25 
THE LAND AND FRESHWATER MOLLUSCA OF 
MAYO AND SLIGO. 
By Amy WARREN. 
So Far as I am aware, no catalogue of the Mollusca of these 
counties has been published, and, as local lists from remote 
districts are always interesting to naturalists, I have ventured to 
send you the following catalogue of the shells I have collected in 
this part of Ireland. The area that I have hitherto worked has 
been very limited, extending only a few miles into either county 
from Ballina. I am the more induced to forward it, short as it 
is, in the hope that other conchologists who may have collected 
beyond this area may help to complete the catalogue by sending 
to ‘The Zoologist’ the result of their researches. 
The nomenclature and arrangement which I have adopted is 
that of Mr. Gwyn Jeffreys, who has very kindly named some of 
the specimens for me. J must also express my acknowledgments 
to Mr. A. G. More for having obligingly assisted me in deter- 
mining some of the rarer forms. 
I. TERRESTRIAL MOLLUSCA. 
UNIVALVES (GASTEROPODA). 
Fam. Limacip2. 
Arion ater. The Black Slug.—Common everywhere. 
A. hortensis. The Garden Slug.—Very common in gardens. 
Limaz gagates. The Brown Slug.—Common in the garden 
here at Moyview. During the rainy weather of the past autumn 
I got several on the cabbages. Mr. Norman has given a very 
good description of this slug in ‘The Zoologist’ for 1853, and has 
remarked that when at rest it assumes a more rounded form than 
any other member of the genus, contracting and squeezing itself 
into so small a compass that its height is but little exceeded by 
its length. Its slime is thick and glutinous, resembling varnish. 
L. marginatus. Sowerby’s Slug.—I have found three examples 
of this slug in the woods at Moyview. 
L. agrestis. The Field Slug—Is only too abundant. It 
caused great destruction in the oat-fields this year, cutting down 
the young plants in vast quantities. 
E 
