..The fishes of Illinois . ne Falls. It is especially anorthern Illinois fish, only one of our collections made in the south-ern part of the state containing it, and this falling outside the areaof the lower Illinoisan glaciation. It is about equally common incentral and northern Illinois, and has been more uniformly distrib-uted, according to our observations, than the other species of itsgenus, occurring in about equal frequency, relatively to the numberof collections made, in the larger rivers and in creeks and lakes, butabout twice as abundantly in the smaller rivers. It shows also con-sid

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..The fishes of Illinois . ne Falls. It is especially anorthern Illinois fish, only one of our collections made in the south-ern part of the state containing it, and this falling outside the areaof the lower Illinoisan glaciation. It is about equally common incentral and northern Illinois, and has been more uniformly distrib-uted, according to our observations, than the other species of itsgenus, occurring in about equal frequency, relatively to the numberof collections made, in the larger rivers and in creeks and lakes, butabout twice as abundantly in the smaller rivers. It shows also con-siderably less marked preference than the preceding species forclear and swiftly flowing waters. Genus PLACOPHARYNX Cope (pavement-toothed red-horse) Suckers like Moxostoma in all respects, except that the pharyngealbones are much more developed and the teeth reduced in number, thoseon the lower half of the bone very large, 6 to 10 in number, nearly cylin-drical in form, but little compressed and with a broad and more or less. -ft, w «ow Q wPS Qw 0<! aa H PioM ???, ;

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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes