NOTES ON BRITISH MOLLUSCAN DISTRIBUTION. 1 79 



53. Lincolnshire South ... — i — i i 



Divided from North Lincoln by the 

 Witham from its mouth at Boston to 

 Lincoln, thence by the Foss Dyke to 

 the border of Nottinghamshire. 



54. Lincolnshire North ... 2 8 12 22 52 



55. Leicester and Rutland... — 4 — 4 9 



Includes a detached portion of 

 Derbyshire. 



56. Nottinghamshire ... ... — 



57. Derbyshire ... ... — 



A detached portion is included with 

 Leicester and Rutland. 



58. Cheshire ... 



59. Lancashire South ... — 



The River Ribble separates this 

 division firom the next. 



60. Lancashire West ... ... — 10 9 19 35 



The Furness district of North 

 Lancashire is included with West- 

 moreland. 



61. Yorkshire South-East... 5 28 30 63 261 



This is the East Riding of York- 

 shire. 



62. Yorkshire North-East ... 6 34 25 65 299 



Divided from N.W. Yorkshire by 

 the Rivers Wiske and Swale. 



63. Yorkshire South-West 3 37 38 78 564 



Equivalent to the Southern division 

 of the West Riding. Divided from 

 Mid-West Yorkshire by the Leeds and 

 Liverpool canal and by the river Aire 

 below Leeds. 



64. Yorkshire Mid-West ... 8 51 37 96 1464 



Equivalent to the Northern portion 

 of the West Riding minus the Dent 

 and Sedbergh district, which is in- 

 cluded with N.W. Yorkshire. 



65. Yorkshire North-West 4 36 21 61 369 



Equivalent to the Western half of 

 the North Riding with the addition of 

 the Dent and Sedbergh district of the 

 West Riding. 



