JOURNAL OF CONCHOLOGY. 27 



DESCRIPTION OF A NEW VARIETY OF LIMAX 

 AGRESTIS. 



By J. DARKER BUTTERELL, Beverley. 



[Read before the Conchological Society.] 



During the past few months I have met with specimens of 

 a black form of our common field-slug, which does not appear 

 to be described in Moquin-Tandon's or any other work to which 

 I have access. I will therefore characterize it as follows: — 



Limax agrestis var. nigra n. v. Animal jet-black, tentacles 

 bluish or brownish-black, under side of foot somewhat 

 paler in hue. In every other respect the shell and 

 animal agree with the type. 



Mucus milky. 



Inhabits gardens, perhaps more particularly affect- 

 ing pansy-beds, Beverley, J. D. Butterell and F. Boyes, 

 1882. Also found at Raskelf in 1882, W. Denison 

 Roebuck; and some years ago in a wood near Tad- 

 caster, F. G. Binnie. 



Where found there are generally also intermediate 

 specimens more or less blotched with black. 



If placed in liquor potassse the black colour is 

 discharged, and the animal assumes an uniformly rich 

 brown tint. 



Helix lapicida var. albina near Bristol. — An amateur 

 collector some time ago found a white Helix lapicida near Leigh 

 Court. I saw the shell and identified it. I have been myself 

 to the locality but could find none — not even the type. — (Miss) 

 F. M. Hele. 



