ADVERTISEMENT. 
* ,-V». 
When th,s Work commenced, it was the intention of the Author to have completed it „ 
todve or lour teen numbers, but the discover), of several new specie, has rendered ,|,i. 
imposs, i e . and lie mil consequently, be uniter the necessity of extending it to eighteen 01 
nineteen numbers, one of which will be published as usual, on the first day of even- .room 
am Ire!,' tfT m!, “t Wi “ SUd ' * *» the systematic 
? g , f th f WOek i which ' w hen completed, will form one volume; to which 
V me gene,al rcmai ' ks ° n the Bntlsh Crustacea, and an Index of Synonyms will be added. 
as to enaWMhe tlie ^ Vork 18 to be P ablished miscellaneously, yet the plates are so numbered, 
as to enable the purchaser to arrange, it systematically, when complete. 
