..The fishes of Illinois . osition of the dorsal fin is contained more, or=less, than twice in the fishslength. 4. The Scales The most ready indication of the size of the scales in a fish is furnished by the enumer-ation of the scales in the lateral line, or, if that is absent, of those in a line alongthe horizontal axis, as nearly as possible, from the*upper corner of the gill-open-ing to the base of the caudal rays. It is customary in descriptions to includealso counts of the scales in oblique series from the middle line of the back to thelateral line and including it; and the number between
..The fishes of Illinois . osition of the dorsal fin is contained more, or=less, than twice in the fishslength. 4. The Scales The most ready indication of the size of the scales in a fish is furnished by the enumer-ation of the scales in the lateral line, or, if that is absent, of those in a line alongthe horizontal axis, as nearly as possible, from the*upper corner of the gill-open-ing to the base of the caudal rays. It is customary in descriptions to includealso counts of the scales in oblique series from the middle line of the back to thelateral line and including it; and the number between the lateral line (not in-cluding it) and the median line of the belly in front of the anal fin. Thesecounts are expressed in a conventional formula, Scales 6-42-9, for example,indicating 6 scales in an oblique series above the> lateral line, 42 in the lateralline (or in a longitudinal series from the gill-opening to the base of the caudalrays), and 9 in an oblique series below the lateral line. CXX1V FISHES OF ILLINOIS.
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
