[327]

Ehlers, Zeitschr. f. wiss. Zool. liii. 1892, p. 217.

[328]

See Claparède and Metschnikoff, "Beit. zur Kennt. d. Entwick der Chaetopoden," Zeitschr. f. wiss. Zool. xix. 1869, p. 163; and Fewkes, "On the Development of certain Worm Larvae," Bulletin Mus. Harvard, xi. 1883, p. 167.

[329]

For an account of the anatomy and development of a Trochosphere, see Hatschek, on Eupomatus, in Arbeit. Zool. Inst. Wien, vi. 1885. Also Meyer, Mt. Zool. Stat. Neapel, viii. 1888, p. 462; and for Polynoid larva see Häcker, Zool. Jahrb. Abth. Anat. viii. 1895, p. 245.

[330]

See Meyer (ref. on p. [261]).

[331]

Many of the Polynoids are sexually dimorphic.