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18,E Bailey and Cross <br />I6 ♦ • <br />IS � ♦ ♦ <br />J L , <br />m o` is • ♦� <br />m o • • <br />W ° • • <br />O � i2 <br />v • •• • •� • <br />O • • <br />~ c ' a P • • •;a • • <br />IO : • • • <br />♦ S omum <br />i • • • 5 pmorrncx -r <br />I � I <br />I too <br />goo zoo STANDARD LENG7n <br />FIG. 3. Scatter diagram =ho« ing proportional distance from tip of snout to ba,_ of <br />outer barbel in the = peeies of Scaphirhynch?ls <br />Length and siructure of barbels. —The length of the inner barhel is <br />the only measurement taken that shows no overlap between ;1 <br />species. In platorynchus it varies from 5.3 to 8.2 per cent of +i e <br />standard length; in album, from 3.1 to 5.0 per cent (Fig. 5). "t <br />Quit ; :. in contrast. shows no difference in length, with me :n <br />values ut 8.6 and 8.1 in platorynchzzs and album. The relative lengths <br />• <br />as porayrs I <br />'J� •S aaan <br />CO 9 <br />a— <br />`o •� A • <br />• •� • • • • <br />• • • • • • • <br />r � � <br />0 - <br />2K _ <br />1NOAR, __ .. <br />1: 1C. t. `tatter diagram showing proportional distance from mouth to ba-e o <br />barbel in the species of Scaphirhyrlrhu.s• <br />of both pairs of barber remain constant throughout life. Because <br />of the more posterior origin of the outer barbel in album, the tip when <br />extended lies farther back on the head. commonly reaching or exceed <br />ing the sharp angle of the suborbital: in platorynchus the -tip alway.. <br />falls considerably short of this point. The ratio between the lengths <br />