212 R. R. MILLER 



Snake River above American Falls, into which Lake Bonneville 

 overflowed in late Pleistocene times. Excluded from consideration 

 in the Bonneville fauna, however, are two suckers {Catostomus 

 catostomus and C. columbiamis) known from the upper Snake (and 

 elsewhere in the Columbia complex) but absent from the Bonneville 

 system. These two species are believed to represent part of the origi- 

 nal Snake River fauna that survived a volcanic deluge which pre- 

 sumably destroyed the other species during or after the formation of 

 American Falls but prior to the overflow of Lake Bonneville (Hubbs 

 and Miller, 1948, p. 30). 



Table II. Fishes of the Great Basin 



" These include basins between Pluvial Lake Lahontan and the Columbia, Bonne- 

 ville, and Colorado systems (see Hubbs and Miller, 1948, pp. 43-67). 



The affinities of the upper Snake and the Bonneville Basin proper 

 indicate that 5 species {Prosopiiim williamsoni, Salmo clarki, Cato- 

 stomus ardens, Rhinichthys cataractae, and Cottus bairdi) entered 

 Lake Bonneville from the Snake River; 4 species {Pantosteus platy- 

 rhynchus, P. virescens, Gila atraria, and Snyderichthys copei) moved 

 northward into the Snake; and 3 species {Rhinichthys osculus, 

 Richardsonius halteatus, and Cottus heldingi) may have moved either 

 or both ways. Two primary genera {Richardsonius and Chasmistes) 

 are shared with the Lahontan system and 4 montane species {Pro- 

 sopium williamsoni, Salmo clarki, Rhinichthys osculus, and Cottus 

 heldingi) are common to these two drainages. The Lahontan rela- 

 tionships indicate a former connection, perhaps of Pliocene or early 



