Geographical Distribution of Molliisca. 317 



Type of Woodlands. 



1. Ash Wood Formation. 



A — Damp Ash Wood. 



Aa — Substituted Beech Wood. 



B — Dry (Copse, Pavements, etc.) 



2. Oak-Birch Wood Formation. 



A — Damp. 



B — Dry and Heathy. 



Note. — In this paper we have adopted the nomenclature 

 of the Conchological Society's List of the British Non-marine 

 Mollusca (1904) with the exception of preferring Pupa for 

 Jaminia as the generic name of this group. 



COASTLANDS. 



§ I. Salt Marshlands. Sub-halophile. 



(a) — Inner zones (or Reed-formation). 



Paliidestrina stagnalis Baster. Associated with Littorina 

 rudis Maton. 



A species existing in countless numbers all round More- 

 cambe Bay, in brackish pools at and above high-water mark. 

 The L. rudis is the form known as var. tenehrosa Mont., as usual 

 in brackish waters. 



[h) Transition to Fresh-water Marsh. Sub-halophile. 



Here the soil-water is at most times fresh, rising from land, 

 though at the periods of very high tides it is brackish. 



Succinea oblonga Drap. Associated species :• — 



Land. 



Agriolimax IcBvis MiiU. 

 ,, agrestis L. 

 Avion circumscriptus Johnston 

 Vitrea radiatiila Alder. 

 Punctum pygmcBiirnDTap. 

 Hygroniia hispida L. 

 Cochlicopa lubrica Miill. 

 Vertigo pygnicea Drap. 



Carychium mininum MiiU. 

 Succinea elegans Risso (rare) 



Water. 



Limncsa pereger Miill. 



,, truncatula Miill. 

 Aplecta hypnorum L. 

 Pisidium pusillum Gmel. 

 ,, obtusale Pfeiffer. 



This rare and local species occurs in great abundance near the 

 estuary of the River Winster, at Meathop and toward? Grange- 

 over-Sands. In the heat of summer it is to be found at the 

 bottom of the damp drains which intersect the meadows. 

 It is also to be found sparingly among the stones bounding the 

 marshy land, where, in company with Limncea truncatula, it 

 seems able to exist with a minimum of moisture. It occurs 

 in N. Devon about the dune-marshes of Braunton Burrows, 



igog Sep. i. 



