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188 Bailey and Cross <br />Pehlic radials.— Forbes and Richardson (1905) credit Parascu,, ,:- <br />rhynclius albits With 9 "ventral radials," Scaphirhynchus platorynchua <br />with 1. Dissection of the base of one pelvic fin on each of 3 speci- <br />z <br />W <br />J <br />J <br />W <br />Co <br />Cr <br />Q <br />CD <br />i <br />Cr <br />W <br />H <br />C� <br />z <br />W <br />J <br />w <br />0 <br />0 <br />Q 4 <br />• <br />00 <br />• . O <br />•. 0 • 0 • 0 <br />•O0• • 0 <br />•• ;• <br />0 <br />V S. album, 100 -200 m m. <br />♦ S. album, 200 + m m. <br />0 S. plotorynchus, 100-200 m m. <br />• S.plotorynchus, 200 +m m. <br />2 3 4 5 <br />RATIO 8: SNOUT TO OUTER BARBEL /TENTH LATER—_ <br />FIG. S. Scatter diagram contrasting the species of Scaphirhynchus in two ratios derived <br />from four differentiating structural measurements <br />mens of each species reveals no intraspecific or interspecific variation; <br />all have 8 pelvic radials. <br />Gillrakers.— Scaphirhynchus plaiarynchus has more'highly mo <br />