GASTEROPODA. 
303 
Genus Auricula. 
A. denticulata, Mont. (sp.). 
Bangor, Miss A. M‘Adam ; 
Youghal, Miss M. Ball ; 
Portmarnock, Mr. Warren. 
A. bidentata, Mont. (sp.). 
General along the coasts of Ireland. 
A. fusiformis, Turt. (sp.). 
Mr. Alder, on examination of a shell from Portmarnock, in Mr. War- 
ren’s collection, agreeing with the description of Voluta fusiformis, was 
disposed to believe it worthy of specific rank : a similar shell was obtain- 
ed at Bundoran by Mrs. Hancock. 
Family Limnteadje. 
Genus Limneus. 
L. auricularius, Drap. 
Through deference to those who have paid much more attention to the 
subject than myself, I note this Limneus under the head of a distinct spe- 
cies, although I am disposed to believe that it is only an extreme form of 
L. pereyer. The L. auricularius, as figured in both editions of Turton’s 
Manual, and by Draparnaud, is not very unfrequent in Ireland, but of 
the extremely expanded form represented by Bossmassler is very rare, 
and from one or two still ponds only, abounding in subaquatic plants of 
various species, have I seen it. Pfeiffer’s figure (part i. t. 4, f. 17, 18) 
is somewhat intermediate between those just mentioned, and correspond- 
ing to it I have procured specimens. All forms, from the ordinary L . 
pereyer to the L. auricularius, it seems to me, may be closely traced blend- 
ing into each other — reference to the figures in many works will be found 
to present various forms, though in all the aperture is greatly expand- 
ed. Some specimens of X. auricularius, which I collected in Stow Pool, 
Lichfield, in July, 1836, are more distinct than any which I have seen 
represented ; the spire is more minute, and the upper part of the outer 
lip goes off from the body of the shell in the form of a straight line ; 
but of all the individuals obtained on this occasion no two are pre- 
cisely alike, but vary from the extreme form described to the L. ovatus, 
Drap. 
L. pereyer, Drap. 
This species, presenting 'endless variety, is abundant throughout the 
waters of Ireland, from the smallest drain to the vast expanse of Lough 
Neagh. Some of the forms which have been considered as distinct spe- 
cies may be enumerated as occurring in this country, as X. ovatus, Drap., 
X. intermedia, Michaud (Comp. pi. 16, f. 17, 18), X. maryinata, Mich. 
(Id. f. 15, 16), X. lineatus, Bean, X. acutus, Jeffreys — of these two last I 
judge from comparison of authentic specimens, the former favoured me 
by Mr. Alder, the latter by their describer. One variety seems to require 
especial notice — the Gulnaria lacustris, Leach. On the shores of Loughs 
Neagh and Erne I have collected specimens identical with those so named 
by Dr. Leach in the British Museum, and which are from the lakes of 
