68 Proceedings of the Royal Irish Academy. 



It will be seen by the above lists that Praeger's sub-division of Ireland' 

 has been used in the present paper. For exhibiting the distribution of each 

 species in the country I have employed the device proposed by Praeger,- in 

 which symbols representing the names of the forty divisions are printed in an 

 order corresponding to their relative geographical positions, so that a glance 

 shows whether the range of a species is northern, southern, &c. The accom- 

 panying map (fig. 1) shows the forty divisions into which Ireland is divided, 

 and the letter — or number — symbols which may be employed to express them. 



The following species are additions to the list of Irish mollusca as 

 recorded by Dr. Scharff in 1892 ; the dates of their discovery and the names 

 of theu' recorders are added : — 



1894. Hyalinia helvetica Blum, Irish ISTat., iii, 45, E, A. Phillips. Since 



withdrawn from the Irish list ; see Irish Nat., xix, 210, 242 

 and 254, 1910. 



1895. Pisidium hibernicuyn Westerlund, Irish Nat., iv, 335, E. F. Scharff. 

 1897. Paludestrina jenhviisi Smith, Irish Nat., vi, 234, L. E. Adams. 



1907. Vitrina hibernica Taylor, Irish Nat., xiv, 225, J. W. Taylor. 



1908. Bithynia leacM Sheppard, Irish Nat., xvii, 1, E. Welch. 

 Limnaea praetenuis Bowell, Irish Nat., xvii, 45, Eev. E. W. Bowell. 

 Vertigo mouli'/isiana Dupuy, Irish Nat., xvii, 39, E. A. Phdlips. 

 Pisidium personatum Malm, Proceedings of the Malacological 



Society, vui, 124, B. B. Woodward. 



1909. Pcdudestrina, cmifusa Frauenfeld, Irish Nat., x\'iii, 143, E. A. Phillips. 



1910. Pisidiuvi steenbuchi MoUer, Proceedings of the Malacological 



Society, ix, 5, B. B. Woodward. 

 P. lilljehorgi Clessin, B. B. Woodward. Ibid. 



Another supposed species has been added to the Irish list — ^namely 

 Vallonia excentrica Sterki ; but for the present I am content to include this 

 shell imder the name of Vallonia pulchella, although Sterki's species has been 

 adopted by most conchologists in Great Britain. Mr. A. S. Kennard has also 

 described two new species of Hyalinia from material sent him from Ireland 

 H. hibernica [136] and IT. seharffi [137] ; but as some of us in Ireland regard 

 all the shells so named by Mr. Kennard to be racial forms of Hyalinia 

 cellaria MuUer, they are likewise omitted from the list of species. Of 

 the above list, Paludestrina jenkin-si, P. confusa, Vertigo movZinsiarui, and 

 Bithynia leachi are well-known and easily recognizable species. The 

 great majority of the others belong to critical groups. Vitrimi hibernica 

 is, of course, readily distinguished from our only other Britannic member of 



1 Irish Topographical Botany, 1901. ^ Irish Nat., xv, pp. 88-94. 1906. 



