..The fishes of Illinois . horizontal, the tip of upper lip below level of lower marginof pupil; maxillary usually not quite reaching orbit, to 4. 5 in head;lower jaw shorter than upper; isthmus less than pupil. Teeth variable:0, 4-4, 1; 1, 4-4, 1 ; 1, 4-4, 2 ; or 2, 4-4, 2; teeth of main row more or lesshooked, and generally quite compressed, the grinding surface developedas a quite narrow groove whose edges are smooth; intestine .9 to length of head and body; peritoneum silvery, finely but not denselyspecked with dark. Dorsal fin with 8 rays, set usually a trifle in advanceof th
..The fishes of Illinois . horizontal, the tip of upper lip below level of lower marginof pupil; maxillary usually not quite reaching orbit, to 4. 5 in head;lower jaw shorter than upper; isthmus less than pupil. Teeth variable:0, 4-4, 1; 1, 4-4, 1 ; 1, 4-4, 2 ; or 2, 4-4, 2; teeth of main row more or lesshooked, and generally quite compressed, the grinding surface developedas a quite narrow groove whose edges are smooth; intestine .9 to length of head and body; peritoneum silvery, finely but not denselyspecked with dark. Dorsal fin with 8 rays, set usually a trifle in advanceof the ventrals and nearer snout than base of caudal; longest dorsal rayabout equal to the length of the short head; anal rays 8 ; pectorals scarcely| to ventrals; ventrals usually short of vent. Scales 5 or 6, 36 to 39, 4;15 to 18 before dorsal; longitudinal rows of scales above lateral line withthe appearance of running out behind dorsal fin, as in N. cormttus;lateral line usually complete, not much decurved anteriorly. ( ia. Fig. 36 This abundant, graceful, and we1-known species, essentiallya northern minnow in this state, is much the most abundant in ourlargest rivers and in lakes, its frequency ratio in the former , and in the latter In small rivers and in creeks it has beentaken only occasionally, the corresponding ratios being .29 and . is abundant in its favorite localities, and appears in 147 of ourcollections. In Illinois it is limited to the Mississippi and LakeMichigan drainage, and has occurred but twice south of the centralpart of the state, once in Union county and once from the Ohio atCairo. We have found it most frequently in the Illinois River andits adjacent waters at Havana and Meredosia, from which twoplaces 119 of our collections have come. It is also one of the com- NOTROPIS 143 monest longshore minnows in southern Lake Michigan, swarmingespecially about the piers off Chicago, where it is caught in quanti-ties and sold for bait. Although rep
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
