Derostoma, [44], [50]

Desmogaster, [380]

Desmoscolecidae, [159]

Desmoscolex, [159], [258]

Desor, on Nemertine development, [99];

Type of, larva, [113]

Development, of Polyclads, [28];

of Nemertinea, [99], [113];

of Nematoda, [135];

of Gordius, [171];