Hyrachyus, Colonoceras, Cesserasictis, Triplopus. 623 
Familia VI. Rhiraoeeirotidae. 
Recognitiones (Virle: Catal., App., 1899, p. 1346). 
1900 - H P Osborn, Plvylogeny of the Rhinoceroses of Europe (Bull. Amer. 
Mus.. XIII, 1900, p. 229-267, 16 fig. in texto). 
1901 Oldf Thomas, Noles on Rhinoceros lasiotis with Hemarlcs on tlie 
Oeneric Position of the liviny Species of Rhinoceros (Proc. Zool. 
Soc. Lond., 1901, p. 154 — 158). 
Subfam. 1. fHyracodontinae. 
1176. f Hyrachyus, Leidy, 1871. 
Colodon, p., Gaudry, 1897. 
Leidy, Proc. Acad. Philad., 1871, p. 229. 
6513. | agrarius, Leidy — (46' 2 4); Osborn, Bull. 
Am. Mus., 1898, p. 81, f. 1, 6, 8, 33. 
6514. -j-filholi, n. nov. 
intermedius, Filbol (nec Scott) - — (472.9 
part .) ; Earle, Amer. Natur., 1898, p. 116. 
6515. t eximius, Leidy — (4625). 
6516. -j- modestus, Leidy — (4626). 
6517. f princeps, Marsh — (4627). 
6518. f implicatus, Cope — (4628). 
intermedius, Scott, Sp. et Osb. (nec 
Filbol) — (4630). 
6519. f imperialis, Scott, Sp. et Osb. — (4629). 
6520. fparadoxus, Scott, Sp. et Osb. — (4631). 
6521. -|-zeilleri, Filhol — (4634). 
f Eocaen. Med. 
Wyoming, Ctah. 
f Eocaen. Europa, 
Gallia. 
f Eocaen. Wyoming. 
f Eocaen. Wyoming. 
f Eocaen. Wyoming. 
f Eocaen. Wyoming. 
f Eocaen. Wyoming. 
f Eocaen. Wyoming. 
f Eocaen. Europa, 
Gallia. 
1177. f Colonoceras, Marsh, 1873. 
Marsh, Amer. Journ. Sc., V, 1873, p. 407. 
6522. f agrestis, Marsh — (4635). f Eocaen. Wyoming. 
1178. -j- Cesserasictis, Filhol, 1887. 
Filhol, Bull. Soc. Philom., XII, 1888, p. 58. 
6523. f antiqua. Filhol — (4636). 7 Eocaen. Europa, 
Gallia. 
1179. -j- Triplopns, Cope, 1880. 
Cope, Amer. Natur., 1880, p. 383. 
6524. t cubitalis, Cope — (4637). f Eocaen. Wyoming. 
