[77]

Huxley, Anat. of Invert. Animals, 1877, p. 194.

[78]

Braun, Bronn's Thierreichs, Bd. iv. p. 792; Leuckart, Parasiten d. Menschen, 11 Abth. p. 158; Brandes, in Spengels Zool. Jahrb. Syst. Abtheil. Bd. v. 1890, p. 849; v. Nordmann, Mikr. Beitr. i. Berlin, 1832.

[79]

Heckert, Bibliotheca Zoologica (Leuckart and Chun), Heft 4, 1889. I am not aware that Leucochloridium has been noticed in England.

[80]

"Heterogamy" usually means the alternation of bisexual and unisexual generations (e.g. Rhabdonema nigrovenosum), but is, unfortunately, also used in the sense of Alloiogenesis, as defined above. See Grobben, Arbeit. Zool. zoot. Ints. Wien, Bd. iv. 1881, p. 201.

[81]

Parasiten, Bd. i. Abth. II. p. 152.