VI PREFACE. 



work lias stimulated the exertions of naturalists, so that 

 species of the group, previously unknown, are added almost 

 every year to our Fauna. Dr. Kinahan has described, only 

 a month ago, a fine distinct new species of Crangon, dredged 

 in the Irish Sea, where Professors Allman and Melville and 

 the late Mr. Thompson of Belfast were so successful. The 

 researches of Mr. Spence Bate and his correspondents have 

 quadrupled the list of Amphipods, while naturalists eagerly 

 expect the fine work, on these Crustacea and their allies, 

 which he and Mr. "Westwood are preparing to publish in 

 the same form as that of Professor Bell. 



In the following popular history of British Crustacea, the 

 general arrangement is that of the classical ' Histoire Na- 

 turelle des Crustaces/ by Professor Milne-Edwards. Among 

 the Amp/dpocla, I have been chiefly guided by Mr. Spence 

 Bate's synopsis, published in the February number of the 

 ' Annals and Magazine of Natural History/ In the Ento- 

 mostracous portion, I have compiled almost exclusively 

 from Dr. Baird's valuable volume, published by the Bay 

 Society, adding a few species discovered by Dr. Baird and 



