development, [439];

parasites, [444];

habits, [442]

Echiurus, [336], [411], [435], [440], [441];

development, [439]

Eckstein, on Rotifers, [198]

Eclipidrilus, [380]

Economic uses, of Polychaeta, [296], [297]

Ectocyst, [469], [470], [523];

of Phylactolaemata, [496] f., [503]