170 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



XVIII. 



ON THE LAND AND FRESH-WATER 

 MOLLUSC A OF BUTE. 



BY THOMAS SCOTT, F.L.S., NATURALIST TO THE FISHERY 

 BOARD FOR SCOTLAND. 



With Map [Plate II.]. 

 [Read 25th March, 1890.] 



In 1869, Mr. William Iladdin published in the 

 Proceedings of this Society his paper "On the 

 distribution of the Helicidse 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 Limacidaa ; 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 



