INTRODUCTION. 7 



alike being relieved of their hard coating. The creature 

 continues very shy until the new shell acquires firmness and 

 strength, and retires into some crevice of a rock or stone. 

 When Crustacea lose a limb by accidents or by rencontres 

 with an enemy, it grows again at the next regular period of 

 exuviation. 



Professor Edwards and other eminent naturalists regarded 

 the inner pair of the antennse as being organs of smell, and 

 the outer or longer autennse as organs for hearing. Dr. 

 Farre has shown in Galathea, Mr. Huxley in the Stomapoda, 

 and Mr. Spence Bate in the Short-tailed Crabs, that the 

 reverse of this is the case, the shorter antennae being audi- 

 tory organs, and the longer or outer antennse being used 

 in smelling, or at least in some similar function. Mr. 

 "Warrington's observations on the Shrimp, given further on, 

 directly confirm the observations made by the needles, 

 knives, and microscopes of these anatomists. 



Mr. Wilson* relates in a very pleasing way a mode of 

 catching Crabs used by the Arran fishermen, which may be 

 new to most of our readers, as well as the moral he so cle- 

 verly derived from it. 



* ' A Voyage round the Coasts of Scotland and the Isles/ by James Wilson, 

 F.R.S.E : vol. i. p. 26. 



