i87 

 THE LAND AND FRESHWATER MOLLUSCA 

 OF SOMERSETSHIRE. 



By E. W. SWANTON. 



(Read before the Society, Nov. 9th, if 



Thirty-eight years have passed away since the appearance of the 

 only complete list — as far as we know — of the Land and Freshwater 

 Mollusca of Somersetshire (60). 1 Many local lists have been pub- 

 lished since that time (see Bibliography, at end), of which free use 

 has been made in compiling this catalogue. In the nomenclature I 

 have followed Collinge's " Catalogue of British Slugs," and the "List 

 of British Land and Freshwater Mollusca " published by the Concho- 

 logical Society in 1892. 



An asterisk preceding a species denotes its omission for Somerset 

 in the latest census list, as given in the second edition of Lionel E. 

 Adams' " Manual." 



Without the assistance of many kind friends this list could not 

 have been compiled, and I here take the opportunity of thanking 

 them; more especially Mr. Wm. Bidgood, of the Taunton Museum, 

 for kind loan of books ; the late Mr. Edward Wilson, of the Bristol 

 Museum, for much useful information respecting his beautifully 

 mounted collection of local shells ; also Messrs. W. Herridge, C. D. 

 Heginbotham, E. W. Bowell, and many others whose name are duly 

 appended to records made by them. 

 Arion ater L. — Generally distributed. 



Var. lamarcki Kal. (=ruber Moq.). — Bratton St. Maur. 



Var. violescens Mge. — Weston-super-Mare. 



Var. alba Fer.- — Gardens at the foot of West Hill, Wincanton 

 (W. Herridge). Last year I took a very beautiful variety from a 

 hedge in a lane at Stoke Trister, near Wincanton. Ground colour 

 yellowish-white, lineoles of a vivid orange, a broad black band 

 extended the whole length of the back, mouth and tentacles being 

 also black. 



Var. reticulata Roeb. — One example from Hatch Beauchamp, 

 near Taunton (Bowell). 



*A. subfuscus Drap., 1805. — Somewhat abundant in the woods 

 and hedgerows of the eastern part of the county. It is the Arion 

 flavus Miiller mentioned by Norman (60) as having been taken 

 " among the ruins of Walton Old Church, and likewise in Brockley 

 Coombe" ; and is doubtless generally distributed. Woods at 

 Butleigh, near Glastonbury ; Hatch Beauchamp, Taunton, " under 

 stones beneath Pinns sylvestris " (Bowell). 



1 The numbers in heavy type refer to the Bibliography at the end of the paper. 



