194 Guide to Belfast. 



The following 21 species, which are found in other parts 

 of Ireland, are absent from Antrim and Down; they are 

 mostly confined to the southern counties or some limited 

 areas on the Great Central Plain : 



Hyalinia helvetica, Bhun. Succinea oblonga, Drap. 



H. excavata, Bean. Otina otis, Turt. 



Geomalacus maculosus, Allman. Limncca involuta, Harvey. 



Testacella maugei, Fer. L. glabra, AIull. 



T. haliotidea, F. Big. Planorbis corneus, L. 



T. scutulum, Sow. P. vortex, L. 



Helix pisana. Mull. Neritina fluviatilis, L. 



Ccecilianella acicula, Mull. Pisidium globulare, ]]'est. 



Vertigo minutissima, Hartin. P. henslowianum, Shepp. 



V. moulinsiana, Diip. P. hibernicum, West. 



Clausilia laminata, Mont. 



Limmra glabra and Paliidina vivipara are excluded from 

 the district list, and the latter also from the Irish, with some 

 species recorded on insufficient evidence (see Scharff's notes, 

 op. cit.). The usual varieties of most species occur, and 

 though true albinos are excessively rare, colonies containing 

 a fair proportion of white-shelled forms of Fiipa anglica, 

 P. cylindracea, P. muscorum, Clausilia bideiitafa, and Acme 

 lineaia, with a few Helix rotundata, are found on the north 

 coast of Antrim. A small high-spired form of Helix 

 nemoralis is plentiful at Killard Point, Co. Down. 



References. — Thompson : Natural History of Ireland, iv, 1856. 

 Tate : Land and Freshwater Mollusks of Gt. Britain, 1866. Scharff : 

 The Irish Land and Freshwater Mollusca, Irish Naturalist, i, 1892. 

 Additions, ibid., iv, p. 335. and per Phillips, iii, p. 45. ADAMS: Manual 

 of British L. and F.W. Shells, 1896. Adams: L. and F.W. Mollusca 

 Ball3'castle District, h-ish Naturalist, vi, 1897, p. 179 ; also see vii, 1898, 

 p. 82. Standex : The Land Mollusca of Balh'castle and District, Irish 

 Naturalist, vi, 1897, p. i. W'elch : County Records, Journ. op Conch., 

 ix, p. Ill, 



R. W. AND H. L. O. 



