J54 LIST OF TUB PULMON1FEROUS MOLLUSCA 



ever, from personal examination, that they wore 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 Berwick- 

 shire, must have taken place at a comparatively recent period. 



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

 coast of Fife, immediately opposite to this, a rise of the land, to the 

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

 cently been observed by an eminent geologist ; and, probably, the ap- 

 pearance I have now attempted to describe may be considered of 'the 

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



A List of the Pulmoniferous Mollusca of Berwickshire and North 

 Durham. By GEORGE JOHNSTON, M. D. 



MOLLUSCA. 



CLASS.GASTEROPODA, Cuv. 



ORDER PULMOBRANCHIA, Blainv. 



FAMILY I LIMACIDvE. 



1. ARION ATER, Flem. The Arion circumscriptus is a variety or im- 



mature state of this species. Common. 



2. ARION SUBFLAVUS. Woods and shaded places. Frequent. 



3. Li MAX CINEREUS Frequent. 



4. LIMAX CELLARIUS, Lister. In wine cellars in Berwick. 



5. LIMAX AGRESTIS. Very common, and in some years very destructive 



to early crops. 



6. LIMAX BRUNNEUS, Drap. 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^l. 



7. VITRINA PELLUCIDA. Not uncommon. Our Berwickshire shell is 



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

 It is probably the V. Mulleri of Jeffreys. 



8. SUCCINEA AMPHIBIA. Common. A small variety, about three-tenths 



of an inch long, is also common in Berwickshire. It seems to be a 

 perfect shell ; and, in the places where it abounds, the larger shell 

 is not found. 



