UPON COLOUR. 43 



at all in shallow water or in a full light ; and those 

 that canbear such circumstances are commonly affected 

 by them in a very marked degree, — marked by the 

 degeneracy of their forms, and by the loss of their 

 brilliancy of colour. The Prawn, as I have already 

 hinted, delights in the obscurity of deep holes and 

 rocky pools ; it is here alone that his fine zebra-like 

 colours are developed. When taken in shallow pools, 

 he is of the plain pale-olive tint of the specimen that 

 had spent four- and- twenty hours on my table. 



