Leptodera, [129], [131], [133], [160]

Leptoplana, [7], [8], [9], [11], [14], [17];

British species, [19];

habits, [8] f.;

anatomy, [11] f.

Leptoplanidae, [19]

Leptostoma, [396]

Lesson, on Polyclads, [24]

Leuciscus, parasites of, [173], [182]

Leuckart, on Platyhelminthes, [6], [64] f., [70], [76];