Trematodes, [70] f.
Bladder, of Rotifers, [214]
Bladder-worms, [5], [79] f., [89]
Blanchard, on Cestoda, [91];
on Hirudinea, [392] f., [405], [408]
Blastomeres, of egg of Distomum, [65]
Blood, of Nemertinea, [108];
of Polygordius, [244];
of Chaetopoda, [252];