154 LIST OF THE PTTLMONIFEEOUS MOLLITeOA 



tho point now alluded to could bo drawn from their occurrence. I 

 have since ascertained, however, from personal examination, that they 

 were imbedded (many of them in the very centre of the mass), which, 

 combined with other appearances which the limits of a notice will 

 not allow me to detail, tends to confirm the idea, that the elevation of 

 this part, at least, of the coast of Berwickshire, must have taken place 

 at a comparatively recent period. 



I may farther mention, in connection with this subject, that on the 

 coast of Fife, immediatel}^ opposite to this, a rise of the land, to the 

 height of about fourteen feet above the present high water mark, has 

 recently been observed by an eminent geologist ; and, probably, the 

 appearance I have now attempted to describe may be considered of 

 the same date. The subject, however, may be recurred to, and more 

 fuUy. 



A List of the Pulmoniferous Mollusca of Berwickshire and North Durham. 

 By G-EOEGE Johnston, M. D. 



MOLLUSCA. 

 Class.— GASTEEOPODA, Cuv. 



OeDER — PULMOBRANCHIA, BlaiuV. 



Family L— LIMACID^E. 



1. Aeion atee, Flem. The Arion circmnscriptus is a variety or imma- 



ture state of this species. Common. 



2. Aeion subflavus. Woods and shaded places. Frequent. 



3. LiMAX cinereus. Frequent. 



4. LiMAx cELLAEius, ListcT. In wine cellars in Berwick. 



5. LiMAx AGEESTis. Very common, and in some years vory destructive 



to early crops. 



6. LiMAX BEUNNEUS, i)r«/j. This differs from every variety of L. 



agrestis, in its darker colour, its colourless mucus, in the abrupt 

 termination of the tail, in the position of the shield, which is 

 nearly central when the animal is fully extended, and in the size 

 of the shield, which is as long as the posterior half of the body ; 

 nor is there any keel on this part. It inhabits shady woods, and 

 is comparatively rare. As a native, its discovery is due to my 

 friend, Mr J. Alder of Newcastle, who pointed out its peculiar 

 characters to me on specimens taken in Dunglass Dean. 



Family II.— HELICID^. 



7. ViTEiNA PELLTJCiDA. Not uncommon. Our Berwickshire shell is 



smaller, and less tinged with green than specimens from England. 

 It is probably the V. Mulleri of Jeffreys.. 



