406 TORREY 



(^d) That variation of structural types is not correlated with mode 

 of reproduction, but that the cause of such variation must be sought 

 among the causes of variation in the number of siphonoglyphs, of the 

 correlation of siphonoglyphs and directives, and the like. What these 

 causes are is at present unknown. 



BIBLIOGRAPHY. 



Note. — For fuller lists of authorities on the Actiniaria, see Andres, 1884 ; 

 Carlgren, 1893; McMurrich, 1893, 19011^. 



Andres, A. 



1882 Intorno alia Scissiparita della Attinie. Mitth. Stat. Neap., in, pp. 124- 



148. 

 1884 Fauna und Flora des Golfes von Neapel. ix. Le Attinie. 



Carlgren, 0. 



1893 Studien uber Nordische Actinien. i. Konigl. Svenska Vetenskaps- 

 Akademiens Handlingar, xxv, 14S pp., 10 pis. 



Dana, J. D. 



1846 Zoophytes of the U. S. Exploring Expedition of 1S38-1842. 



Danielssen, D. C. 



1890 Actinida, Norweg. North Atl. Exp. of 1876-1878. Zoology. Chris- 

 tiania. 



Dicquemare, J. F. 



1775 -^ Second Essay on the Natural History of Sea Anemones. Phil. Trans., 



vol. 65. 

 1777 A Third Essay on the Natural History of Sea Anemones. Phil. Trans., 

 vol. 67. 



Ehrenberg, C. G. 



1834 Die Corallenthiere des Rothen Meeres. Berlin. 



Faurot, L. 



1895 Etudes sur I'Anatomie, I'Histologie et le Developpement des Actinies. 

 Arch. Zool. Exp. (3), iii, pp. 43-262. 



Gosse, F. H. 



i860 A History of the British Sea Anemones and Corals. London. 



Haddon, A. C. 



1898 The Actiniaria of Torres Straits. Sci. Trans. Roy. Dub. Soc. (2), vi, 

 no. 16, pp. 393-522. 



Hertwig, R. 



1882 Report on the Actiniaria. Chall. Rep. Zool., vi, 136 pp. 



Kwietniewski, C. R. 



1896 Revision der Actinien. Jen. Z., xxx, pp. 583-603. 



