COLOUR VARIATIONS IN ACTINIAE. 235 



on the Habits of some Sea Anemones," by H. J. Fleure and C. L. Walton), 

 and is the resnlt of difterentiating reactions and a persistent inhibitory 

 stimulus due to the constant repetition of such causes as induced the 

 same, and which alone probably prevent its lapsing. We have already 

 shown that such impressions are evanescent, and it would appear that 

 the whole tissues of these animals are in what may perhaps be termed 

 a more or less plastic state, and hence (at least in many forms) vary- 

 ing environmental conditions readily affect them, and adaptations 

 rapidly result. Hence the abundance of very variable species. 



LITERATURE CITED. 



1. Andres, A. Le Attinie, Fcnma v.. Flora Golf. Neapel, IX, 1883. 



3. Dixon, G. Y. and A. F. Report on Marine Invertebrate Fauna near Dublin. 

 Proc. Roy. Irish Acad., 3rd Series, vol. il, p. 19. 



4. Farquhar, H. Preliminary Account of some New Zealand Actinians. 

 Lin. Soc. Journ. Zool., vol. xxvi, 1898. 



5. Fleure, H. J., and C. L. "Walton. Notes on the Habits of some Sea 

 Anemones. Zool. Aiumger, Bd. xxxi. No. 7, pp. 212-20, 1907. 



6. GosSE, P. H. Actinologia Britannica, 1860. 



7. Haddon, a. C. Revision of British Actiniae, Part I. Tra)is. Eoy. Dub. 

 Soc, vol. IV, ser. ii, No. v, 1889. 



8. MosELEY, H. N, Quart. Journ. Micr. Sci., xiii, 1873. 



9. Stdckey, F. G. a. Review of New Zealand Actiniaria. Trans. N.Z. 

 Institute, vol. XLi, p. 381, 1908. 



10. Walton, C. L, Actiniae collected by s.s. Huxley. Journ. Mar. Biol. 

 Assoc, vol. VIII, No. 2, 1908. 



