Depastrum cyathiforme, [321]
Depressor muscles of compasses of Echinus esculentus, [527]
Dercitus bucklandi, [221]
Dermal, gill—see Papula;
membrane, [170]
Dermalia, [201]
Dermasterias, [471]
Desma (the megasclere which forms the characteristic skeletal network of the Lithistida, an irregular branched spicule), [215], [224]
Desmacella, [224]