204 DISCOVERY REPORTS 



(v) The alimentary canal in the bud originates from a rod-shaped primitive gut and 

 the coelomic cavities are derived from the cavity of the stolon ; but in the larva the 

 archenteron, which gives rise to the alimentary canal, is formed by invagination and the 

 coelom originates as pouches from the sides of the archenteron. 



(vi) The stalk of the bud persists after the bud breaks away and gives rise to the 

 stolon of the adult, from the proximal end of which new buds are formed. In the larva 

 no trace of a stolon is present until the young individual settles down. 



LIST OF LITERATURE 



Andersson, K. a., 1903. Eine Wiederentdeckung von Cephalodiscus. Zool. Anz., xxvi, No. 697, pp. 368-9. 

 1907. Die Pterobranchier der Schwedischen Sildpolar-Expedition, 1901-1903. Wiss. Ergebn. Schwed. 



Siidpolar-Exped., v, Stockholm, pp. 1-122. 

 Braem, F., 191 1. Pterobranchier und Bryozoen. Zool. Anz., xxxviii, p. 546. 

 Fowler, G. H., 1905. Notes on Rhabdopleura. Quart. J. Micr. Sci., xlviii, p. 23. 

 Gilchrist, J. D. F., 1915. Observations on the Cape Cephalodiscus (C. gilchristi, Ridewood) and some of its 



early stages, with an appendix by S. F. Harmer. Ann. Mag. Nat. Hist., ser. 8, xvi, pp. 233-46. 

 1^17. On the Development of the Cape Cephalodiscus (C. gilchristi, Ridewood). Quart. J. Micr. Sci., 



LXii, pt. 2, pp. 189-21 1. 

 Harmer, S. F., 1905. The Pterobranchia of the Siboga Expedition, with an Account of other Species. Siboga- 



Exp., XXII, monogr. xxvi bis, Leiden, 132 pp. 

 John, C. C, 1931. Cephalodiscus. Discovery Reports, iii, pp. 223-260. 

 Masterman, a. T., 1900. On the further Anatomy and Budding Process of Cephalodiscus dodecalophus. 



Trans. Roy. Soc. Edinb., xxxiv, p. 507. 

 Narasimhamurti, N., 1932. The Development and Function of the Heart in Echinoderms. Proc. Roy. Soc, 



B, 109, pp. 471-87. 

 SCHEPOTIEFF, A., 1909. Die Pterobranchier des Indischen Oseans. Zool. Jahrb., Abt. Syst., xxviii, p. 429. 



