YOUNG OF LOBSTER. 



26l 



rudimentary " swimmerets " have appeared on the 

 second to the fifth segments of the abdomen, whilst 

 the large claws are in process of formation. Even 

 after the young have reached what is called the adult 

 stage, they are so unlike fully developed lobsters that 

 they might be regarded as a different genus. Their 

 movements are now very much like those of shrimps, 

 and they frequent the surface of the water much more 

 than the bottom. All the above changes are believed 

 to take place in a single season. 



Fig. 192. 



Third larval stage of Lobster. 



Like all the crustaceans, thick-tested species parti- 

 cularly, the lobster increases in size by moulting or 

 casting off its old coat, which is thrown off in one 

 piece, and looks so perfect that it might be taken for 

 the animal itself. Not unfrequcntly it casts an odd 



