trichocysts of, [143]

Didymium, [90];

D. difforme, [92]

Didymograptus, [282]

Diffluence, [14] f.

Difflugia, [52];

D. pyriformis, [55];

test of, [55]

Digestion, [9], [15] f.;

of reserves in brood-formation, [33];