The Colour- Physiology o/Hippolyte varians. 461 



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| 4243-10 



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" The Colour-Physiology of Hippolyte varians" By F. W. Keeble, 

 Caius College, Cambridge, and F. W. Gamble, Owens College, 

 Manchester. Communicated by Professor 8. J. Hicksox, 

 F.R.S. Eeceived October 25— Read November 23, 1899. 



The following paper gives in a categorical fashion the chief results 

 of a research on the changes of colour in the prawn Hippolyte varians. 

 The work was carried out last year partly in the Zoological Labora- 

 tories of Owens College, Manchester, partly at the station furnished 

 by the Lancashire Sea Fisheries Committee at Barrow • and during the 

 past summer in M. Perrier's Laboratory at St. Vaast, Normandy. A 

 fuller description of the experiments, together with figures, will appear 

 shortly. The present abstract contains the following sections : — - 

 I. Previous knowledge of colour-change in Hippolyte varians. 

 II. Methods adopted for obtaining reliable colour records — 



a. Colour registration. 



b. Chromatophore examination. 



