nervous system, [254], [255];

eye, [255];

vascular system, [247], [251];

dorsal ciliated organ, [247], [254], [256];

nephridium, [253];

reproduction, [256];

sexually mature, [276], [276] f.;

sexual dimorphism and Heteroneid phase, [276] f.;

epitokous (= epigamous) and atokous phase, [277] n.;

from fresh water, [284];