Equus occidentalis. E. giganteus? Mylohyus? sp. indet. Procamelus coconinensis. P. longurio. Antilocapra americana? Marmota arizonæ. Citellus tuitus. Neotoma cinerea. Lepus benjamini. Brachylagus browni. Taxidea robusta. Canis nubilus? C. latrans? Chasmaporthetes ossifragus. The writer believes that this assemblage of mammals must be referred to the Pleistocene. It will be noted, however, that there are two species of the genus _Procamelus_. These resemble so much two species, _P. major_ and _P. minimus_, described by Leidy and Lucas (Trans. Wagner Free Inst., vol. IV, pp. I-XIV, 15–61) from the Alachua clays of Florida, that it seemed at first necessary to identify them as such. The genus _Procamelus_ seems, therefore, to be brought definitely into the early Pleistocene, probably the Nebraskan. The collections made in the Alachua clays in Florida were obtained in Alachua and Levy counties. On pages 195 and 375 will be found an account of the geological conditions under which the fossils were found, and lists of the species. The essential features are that such supposed Miocene or Pliocene genera as _Gomphotherium_, _Procamelus_, _Teleoceras_, and _Aphelops_ were found associated with the Pleistocene genera _Odocoileus_, _Tapirus_, _Megatherium_, and _Equus_. This has been explained on the theory that the clays are of Tertiary age and that the Pleistocene species had become mingled with those of an earlier time. At a number of places in Florida where phosphate rock has been mined there have been secured similar associations of early camels, rhinoceroses, horses (_Hipparion_, _Parahippus_) with genera belonging undoubtedly to the Pleistocene. This has occurred so often that the writer doubts the correctness of the explanation given. He ventures, therefore, to include in the Pleistocene of the Nebraskan stage the various deposits that have received the names Alachua clays, the Dunnellon formation, and Bone Valley formation. The latter, called also the land-pebble phosphates, is believed by Sellards to be contemporaneous in age with the Dunnellon or hard phosphates, but to have accumulated under different conditions. Both the Alachuan and the Bone Valley formations were referred by Sellards to either the late Miocene or the early Pliocene, with an evident preference for the latter. It seems to have been the presence of the rhinoceroses that most influenced him in his assignment of the deposits; but there were naturally other considerations. He wrote: The presence of rhinoceroses in the formation is believed to establish definitely the fact that the beds can not be later than the early Pliocene, since rhinoceroses in America apparently did not survive beyond that time (Fla. Geol. Surv., vol. VII, p. 73).