OCTio 1900 



HIPPOLYTE VARIANS. 589 



Hippolyte varians: a Study in Colour-change. 



By 



F. Vir. Gamble, D.Sc, 



Oweus College, Manchester, 



and 



F. \¥. Keebic, M.A., 



Caius College, Cambridge ; late Assistant Lecturer in Botany, Owens 

 College, Manchester. 



With Plates 32—36. 



Contents. 



FAOE 



589 

 595 

 601 

 605 

 612 

 622 

 635 



Introduction ...... 



Section I. Methods ..... 



,, II. Some Colour Forms of Hippolyte varians 

 ,, III. " Chromatophores " and other Colour Elements 

 „ IV. The Colour Mutability of Hippolyte varians 

 ,, V. The Nocturnal Colour — Nocturnes 

 „ VI. Periodicity of Colour-change 



„ VII. The Control of the " Chromatophores :" the Parts played 

 by the Eye, Central Nervous System, and by the 

 " Chromatophores " themselves in effecting Colour 

 change ..... 



,, VIII. Summary of Experimental Records 

 Appendix — Experimental Tables .... 



Literature 



Introduction. 



It is well known that the prawn Hippolyte varians may- 

 be found among the seaweeds in the lower tidal pools along 



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