Ectoderm, of Mesozoa, [93], [95]

Ectoparasitic Trematodes, [4], [52], [53]

Ectoprocta, [475], [518];

structure, [469];

lophophore, [476];

reproduction, [506] f.;

larva, [509], [510], [511];

compared with Entoprocta, [488]

Effects, of parasites on their hosts, [56], [68], [69], [80], [94], [162]

Eggs, of Leptoplana, [10], [16];