SUPPLEMENTARY NOTE TO THE MONOGRAPH OF THE 



LEPORID2E. 



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 PAL^OLAGUS Lcidy. 



Palmolagus Leibv, Proc. Acad. Nat. Sci. Phila., 1856, 89— Cope, Aun. Rep. U. S. Geol. Surv. T«rr. for 



1873(1874), 477. 

 Tricium Cope, Palasontol. Bull. No. 16, 1873, 4. 



Dr. Leidy has described a single species from the Miocene deposits of 



Dakota, and Professor Cope has 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 Lepm, but the molar teeth differ somewhat in constitution. A single 



species of this genus has been described by Dr. Lcidy, and three others by 



Professor Cope. 



PAL^EOLAGUS HAYDENI Leidy. 



ralaolagus haydeni Leidy, Proc. Acad. Nat. Sci. Phila., 1856, 89; 1857, 89 ; Journ. Acad. Nat. Sci. Phila., 

 2d ser., v, 1869, 331, 404, pi. xxvi, figs. 14-20; U. S. Geol. Survey of Wyoming, 1871, 303.— 

 Cope, Ann. Rep. U. S. Geol. Survey of Terr, for 1873 (1874), 478. 



Tricium avunculus Cope, Pakeontol. Bull. No. 16, 1873, 4. 



" Tricium anna; Cope " (see Aun. Rep. U. S. Geol. Survey of Terr, for 1873 (1874), 478). 



This species is known only from a considerable number of fragments of 

 upper and lower jaws with teeth, collected by Dr. Haydcn from the Miocene 



'Having decided, since the foregoing pages were put in type, to include iu these monographs notices 

 of the extinct speeies, as well as of the existing ones, this supplementary note is added to the Mono- 

 graph of the Lcporidm. 



tj4 J 



