head, [260], [261];

uncini, [266], [267];

nephridia, [269], [306];

genital organs, [273];

development of gills, [275];

gland shields, [287]

Saccobdella, [226]

Sacconereis, [275], [276], [280]

Saccosoma, [434], [440], [442]

Sagitella, [321]