JOURNAL OF CONCHOLOGY. 265 



P. punctata var. cingulata Marsh. Having the same trans- 

 parent zone across the middle as the last variety. It occurs 

 very sparingly with the type at Guernsey, 20 fathoms ; 

 Scilly, 40 fathoms ; Sennen Cove, Land's End ; Borough 

 Island, S. Devon; Killala Bay; Portrush ; Sutherlandshire; 

 Minch off Barra, 53 fathoms. Not the P. cingidata ot Sars. 



Pleurobranchus plumula var. alba Marsh. Pure white. 

 Fifty per cent, of my Jersey specimens are white, and it no 

 doubt occurs elsewhere, as Jeffreys states that the shell is 

 'rarely milk-white.' 



Assiminea littorina var. albida Sykes. Clear white. Wey- 

 mouth. See 'J. of C for Jan., 1890). Found occasionally 

 with the type at Torquay, Portland, and Weymouth. 



Sevenoaks, Torquay, 



October, 1892. ♦•♦♦♦ 



Note on Helix pisana in the Channel Islands. — 



This snail is abundant in some spots close to the sea on the 

 south coast of Jersey. It lives there on the Wild Radish {Ra- 

 phanus raphanis4ruin L.), and the Wall-flower [Cheirantkus 

 cheiri L.), two plants which flourish in the sandy fields near the 

 shore. All the examples of Helix pisana found there were 

 typical. Near Vale Castle, in Guernsey, there was a colony of 

 this species on the edge of a cultivated field. These snails 

 were living on a thistle {Carduus pycrwcephalus L.) and were 

 all very pale in colour, most of them being the var. alba. Had 

 the food-plant in this case anything to do with the lack of 

 colour? A thistle, one would suppose to be an uninviting plant 

 to a snail, and just across the road (opposite Vale Castle), there 

 were plenty of Wild Radishes, but no H. pisana to be seen 

 on them. Does this snail only live for one season ? The ex- 

 amination of about two hundred living examples at the end of 

 May, 1893, failed to produce one shell with the lip fully formed, 

 though many of the dead shells lying about were full-grown. — 

 J. E. Cooper, 93, Southwood Lane, Highgate, N., 20th July, 

 1893. (Read before the Conchological Society, 26th July, 1893). 



