[32]

Many Nudibranchiate Mollusca undergo this change of habitat. See Garstang, Journal of the Marine Biological Assoc. n.s. i. No. 4, 1890, p. 447.

[33]

Chun, "Ctenophoren," Fauna u. Flora G. v. Neapel, Monogr. I. 1880, p. 180.

[34]

See Lang, "Polycladen," p. 607.

[35]

Lang, "Polycladen," Pl. 30, Fig. 8.

[36]

Kongl. Fysiograf. Sällskapets Handlingar, Bd. iv. Lund, 1892-93.