Journal of Conchology, Vol. X. 



Plate III. 



MAP OF THE BRITISH MARINE AREA. 



The dark line shows the area taken into account in compiling the Society s List 

 of British Marine Mollusca. It is bounded as follows : — 



South — By latitude 49° 30' N. , which parallel passing eastwards terminates at 



longitude 5°o' W. , or midway between the Land's End and Brest. Thence 



mid-channel is followed except for a detour to include the Channel Islands, 



until latitude 51° 50' N. is reached off the east coast. 

 Eas/ — From latitude 51° 50' N. , longitude 2° 30' E. is taken as the eastern 



boundary northwards. 

 North — Latitude 60° o' N., coming from the west as far as longitude 5" o' W. , 



thence due north-east to longitude i°o'W. , thence due east to meet the 



eastern boundary at 2° 30' V.. 

 IVest — The contour line at the base of the continent at 1,500 fathoms, until this 



meets the meridian 20° W. longitude, which is followed northwards to 



60° N. latitude, where it meets the northern boundary. 



