CONCLUSION. 141 



tint when the animal is located in a pool, the base of 

 which is of a sombre hue. 



The prawn, or shrimp, is somewhat of a gourmand, 

 and requires to be fed occasionally. The most simple 

 food to give either, when in an aquarium, is an open x 

 mussel or cockle. A marine worm, such for instance 

 as the Terrebella, however (as on one occasion I 

 vexatiously discovered), is a dainty more highly 

 prized than the flesh of a bivalve, but one which 

 cannot often be indulged in from its comparative 

 rarity. 



