Entwickelungsgeschichtliche Untersuchungen, Prag, Heft i. 1888, p. 33.
See Kleinenberg, Quart. J. Micr. Sci. xix., 1879, p. 206.
Both Col. Feilden and Mr. Trevor-Battye found specimens in Kolguiev.
Neue wirbellose Thiere, Leipzig, ii. 1861, p. 11.
Kew Bull. Misc. Information, No. 46, 1890.