LIMX.-EA GLABRA AS A SCOTTISH MOLLUSC 117 



such plants as could be found at that season, and these 

 I have submitted to Mr William Evans, who found them to 

 include Juncus articulatus L., J. conglomerates L., and 

 Potamogeton (probably nutans). Mr Nelson collected such 

 plants as could be reached, the Sphagnum in the marsh 

 being inaccessible. He observed that the young examples 

 of L. glabra were found almost invariably on the 

 Potamogeton, whether because it was the food plant or 

 merely because it was the most plentiful, he could not 

 say. He saw no other mollusca in the pond. The pool 

 is by the side of the Drum Road, 2\ miles S.W. of Falkirk 

 and 500 or 600 yards east of Greenrig Farm. On the north 

 side of the road at this point is a copse of birch trees and 

 bushes. The road is bounded by a hedge, immediately 

 inside of which is a stretch of boggy ground 30 by 10 

 yards in extent. At the west end of the marsh, at a gap 

 in the hedge, there has been dug, at some time, a hole 

 about 3 feet square, which is now 12 or 15 inches deep. 

 This hole may have been dug in order to provide in dry 

 seasons a supply of water for game birds. Apparently 

 there are springs about, for even in summer Mr Nelson has 

 never seen it dry, and the water is usually clear and fresh 

 looking. In this pond it is that the L. glabra lives 

 without any companion molluscs. In the pool itself are the 

 Potamogeton, Cinquefoil, and Bogbean, and in the surround- 

 ing marsh, Sphagnum, Rushes, and Grasses. Almost 

 opposite to this "glabra" pool is an old " lint-hole," called 

 by local botanists the Bogbean Pond. Unfortunately the 

 margin is very soft and the water inaccessible without 

 special preparations. It may be worth while to investigate 

 whether the species is here also. The whole area is at an 

 elevation of approximately 400 feet above sea-level, rolling 

 country, clayey soil, with peat in the hollows. The land 

 around is partly permanent pasture, partly arable, partly 

 woodland (principally Scots Pine). 



V.C. 87. Perthshire South. Mr William Evans found an 

 example, not full-grown, on the 20th April 1896, in a 

 pool on the north side of Duchray Water, near Aberfoyle. 

 There was at the time an element of doubt as regards this 



