BIBLIOGEAPHY OF CEPHALOIHSCUS. 63 



females with two testes and two ovaries respectively. There is no sexual dimorphism 

 such as occurs in the case of C. sibogae (Harmer) ; the three kinds of polypides 

 males, females and hermaphrodites are indistinguishable externally, except in so 

 far as the ducts of the testes do not as a rule possess the red pigment that 

 occurs in the oviducts (pp. 45-47 and pp. 57-59). 



8. The mode of development of the buds of C. nigrescens and C. hodgsoni 

 is considered (pp. 47-49 and pp. 59-62). 



9. The clear refractive beads found in the end bulbs of the plumes of C. hodgsoni 

 are regarded, not as rhabdite- cells, but as the material of the tubarium in process 

 of secretion, after the manner of the globules of mucus in a goblet-cell (pp. 56-57). 



BIBLIOGRAPHY OF CEPHALOD1SCUS. 



1. ANDERSSON, K. A. " Eine Wiederentdeckung von Cqrtialodiscus." Zool. Anzeiger, xxvi. (1903), 



pp. 3G8-369. 



2. COLE, F. J. "On the Discovery and Development of Khabdite-' cells 'in Cephalodiscus dodecalophus." 



Journ. Linn. Soc. Zool., xxvii., pp. 256-208 (1899), one plate. 



3. DELAGE, Y. et HEROUARD, E. Traite de Zoologie Concrete, v., Paris (1897), pp. 171-181 ; also viii., 



(1898), pp. 331-333. 



4. EHLEES, E. "Zur Kenntniss der Pedicellinecn." Abhandl. k. Gesellsch. Wiss. Gottingen, xxxvi., 



Pkys. Klasse, 1889 (1890), pp. 200, five plates. (Discusses structure and affinities of Cephalodiscus 

 pp. 164 et seq.) 



5. FOWLER, G. H. Article " Hemichorda." Eucycl. Britann., Ed. 10, xxix., 1902, pp. 249-252. 



6. HARMER, S. F. Appendix to Report on Geplialodiscus. 'Challenger' Eeports, Zool., xx., pt. Ixii. 



(1887), pp. 39-47, four text-figures. 



7. HARMER, S. F. " On the Notochord of Cephalodiscus" Zool. Anzeiger, xx. (1897), pp. 342-346. 



8. HARMER, S. F. " On new localities for Cephalodiscus.'''' Zool. Anzeiger, xxvi. (1903), pp. 593-594. 



9. HARMER, S. F. Article " Hemichordata." Cambridge Natural History, vii. (1904) (Pterobranchia, 



pp. 21-27). 



10. HARMER, S. F. "The Pterobranchia of the Siboga Expedition, with an Account of other Species." 



Resultats des Explorations a borcl du Siboga. Livr. xxii., Monogr. xxvi. bis; Leiden (1905), 

 pp. 132, 14 plates and two text-figures. 



11. KEMNA, A. "L'origine de la corde dorsale." Ann. Soc. Roy. Zool. et Malacol. Belgique (Bull, des 



Seances), xxxix. (1904), pp. 85-157 (Author's reprints, pp. 1-73). 



12. LANG, A. "Zum Verstiindniss der Organisation von Cephalodiscus dodecalophus." Jen. Zeitschr., 



xxv. (1890), pp. 1-12, no figures. 



13. LAXKESTER, E. 11. "A Contribution to the Knowledge of Rhabdopleura." Quart. Journ. Micro. 



Sci., n. s., xxiv. (1884), pp. 622-647, five plates. (Contains a few ailusious to Cephalodiscus.') 



14. LANKESTER, E. R. Article " Polyzoa." Encycl. Britann., Ed. 9, xix., 1885, pp. 429-441. (Contains 



the first published figures of Cephalodiscus ; they were made from drawings supplied by 

 Prof. M'Intosh.) 



U 



