264 CRUSTACEA, ECHINODERMS, ETC. 



credit that it could have occupied so small a space. 

 In about three days the newly attired lobster can go 

 about with its mates on equal terms." 



Among many other long-bodied Crustacea (Ma- 

 crourd) which are acclimatised in marine aquaria, 

 shrimps and prawns are of course very abundant. 

 The former is the stock-food for an enormous num- 

 ber of fishes and other animals ; and the intense 



Fig. 193. 



Prawn (Palamon serratus). 



stir there is created in a tank containing fishes when 

 a supply of fresh shrimps is introduced is quite 

 exciting. Both prawns and shrimps are hatched 

 from the eggs, like crabs, in what is called the 

 " zoea stage," in which the five hinder pairs of de- 

 capodal legs are wanting, whilst the two pairs of 

 foot-jaws are employed as locomotive organs. These 

 useful aquarium crustaceans may generally be seen 



