The following arrangement was drawn up by P. J. 
Selby, Esq., at the request of some of the Committee 
of the Natural History Society, and is printed for 
the purpose of exhibiting the Genera wanting in their 
collection, and to facilitate the exchange of specimens. 
Those Genera which they already have, are marked 
with a *. Specimens, or offers to exchange, will be 
thankfully received. 
