ARTISTIC TOUCHES 



73 



the chelipeds are of no unusual length. The very long 

 external antenna3 are a special feature of this crab. When 



Fig. Z.—Corystes cassivelnunus (Pennant), a female specimen, with the features on the 

 carapace slightly accentuated. [Herbst.] 



the animal is burrowing in the sand according to its wont, 

 the flagella of these antennae are brought close together, 

 and the tips alone project from the funnel of the burrow. 

 They are provided with stiff hairs on the inner margin, 

 which no doubt assist in maintaining the funnel-opening 

 of a due width. The joints of the peduncle can be strongly 

 bent, and by this means, as Mr. Couch observed, the hairy 

 fringes of the flagella can be made to brush one another 

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