Till. INTRODUCTION. 



cut from a printed catalogue, should be arranged in 

 columns, taking care to have sufficient room for the 

 shells, and thus, by a little contrivance, the names 

 of the whole of the species may be made exactly to 

 fill the case. Above the names several specimens of 

 as many kinds as you are possessed of should be fast- 

 ened ; the remainder can be added from time to time, 

 as you are able to meet with them. Boys will find 

 this an excellent plan. For cabinets they are, perhaps, 

 best mounted on separate pieces of wood, with the 

 labels, synonyms, locality, &c. attached. There is an 

 advantage in this latter plan, the specimens can be 

 lifted so as to be more closely examined or even placed 

 under a microscope. Some prefer keeping them in 

 small pill boxes, with the label outside, this plan, too, 

 has its advantages. 



We would advise those who are collecting, to obtain 

 more individuals of any species than they want, espe- 

 cially of those that are somewhat rare and local; that 

 so they may have the means of exchanging for others, 

 which they may be in want of. 



We have not thought it worth while to burden our 

 pages, with even giving the names of species which 

 have been erroneously introduced into the British 

 Fanna, with the exception of one or two which have 

 found their way into almost every collection, and some 

 which are almost acclimatized. H. aperta, which ap- 

 pears in all works on British Conchology, is retained, 

 though not strictly British. One or two shells which 

 are now and then found amongst the debris of rocks 

 or in superficial deposits may be considered as sub- 

 fossil. In this state we have found, among others, 

 Succineo oblonqa. Zua lubrica, Bithinia tentaculata, 



