ADVERTISEMENT. 
Tars Work will consist of twelve or fourteen Numbers (one Number to be published every 3 Seep 
two Months), which will form, when complete, one hanes -thick Volume: s 
Although this Work is to be published miscellaneously, yet the Plates are numbered,” to ae é “ 
enable the Purchaser to arrange it systematically, when complete. Cte eee 
The following species, viz. Astacus Arctus, and Mantis of Pennant, seem to have been’ 
introduced into the British Fauna on slender authority, and fragments. of a. species of the ae 
genus Sguilla which were found by the late Mr. Boys in a Torbay trawl-boat, are preserved in gE 
the cabinet of Montagu : information therefore on these or on other species is very desirable, — 
and we shall feel obliged to any Naturalist who shall render us any, assistance in making this. 
publication as cobilete as oie. , 3 
The mode of obtaining Crustacea is easy ; Crab and Prawn-Pits, also the rubbish taken Re: & 
from the bottom of the sea by dredgers, shouldbe carefully examined, as either new or rare Be 
species often occur, and are rejected by the Fishermen asuseless ; when obtained they should be 
immersed in fresh water, for the’ purpose of extracting the salt, after which they should be ko 
im the shade, and if possible, in a draft of air. bei ie 
