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(558) A. Krohn. “Beobacht. üb. Echinodermenlarven.” Müller’s Archiv, 1854.
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(566) Sir Wyville Thomson. “On the Embryogeny of Antedon rosaceus.” Phil. Trans. 1865.

Enteropneusta.

(567) A. Agassiz. “Tornaria.” Ann. Lyceum Nat. Hist. VIII. New York, 1866.
(568) A. Agassiz. “The History of Balanoglossus and Tornaria.” Mem. Amer. Acad. of Arts and Scien., Vol. IX. 1873.
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(570) E. Metschnikoff. “Untersuchungen üb d. Metamorphose, etc. (Tornaria).” Zeit. für wiss. Zool., Bd. XX. 1870.
(571) J. Müller. “Ueb. d. Larven u. Metamor. d. Echinodermen.” Berlin Akad., 1849 and 1850.
(572) J. W. Spengel. “Bau u. Entwicklung von Balanoglossus.” Tagebl. d. Naturf. Vers. München, 1877.

[231] A very complete and critical account of the literature is contained in this paper.

[232] There is a Russian paper by the same author, containing a full account, with clear illustrations, of his observations.

[233] The dates in this reference are the dates of publication.

CAMBRIDGE: PRINTED BY C. J. CLAY, M.A. & SON, AT THE UNIVERSITY PRESS

Transcriber’s Note:

Punctuation, hyphenization, and accent marks were standardized. Missing letters were added, as appropriate.

Consistently misspelled words (e.g. hydrophillia) and inconsistent superscripting of French abbreviations, 2me, 2me, were not changed.