Bdellostoma, [394], [405]

Belinurus, [24], [249], [351]

Bird, rhomboidal sinus, [46]

Bladder, [449]

Bla"der, swim, [148]

Blastula, [459], [471], [473]

Blood, [463], [472], [474]

Bl"od, circulation, in Ammocœtes and Limulus, [174]

Bl"od, secretion of ductless glands into, [418]

Bothriolepis, [29], [32], [239], [326], [351], [450]