deposition of ova and spermatozoa in, [116]
Nemertinea, affinities, [119];
anatomy, [102];
body-wall, [102];
breeding, [116];
cephalic slits and cerebral organs, [107], [273];
circulatory system, [106], [107];
classification, [109] f.;
colour, [102];
contractility, [102];