THE CRAYFISH 



135 



spring back again into the shallower bays ; the time of migra- 

 tion depending upon the length of the season. It is said to be 

 a nocturnal animal, searching most actively for its food at 



Fig. 131. — Palinurus, the spiny lobster. One-fourth nat. size. From Rath- 

 bun ; drawn by H. L. Todd. 



night. The sense which probabl.y aids it most in this search 

 is the chemical one, as the attraction of the bait in the traps — 

 the so-called lobster-pots — testifies. In respect to food it is, 

 like the crayfish, omnivorous. 



Protection of the Lobster. — There has been much dif- 

 ference of opinion in regard to the size at which a lobster 



