JOURNAL OF CONCHOLOGY. 247 



Balea perversa (L.). 

 Clausilia rugosa (Drap.). 

 Cochlicopa lubrica (MiilL). 

 Achatina acicula (MiilL). 

 Carychium minimum Miill. 

 Cyclostoma elegans (Miill.) 



AUTHENTICATED LIST OF THE MOLLUSCA 

 OF NORTHAMPTONSHIRE. 



The following list is a transcript from the record-books of 

 the Conchological Society, and only includes records which 

 have been authenticated {i.e., verified by the submission of 

 specimens to Mr. J. W. Taylor, one of the Society's referees, and 

 in like manner the slugs have been seen and authenticated by 

 Mr. Wm. Denison Roebuck). These records are therefore uni- 

 form in value with the other 'authenticated lists' published or 

 to be published, in so far as the elimination of certain obviously 

 possible sources of error is concerned. 



The principal materials upon which the following list is 

 based are : — 



(1). A collection of shells made by Mr. Thomas W. Bell, 

 M.C.S., of Leeds, in the immediate neighbourhood of Peter- 

 borough, which is in the extreme N.E. corner of the county, in 

 the years 1877, 1880, and 1882. 



(2). A few shells collected by the Rev. H. H. Slater, 

 M.A., F.Z.S., &c., at Irchester, on the extreme E. border of the 

 county, in the spring of 1884. 



(3). A large collection made within a few miles radius of 

 the town of Northampton, by Mr. W. D. Crick, of that place, 

 during the past two or three years. 



(4). A small collection from Castle Ashby and Maidford, 

 got together by Mr. R. Rogers, and submitted to Mr. Taylor by 

 Mr. Crick. 



