, 89.—Corr, Ann. Rep. U. S. Geol. Surv. Terr. for 
1873 (1874), 477. 
Pricium Corn, Palzxontol. Bull. No. 16, £873, 4. 
Dr. Leidy has described a single species from the Miocene deposits of 
Dakota, and Professor Cope bas made known allied forms from deposits of 
the same age in Colorado. Our knowledge of these forms rests on fragments 
of the jaws, and is hence very imperfect. The dental formula is the same 
as in Lepus, but the molar teeth differ somewhat in constitution. A single 
species of this genus has been described by Dr. Leidy, and three others by 
Professor Cope. 
PALAZOLAGUS HAYDENI Leidy. 
Palewolagus haydeni Lewy, Proc. Acad. Nat. Sci. Phila., 1856, 89; 1857, 89; Journ. Acad. Nat. Sei. Phila., 
2d ser., v, 1869, 331, 404, pl. xxvi, figs. 14-20; U.S. Geol. Survey of Wyoming, 1871, 363.— 
Corr, Ann. Rep. U. S. Geol. Survey of Terr. for 1873 (1874), 473. 
Tricium avunculus Core, Paleontol. Bull. No. 16, 1873, 4. 
“ Tricium anna Core” (see Ann. Rep. U. S. Geol. Survey of Terr, for 1873 (1874), 478). 
This species is known only froma considerable number of fragments of 
upper and lower jaws with teeth, collected by Dr. Hayden from the Miocene 
*Having decided, since the foregoing pages were put in type, to include in these monographs notices 
of the extinet species, as well. as of the existing ones, this supplementary note is added to the Mone- 
graph of the Leperide. 
279 
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