602 



F. W. GAMBLE AND P. W. KBEBLE, 



free to select their weeds, and, as is seen in the figures, they 

 succeeded in making wonderfully accurate colour matches. 



It is noteworthy that in captivity the prawns often lie 

 beneath and along the weed, except when the light falls 

 only from above, in which case the animals tend to place 

 themselves in a vertical position (Fig. 2). 



Pig. 2. 



Showing the vertical position adopted by Hippolyte varians when illumi- 

 nated by diffuse light from above. The jar had been standing under a 

 stream of water since the previous evening, and had been shaded from 

 light except that coming through the muslin cover. The prawns at 

 10.15 a.m., December 17th, 1898, were without exception in the vertical 

 (head down) position shown, and though the weed was brown in colour 

 they were of the most varied tints — green, purplish brown, red, and grey. 



The brown variety of Hippolyte varians (mature speci- 

 mens) abounds amongst the masses of brown Halidrys 



