of Oligochaeta, [358];
of Hirudinea, [396];
of Gephyrea, [414];
of Phoronis, [454];
of Polyzoa, [468], [469], [487]
Digitibranchus, [353]
Diglena, [212], [217], [224], [226]
Digonopora, [16]
Dimorphism, in Polystomum, [59];
sexual, of Trematodes, [70];