Dissepiments, [385], [387]

Dissogony, [419]

Distichopora, [284], [286]

Distomatidae, [110]

Distribution of Protozoa, [47];

of Sponges, in space, [239] f.;

in time, [241]

Disyringa dissimilis, [209], [214], [215]

Diverticulum—see Caecum

Division, binary, [10];