13^ 



THE NON-MARINE MOLLUSCA OF LLANDUDNO 

 AND DISTRICT. 



(Continued from p. 132). 



By H. BEESTON. 



(Read before the Society, March 14th, 1917). 



Helicella virgata (Da Costa). — Very abundant. With H. barbara 

 this species is fairly ubiquitous all over the Llandudno 

 peninsula. Near the sea it is rather small, but inland it 

 attains a larger size, although on the sand-hills and golf- 

 links of the Conway side of the Morfa it seems to thrive 

 better and grow larger than on the opposite side, possibly 

 owing to food being more plentiful, and the situation more 

 sheltered. Away from the peninsula the species is not so 

 prolific and often smaller. Other localities : Llandrillo, 

 Llangwystenin. The following varieties were noted : — 

 var. pellucetis Sh. '^ Great Orme, near the disused 



var. roseozonafa (?) V copper mines, golf-links, Con- 



var. minor Taylor J way shore, 



var. lutescens Moq. - Conway Road, 



var. leucozona Taylor ^ 



var. albicans Grateloup \ Golf-links and sand dunes, 

 var. iessellata B.-Ch. J 



var. subalbida Poiret 

 var. hyalozona Moq. 

 var. hypozotia Moq. 

 var. stibmaritima DesMoul. 

 var. ochroleuca Moq. 

 m. sub scalar if or me 

 In igoi there was quite a number of this monstrosity, but by 

 191 5 it seemed to have almost died out. 



The light-coloured forms mentioned by Mr. Roebuck in 1883 — 

 those I have named roseozonata — still persist and are the predominant 

 variety after thirty-one years. The shells vi;ith black bands, i.e., type 

 form, are also quite common. 



Helicella itala (Linne). — Extremely rare even if existent (1915). 

 There seems to be something very curious about the occurrence 

 of this species at Llandudno. In 1884 {Journ. of Conch., vol. iv, 

 p. 200) Mr. Roebuck says : — " I am rather surprised that in a lime- 

 stone district like that around Llandudno I did not meet with more 

 forms. I had quite anticipated finding such things as Helix erice- 



Conway shore. 



