86 



NOTES ON SOME ANGLESEA LAND AND FRESHWATER 



MOLLUSCA. 



By CHARLES OLDHAM. 



(Read before the Society, December 4th, iE 



In the early part of July, 1895, I spent a short holiday at Cemmaes, 

 a small village on the north coast of Anglesea, about five miles west 

 of Amlwch, devoting some of my leisure to the investigation of 

 the land and freshwater shells of the district. Most of my collecting 

 was done close to Cemmaes village, but I visited two sheets of water, 

 Llynfelinant and Llynllygeirian, which lie some three miles inland. 

 The results, however, were somewhat disappointing, as their stony 

 beds and the consequent lack of aquatic vegetation make them ill- 

 suited to the requirements of freshwater mollusca. 



The whole of the northern part of Anglesea is composed of 

 metamorphic rocks of chlorite, mica-schist and gneiss, with small 

 quantities of greenstone and serpentine. Limestone occurs close to 

 Cemmaes and is quarried in places between the harbour and Llan- 

 badrig church. The country is almost entirely treeless and, where 

 not under cultivation, is occupied by gorse-covered commons. A 

 snipe-bog near the sea, about half-a-mile west of the village, proved to 

 be the best collecting ground, and yielded Carychium and various 

 species of Hyalinia and Vertigo in considerable numbers. 



The weather was hot and dry during my visit, and had been so for 

 some time previously. Such species as H. virgata and H. acuta were 

 consequently difficult to find, but, had the conditions been more 

 favourable, other forms would doubtless have been secured, and my 

 total of fifty-three species would probably have been greater. 



Mr. J. W. Taylor has kindly looked over the shells collected and 

 has confirmed my identification of the various species. 



Arion ater. — Very common. 



Var. brunnea. — Common on roadsides and hedges. 

 Var. plumbea. — Several in a ditch near the village. 

 Var. pallescens. — Several specimens with the last-named variety. 



A. subfuscus. — One under a stone in the village. 



A. minimus. — Plentiful in a wet place on the cliffs. 



A. circumscriptus. — Several in fields near the village. 



Amalia gagates var. plumbea. — One in a garden at Cemmaes. 

 Var. rava. — One at the foot of a wall near the village. 



Limax maximus var. ferrussaci. — Two in a garden at Cem- 

 maes ; one in Llanbadrig Churchyard. 



Var. fasciata. — Several in a garden at Cemmaes. 



