NOTES ON BRITISH MOLLUSCAN DISTRIBUTION. 





66. Durham ... 



The detached portions are uicluded 

 with Northumberland and Cheviot- 

 land. 



67. Northumberland South 



Includes a detached portion of 

 Durham, and is separated from 

 Cheviotland by the river Coquet and 

 a line continued to Carter Fell from 

 the Linn Bridge. 



68. Cheviotland 



Equivalent to North Northumber- 

 land plus a detached portion of 

 Durham. 



— 5 



— 4 — 



Dumbartonshire. 



87. Perth West & Clackmannan 



Separated from Mid-Perth by the 

 line of v^ratershed which divides the 

 tributaries of the Tay from those of 

 the Forth. 



J.C, iv., April, 1884. 



