..The fishes of Illinois . r whollv wanting; scales large and uni- formly distributed, 30 to SO in lateral line e. Lateral line entirely wanting at all ages Erimyzon. ee. Lateral line more or less developed in adults Minytrema. dd. Lateral line complete and continuous. f. Scales small and crowded anteriorly, the number in the lateral line 55 to 110 (except in C. mgricanus, for which see below .ff) Catostomus. ff. Scales large and nearly equal all over the body, 40 to 55 in the lateral line. g. Air-bladder in two parts; scales 48 to 55 in lateral line Catostomus (Hypentelium) nigricans,gg. Air-
..The fishes of Illinois . r whollv wanting; scales large and uni- formly distributed, 30 to SO in lateral line e. Lateral line entirely wanting at all ages Erimyzon. ee. Lateral line more or less developed in adults Minytrema. dd. Lateral line complete and continuous. f. Scales small and crowded anteriorly, the number in the lateral line 55 to 110 (except in C. mgricanus, for which see below .ff) Catostomus. ff. Scales large and nearly equal all over the body, 40 to 55 in the lateral line. g. Air-bladder in two parts; scales 48 to 55 in lateral line Catostomus (Hypentelium) nigricans,gg. Air-bladder in three parts; scales larger, 40 to 50 in lateral line,h. Upper lip protractile, lower entire or incised only part way to anterior mar-gin. i. Pharyngeal teeth compressed; mouth wholly inferior Moxostoma. ii. Lower pharyngeal teeth much enlarged, subcylindrical and truncate; mouth somewhat oblique, lips very thick Placopharynx. hh Upper lip not protractile; lower lip in two separate lobes Lagochila. o 5. •&,.
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
