INTRODUCTION. 51 



1. Assiminia Grayana. 



2. Bithinia ventricosa. 



3. Arion hortensis. 



4. Zonites crystallinus. 



5. nitidulus. 



6. radiatulus. 



7. lucidus. 



8. pygmaeus. 



13. In 1822, Dr. Turton, in his work on bivalves 

 added — 



1. Pisidium pusillum. 



14. In the same year, Mr. Miller, in his List of Shells 

 about Bristol, with three noticed in the former list, 

 added — 



1. Zonites alliarius. 



15. In the same year, M. Ferussac, in his Prodro- 

 mus, added, — 



1. Pupa anglica, sent him by Mr. Bean. 



16. In 1825, the Rev. Mr. Sheppard, in his List of 

 Suffolk Shells, added — 



1. Vertigo edentula. 



2. Planorbis carinatus, var. deformis. 



3. Pisidium Henslowianum. 



17. In 1826, Dr. Turton, in his Conchological No- 

 tices, in the Zoological Journal, added — 



1. Cyclostoma simile Drap., if not Bithinia ventri- 

 cosa. 



2. Cyclostoma acutum Drap, 



3. Limnaeus scaturiginum = Lim. stagnalis Junior. 



All shells which it is impossible to determine; and 



d 2 



