46 INTRODUCTION. 



Pupa juniperi, 



Clausilia Rolphii, 



bidens, 



Cyclostoma elegans, 



in shady situations under nettles, dog's mercury, &c., 

 in woods, especially on a chalky soil. 



It may be interesting to give an outline of the his- 

 tory of the various additions which have been made 

 from time to time to this part of our Fauna. 



1. Merret, who, in 1667 published the first at- 

 tempt at a British Fauna, in his Pinax, has recorded 

 six species. 



1. Anodon cygneus (Mytilus, or Horse Muscle). 



2. Limneus (L. stagnalis ?). List. Ang. t. 2. f. 1. 



3. Limax maximus. 



4. Helix Pomatia, which he says is found in Sussex. 



5. Helix rufescens (Cochlea alba minor ubique in 

 hortis). 



6. Helix nemoralis ( Cochlea vulgaris testa variegata}. 

 List. Ang. t. 2. f. 3. 



2. Dr. Lister, in 1678, commenced a separate work 

 on the British shells, and, as was to be expected from 

 his accuracy and the extent of his researches, he may 

 be considered as the originator of this part of the 

 science. He described and figured in this work, and 

 in his larger work on conchology (where he marked 

 the British species with an A), the following species ; 

 and has besides given a good account of their animals. 

 He gave, in the appendix to his larger work, the dis- 

 sections of many of them. 



