198 Mr. W. Thompson’s Catalogue of the Land and 
(county Waterford), it is stated by Mr. R. Ball to be found!. The 
form to which M. Michaud has applied the name of Unio Roissyi is 
common to several localities in Ireland. 
The following Catalogue at the same time exhibits the number of 
British species which Ireland possesses, and according to the pre- 
sent state of our information, those likewise in which the country 
is deficient. In the Table, the columns headed ‘ elsewhere in 
north,” &c. are used only with reference to species not enumerated 
in the preceding column or columns, and to show that geogra- 
phical position is not the cause of absence; thus, for instance, 
Heliz virgata is not found about Belfast, but occurs in the north 
of the county of Antrim. The genera Arion and Limaz were al- 
together omitted in most of the Catalogues supplied me. The 
Catalogue for Belfast? is on my own authority : Dublin, various ; 
Limerick and Miltown Malbay, William Henry Harvey, Esq. ; 
Cork, Mr. John Humphreys (1834) and the Rev. Thomas Hincks 
(1840)—the species added by the latter gentleman are marked 
thust; Youghal (county Cork), Miss Mary Ball; La Bergerie near 
Portarlington (Queen’s county), Rev. Benjamin J. Clarke; Fin- 
noe near Burrisakane (Tipperary), Edward Waller, Esq. 
mo S North. }| East. West. South. [central p 
Le yf . 2 - . = . ag c 2 - 2c Cy 
+! oO ow “< mH 43 a oper * 
pe B/E) 2212/25 ]5/ 82 /28]2 222/48] 2 
ae 1g) 2212) Sal elee | BE S| 3 sti els 
as Biase | as peed © 
1 |Neritina fluviatilis ......... 1 se Ps aT |« + 
2 |Assiminea Grayana 
3 |Paludina vivipara ......... 2 be & 
4 achatina 
5 ——+tentaculata(P.impura) 3 * * * eT * * Ix 
6 ventricosa 
7 |Valvata piscinalis ......... 4 |y " * se en ye 
8 cristata (V. spirorbis)|5 | y se] cee Pa] coe | coe ExPlece] eee Boe Be 
QD {ATION BEF ..sccccccsecceece. 6 |x re 4 eee] r 
10 Hortensis .ecseseeeees 1 AS oo flees ee * 
1] |Limax maximus ............ o +e * x bool * 
12 flavus (L. variegatus)|9 | noe soe] * 
13 |—— carinatus .........06 1Q Joao] soe Jove] coe feos} coo | ge Poselecs * 
14 | —— AQTESTIS 2. .eceecseceee DL bg [ocd Big t cee Bid cee Fe oe pm 
15 brunneus 
1 Unio pictorum is noticed by Dr. Turton, in his ‘ Catalogue of Irish 
Shells,’ as found in “rivers about Cork.’””? The species is not known as na- 
tive to my correspondents in the south, and I am disposed to believe was er- 
roneously inserted in the catalogue. 
? All the species marked with an asterisk in the column headed “ Bel- 
fast” have been obtained within four miles of the town. 
3 The prevailing geological features of the neighbourhood of Belfast are 
trap, chalk, greensand formation, variegated marl formation and grauwacke ; 
of Dublin, mountain and calp limestone, granite and quartz-rock ; of Li- 
merick, Cork, and Youghal, ‘‘ limestone and old red sandstone” (Griffith) ; 
of Miltown Malbay, ‘“ coal-shale and sandstone” (Griffith) ; of La Bergerie 
and Finnoe, mountain limestone. 
