gills, [283], [284];

air-bladder, [298], [299];

vascular system, [319], [322], [328], [334];

spleen, [343];

gonoducts of female, [400], [405];

distribution, habits, and food, [493];

breeding, [494];

economic value, [494];

A. huso, [494];

A. rhynchaeus, pectoral fin, [243];