26 THE LIFE OF CRUSTACEA 



happens to touch the antenna or the [legs]. It is 

 not seen at all. But sooner or later, according as 

 the distance is short or great, the scent of the food, 

 carried by the currents set up by the exopodites of 

 the maxillipeds, reaches the Lobster. The Lobster 

 is immediately excited, although previously it was 

 lying quite inert in its hole. It whips the water 

 with its antennules in a staccato fashion, and feels 

 about with the antennae and chelae, at first without 

 leaving its hole. At once both antennules are seen 

 to be whipping in the direction in which the food 

 is lying, and an active search is made with the 

 antennae. If they do not succeed in locating the 

 bait, the lobster rather reluctantly leaves its hole, 

 but cautiously, feeling all round about with its 

 antennae. It goes off straight in the direction in 

 which the food is lying, and, if it misses it with its 

 antennae and chelae, walks over it and gets it with 

 its chelate [walking legs] ; it usually picks up its 

 food with the second [walking leg]. Meanwhile 

 the expected feast has by association stimulated the 

 maxillipeds, which are actively working as if they 

 were already masticating the food. Once the food 

 is seized it is conveyed to the maxillipeds, and the 

 Lobster retreats to its hole, there to enjoy its meal." 

 Lobsters, like most other Crustacea, are of separate 

 sexes. The females (see Plate I.) may be distin- 

 guished from the males by the fact that the abdomen 

 is broader and has deeper side-plates, and by differ- 



