52 INTRODUCTION. 



with them he introduced the foreign Bulimus decol- 

 latus. 



18. In 1829, Mr. Jeffreys, in his paper in the Lin- 

 nean Transactions, added 



1. Succinea oblonga. 



2. Helix concinna. 



3 lamellata, from Mr. Bean. 



4. Vertigo cylindrica. 



5. pygmaea, from my specimen in B. M. 



6. palustris, from my specimen in B. M. 



7. pusilla. 



19. In 1830, Mr. Alder, in his List of Newcastle 

 Shells, added - 



1. Succinea Pfeifferi, distinguished as a variety 

 by Jeffreys. 



2. Zonites purus. 



3. excavatus. 



20. In 1831, Capt. Brown, in the Edinburgh Journal 

 ef Geographical Science, added 



1. Pisidium obtusale. 



2. pulchellum. 



21. In 1831, Dr. Turton, in his Manual, added 

 5. Limax carinatus, from Dr. Leach's work. 



22. In 1831, Mr. Lindsay, in the Linn. Trans., added 

 1. Helix obvoluta. 



23. In 1832, Mr. Jenyns, in his Monograph on 

 Cyclas and Pisidium, added 



1. Pisidium iiitiduiru 



24. In 1834, Mr. Thompson, in a notice read at 

 the Linnean Society, added 



