W. SHONE OK THE GLACIAL DEPOSITS OF WEST CHESHIRE. 



393 



Analysis of the principal Collections of Shells from the Drift of 

 Lancashire and Cheshire, also Moel Tryfaen. 



Arctic and Scandinavian species not as 

 yet admitted to be inhabitants of Bri- 

 tish Seas (authority J. Gwyn Jeffreys 's 

 ' British Conchology ') : — 



Leda pernula 



Astarte depressa (crebricostata) 



borealis 



Tellina calcarea 



Dentalium striolatum 



Natica affinis 



Admete viridula 



Fusus despectus 



Trophon clathratus, var. scalariformis 



, var. Gunneri 



Fabricii 



Pleurostoma pyramidalis 



striata 



Northern type of British 

 habit Arctic and 

 common with our own : — 



Mytilus modiolus 



Oyprina islandica. . . . 

 Astarte compressa . 



compressa, var. 



Saxicava norvegica 



Lacuna divaricata 



Natica groenlandica : 



Trichotropis borealis 



Buccinum undatum 



Trophon barvicensis 



clathratus, var. truncata 



Fusus islandicus 



gracilis 



propinquus 



Pleurotoma rufa ... 



turricula 



Trevelyana 



which in- 

 Seas in 



Southern type of British species which in- 

 habit more southern seas in common 

 with our own : — 



Area lactea 



Venus chione 



Natica sordida 



11 



3° 

 If 



I * 



OQ 



Middle Sands 

 G-ravels. 







3* 



2^ 



O 02 



^l3 







rf3 



s ^ 



O <D 



ft 



Upper 

 Boulder- 

 clay. 



o 2 



f-l r-t 



vr 



a 



f 



f 



vr 



vr 



vr 



f 

 c 

 r 



vr 



vr 



f 



f 

 r 



vr 

 r 



10 



Q. J. G. S. No. 134. 



2d 



