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i:ey °i0 ~t%C'Ci2$ of Giia in the i°La3i1-CiIaI'til~l iiat~i[a[ of the Upper <br />('nl nradp R117cr R~ci n~ <br />1a. No nuchal hump, frontals nearly straight (Figures 8,10 above), <br />dorsal and anal rays usually 9, distance from anal origin (base of <br />first ray) to caudal base (bases of rays, internally) much less than <br />distance from anal origin to opercle . robusta. <br />Ib. Nuchal-hump present in specimens over 150 mm (Figures 6,9), frontals <br />concave above eyes in lateral profile (Figures 6,9,10 middle and below), ~ • <br />dorsal rays 9 or 10, anal rays 10 or 11, distance from anal origin~to ' <br />caudal base about equal to or greater than distance from anal origin <br />to opercle.. .~ 2. <br />• 2a. Nuchal hump abrupt (Figure 6), dorsal rays usually 9, anal rays <br />usually 10, in young less than 150 mm the eye diameter less than 2/3 <br />caudal peduncle depth, snout overhangs upper lip (Figure 10 middle) <br />. . . . . . . . . . . . . . . . . . . , . . cy~ha. <br />2b. Nuchal hump not abrupt (Figure 9), dorsal rays usually 10, anal <br />rays 10 or 11, i:, young less than 150 mm the eye diameter greater than. <br />2/3 caudal peduncle depth, snout~not~.overhanging upper lip (Figure ZO <br />below) ... elegans. <br />Supplemental characters in Tables 1, 2 and 3 aid identification, <br />especially for difficult specimens and possible hybrids. Hybrids tend <br />to have several characteristics distinctive of each parent and several <br />intermediate. Specimens may be sent to The University of riichigan <br />Museum of Zoology for identification. <br />