^{page 373 note *} Sars, M., Fauna Littoralis Norvegiæ, Erste Lieferung, Christiana, 1846, p. 47, Tab. 8, f. 1–37.Google Scholar

^{page 394 note *} Grave, Caswell, Johns Hopkins Univ. Memoirs, ivGoogle Scholar.

^{page 394 note †} Selenka, E., Zeitschr. wiss. Zool., Bd. xxviiGoogle Scholar.

^{page 394 note ‡} H. L., Clark, Johns Hopkins Univ. Memoirs, ivGoogle Scholar.

^{page 394 note §} Fleischmann, A., Zeitschr. wiss. Zool., Bd. xlvi., 1888Google Scholar.

^{page 394 note ∥} Ludwig, H., “Entwicklungsgeschichte der Asterina gibbosa,” Zeitsch. w. Zool., vol. xxxvii., 1882Google Scholar.

^{page 394 note ¶} Jourdan, E., Ann. Sci., Nat. Series, 6, T. x., 1879–1880Google Scholar.

^{page 394 note **} Kowalewski, A., Jahresb. Anat. u. Physiol., 1873Google Scholar.

^{page 395 note *} Appellöff, A., Bergen Museum, Aarbog, 1900Google Scholar.

^{page 395 note †} Ludwig, H., “Entwicklungsgeschicte der Asterina gibbosa” Zeitsch. f. w. Zool., vol. xxxvii., 1882Google Scholar.

^{page 395 note ‡} MacBride, E. W., “Variations in the Larva of Asterina gibbosa” Philos. Soc. Camb., May 1894.Google Scholar

^{page 395 note §} Goto, S., Journal of the College of Science, Imp. Univ. Tokyo, Japan, vol. x. pt. iii., 1898Google Scholar.

^{page 395 note ∥} Goto, S., ibid., vol. xii. pt. iii., 1898; and Annotationes Zool. Japonenses, vol. ii. pars iii., 1898Google Scholar.

^{page 395 note ¶} Bury, H., “Studies in the Embryology of Echinoderms,” Quart. Journ. Micr. Sci., April 1889.Google Scholar

^{page 395 note **} Bury, H., “The Metamorphosis of Echinoderms,” Quart. Journ. Micr. Sci., vol. xxxviii. 95–96Google Scholar.

^{page 397 note *} Goto, S., Journal of the College of Science, Imp. Univ. Tokyo, Japan, vol. x. part iii., 1898Google Scholar; vol. xii. part iii., 1898.

^{page 397 note †} Goto, S., ibid., vol. xii. part iii., 1898. We may note that he very clearly indicates the epigastric cœlom to be formed of one-half of the right posterior enterocœle.

^{page 398 note *} Bury, H., “Sudies in the Embryology of Echinoderms,” Quart. Journ. Micr. Sci., April 1889Google Scholar.

^{page 398 note †} Field, G. W., “The Larva of Asterias vulgaris,” Quart. Journ. Micr. Sci., vol. xxxiv., 1894Google Scholar.

^{page 398 note ‡} Macbride, E. W., “The Development of Asterina gibbosa,” Quart. Journ. Micr. Sci., xxxviii., 1895–1896Google Scholar.

^{page 398 note §} Goto, S., Journal of the College of Science, Imp. Univ. Tokyo, Japan, vol. x. part iii., 1898Google Scholar.

^{page 400 note *} Ludwig, H., “Entwicklungsgeschichte der Asterina gibbosa,” Zeitsch. f. w. Zool., vol. xxxvii., 1882Google Scholar.

^{page 400 note †} Goto, S., Journal of the College of Science, Imp. Univ. Tokyo, Japan, vol. x. part iii., 1898Google Scholar.

^{page 403 note *} This will be confirmed later by a description of its later changes. In the adult it has the relationship of a heart-vesicle or pericardial vesicle to the blood-vascular system, the presence of which, I hope, as indicated elsewhere, to show in detail later (Proc. Royal Physical Soc., March 1901).

^{page 403 note †} Masterman, A. T., Natural Science, January 1899.

^{page 404 note *} Proc. Roy. Soc. Edin., Dec. 1898.

^{page 405 note *} Bather, F. A., Journ. London Coll. Soc., viii. (pp. 21–33), May 1901Google Scholar.

^{page 405 note †} Masterman, A. T., Proc. Roy. Soc. Edin., Dec. 1898, and Quart. Journ. Micr. Sci., Aug. 1897.

^{page 405 note ‡} Bütschli, O., “Versuch der Ableitung des Echinoderms aus einer bilateralen Urform,” Zeitsch. f. w. Zool., vol. liiiGoogle Scholar.

^{page 406 note *} Bury, H., “The Metamorphosis of Echinoderms,” Quart. Journ. Micr. Sci., vol. xxxviii. 95–96Google Scholar.

^{page 409 note *} On the nomenclature usually adopted,

^{page 409 note †} Grave, Caswell, Johns Hopkins Univ. Memoirs, ivGoogle Scholar.

^{page 410 note *} Phil. Trans. Roy. Soc. Lond., vol. clxxix., 1888Google Scholar.

^{page 410 note †} Seeliger, O., Zool. Jahrb., Abth. Anat., 4, Bd. 6Google Scholar.

^{page 411 note *} These figures seem to have their true axes of symmetry at 45° to those assumed by Bury.

^{page 411 note †} Semon, R., “Die Entwicklung der Synapta digitata und die Stammes geschichte der Echinodermen,” Jen. Zeitsch. f. Naturwiss, vol. xxii., 1884Google Scholar.

^{page 411 note ‡} Clark, H. L., Johns Hopkins Univ. Memoirs, ivGoogle Scholar.

^{page 412 note *} “The Development of Echinus esculentus,” Proc. Royal Soc., vol. lxix. No. 455.