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The major purpose of this article was to distin- guish between the species of bait fishes that are utilized along the river, from Lake Mead to Yuma, and to make it possible for bait dealers interested fishermen, fishery biologists, and wardens to identify most of the species sold. 227. Miller, R. R, 1955. Fish remains from archeo- PALEOICTHY. logical sites in the lower Colorado River ENDANG. FISH basin, Arizona. Papers Michigan Academy HISTORY Science, Arts and Letters 40:125-136. DISTRIBUTION COLORADO R. The fish remains collected in 1949, included over 375 bones and bone fragments, well preserved, with a sufficient number of critical bones to permit confident identification of species. Two families of fishes are represented, the suckers Catostomidae, and the minnows Cyprinidae. At least three species were secured, one of which had never been reported from the Colorado River below Grand Canyon. 228. Miller, R. R. 1958x. Origin and affinities of DISTRIBUTION the freshwater fish fauna of western North HISTORY America, pp, 187-222. In: C, L. Hubbs ABUNDANCE (ed,) Zoogeography. American Association FISH for the Advancement of Science, Washington, COLORADO R. D.C. Publication No. 51. Of the 21 families of freshwater fishes inhabit- ing North America, about 30 percent of the species are judged to be of North American origin, 55 percent of Eurasian ancestry, and 15 percent of South American affinities. The absence of a large diverse drainage system, and the general scarcity and instability of the aquatic environment, explain the depauperate western fauna, as compared to the eastern fauna. The western fauna is made up of relicts, an abundance of monotypic genera, and a complex of endemic faunas with few widespread species in common, many of which are restricted in distribution. The fish fauna of the Colorado Basin is the richest and has the highest percent- age of species' endemism (87%) of the seven major western drainages. 95