694 F. W. GAMBLE AND F. W. KEEBLF. 



1898. Newbigin, M. E.— 'Colour in Nature: a Study in Biology,' John 

 Murray, pp. i — xii, and 1 — 343, especially pp. 117 — 129, " Colours 

 of Crustacea " and Literature. 



1900. Keeble, F. W., and Gamble, F. W.— " The Colour Physiology of 

 Hippoly te varians," ' Proc. Roy. Soc.,' vol. Ixv, January. 



EXPLANATION OF PLATES 32—36, 



Illustrating Messrs. F. W. Gamble and F. W. Keeble's paper 

 on "Hippolyte varians : a Study in Colour-cliange.''' 



PLATE 32. 



Plates 1 and 2 illustrate some of the more distinctive colour forms of 

 Hippolyte varians found at Piet, and show the close resemblance be- 

 tween the colour or coloration of the prawn and the tints of the seaweed 

 which it selects. The drawings (except figs. 32 and 13) were made by Miss 

 D. Richardson, from specimens placed with the weeds trawled at the same 

 time. After a number of trials it was found that certain colour varieties 

 selected particular weeds ; in other cases direct observation showed that green 

 prawns affect Zostera, brown ones Halidrys and Dictyota. 



Fig. 1. — Two of these specimens show the full green tint assimilating these 

 prawns to the " leaves," and one shows the yellowish colour of the lower parts 

 of the stalks. This difference of tint, associated with a preference for the 

 upper or lower parts of the Zostera, was frequently observed by us. 



Fig. 2. — A green-lined Hippolyte on a piece of green Griffithsia. 



Fig. 3. — Two black-barred specimens on the alga Cladostephus spon- 

 giosus. 



Fig. 4. — Two adult prawns on Laminaria. 



Fig. 5. — A finely red-lined and barred specimen hiding away amongst 

 Gigartina. This is, however, by no means the only red weed affected by 

 this colour variety. 



Fig. 6. — Brown Hippolyte on Halidrys siliquosa. 



PLATE 33. 



Fig. 7. — Young specimen of the "fascigera" variety found among 

 Bowerbankia growing on the stems of Halidrys. 

 Fig. 8. — Small " red-liners " sheltering among red Griffithsia. 

 Fig. 9. — Mid-sized brown specimens on Dictyota die hotom a. 



