D. clavigerum, life-history, [72];

D. conjunctum, [63];

D. crassum, [63];

D. cygnoides, life-history, [72];

D. cylindraceum, [72];

D. dimorphum, [72];

D. echinatum, [63];

life-history, [72];

D. echiuri, [444];

D. endolobum, life-history, [72];