TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 170 
| XVIII. 
ON THE LAND AND FRESH-WATER 
MOLLUSCA OF BUTE. 
BY THOMAS SCOTT, F.L.S., NATURALIST TO THE FISHERY 
BOARD FOR SCOTLAND. 
With Map [Plate IT.]. 
[Read 25th March, 1890.] 
In 1869, Mr. William Haddin published in the 
Proceedings of this Society his paper “On the 
distribution of the Helicide in Bute and in the 
vicinity of Largs.” Since then little further appears 
to have been done towards working up the mollus- 
can fauna of that interesting island. The references 
_ to Bute in the List of the Land and Fresh-water 
Mollusca in The Fauna and Flora of the West of 
Scotland (1876), p. 40, are made chiefly on the 
authority of Haddin’s records, so that for over 
twenty years these records have contained the 
fullest account we possess, and afforded our principal 
source of information, regarding the Bute Mollusca. 
A perusal of Mr. Haddin’s paper shows that con- 
siderable care was taken in its preparation so that 
it might be as exhaustive as his opportunities for 
observation would allow, and it must be acknow- 
ledged that his efforts were fairly successful. 
Unfortunately, however, no attempt appears to 
have been made by him to work up either the 
fresh-water species or the Limacidaw; and that is to 
be regretted, as the fresh-water conditions of the 
island seem to be very favourable to the existence 
of aquatic molluscs. 
My object, therefore, in preparing these notes is 
to try to fill up in some measure the gap left by 
Mr. Haddin, as well as to revise his list of the 
