io8 The Irish Naturalist. 



Dundrum, it is plentiful. Thompson (15) never met with this species in 

 the north, but records it from Kildare, Queen's County, and Cork. 



Foreign Distribution. — Great Britain, Germany (only at Weimar 

 and the Island of Alsen), Belgium, France, north of Spain and Portugal, 

 and Madeira. 



Helix ericetorum, MUller. 

 I. II. III. IV. V. VI. VII. VIII. IX. — XI. XII. 



On the west coast this species is very abundant in many localities, and 

 it varies greatly in size and colour. The Irish form differs so much from 

 the continental one, that Dr. Westerlund, to whom I sent specimens 

 from the Aran Islands, referred them to a new species, H. lampra. I quite 

 agree, however, with Prof. Boettger who looks upon the Irish form as a 

 variety of the typical H. ericetorum. 



Foreign Distribution. — Great Britain, France, central and western 

 Germany, Switzerland, Corsica, Spain, Portugal, north Italy, Turkey, and 

 Algiers. 



Helix acuta, MUller. 

 I. II. — IV. V. — VII. VIII. IX — XI. XII. 



Thompson (15) and also many English writers place this species under 

 the genus Bulwius, but its habits and the structure of the animal and 

 shell are much more HclixASk.^, and it is classed under that genus by the 

 best continental authorities. It is very common in many localities along 

 the coast, especially on the north side of Dublin. 



Foreign Distribution. — Great Britain, France, Italy, Spain, Portugal, 

 Morocco, Algiers, Sicily, Malta, Corsica, Cyprus and Crimea. 



Helix nemoralis,M tiller. 

 I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. 



This is one of the commonest and also one of the most beautiful of Irish 

 mollusca. Yellow or red, with or without bands, are the commonest 

 varieties. In many places on the west coast there is a race of very large 

 forms of this species, for instance on Valentia and on the Aran Islands, 

 and a now extinct race of large and very thick-shelled white forms lived 

 not long ago at Roundstone in Connemara. 



Foreign Distribution. — Great Britain, Germany, southern Scandi- 

 navia, Illyria, Dalmatia, Western Austria, Switzerland, north Italy, 

 France, Spain and Portugal. 



Helix hortensis, MUller. 

 I.? — III..? IV. V. - VII. VIII. — X. XI..? XII. 



This is much less common than H. neT?ioralis. The H. hybrida, Poir. 

 mentioned by Thompson (15) must be looked upon as a variety of this 

 species. 



Foreign Distribution. — Great Britain, France, Portugal, Germany, 

 central and southern Scandinavia, Iceland, Faroe and Shetland Isles, 

 Finland, Bohemia, Austria, Switzerland, Greenland, and north eastern 

 portion of North America; also on islands between Newfoundland and 

 Cape Cod. 



Helix aspersa, MUller. 

 I. II. — IV. V. — VII. VIII. IX. X. XI. XII. 



Although in southern Europe we find several well-marked varieties, this 

 species remains remarkably constant in its characters in Ireland. It is 

 the largest of our land-shells and one of the commonest, at least all 



