250 PROCEEDINGS OF THE 



long-looked-for prize, amongst stones just above tlie high water 

 mark — a situation most unusual for it, so far as I can learn.* 



In Mr Dougal's paper already referred to, Balea perversa is 

 mentioned as an apparently rare inhabitant of Aucheutorlie Glen, 

 Bowling. On the rocks at Bell's Monument I took a number of 

 specimens of this shell lately. At St Ninian's Bay, Bute, it is to 

 be found in colonies, adhering to stones in a loosely built wall on 

 the shore. Under tlie loose bark of trees, chiefly ash, in many 

 parts of the island, and on high elevations on the hills behind 

 Largs, I have likewise taken it. 



Clausilia rugosa is common on the trunks of trees, especially 

 beech, and on mossy walls. Beautiful specimens occur on an 

 old wall at Mount Stuart House. 



Succinea ]}utris is not rare on the banks of the lochs throughout 

 the island. In brackish pools, near St Ninian's Bay, it seems to 

 thrive well. 



It will be observed, from the preceding remarks, that I have 

 not been able to record a single species from the banks of Loch 

 Fad, while on the shores of Loch Ascog and Loch Greenan are 

 found Zonites nitidus, Helix caperata, Vertigo anfivertigo, y. edentula, 

 and Succinea pitfris. The reason of this I would not venture to 

 affirm, but it is a ftict worthy of note, that the banks of the former 

 are formed of shale, while those of tlie two latter are of sand. 

 The uncultivated districts, such as Chapelton, the old woods of 

 Mount Stuart, and the coast line, are found to yield many more 

 species than the cultivated parts. 



Three species occur at Largs, which do not seem to have found 

 their way over to Bute, viz., Helix sericea, Fupa miiscorum, and 

 J''ertigo 2)ygmcea. 



In comparing the Glasgow District with the one under con- 

 sideration, it is observed that two species occur in the former 

 which are absent in the latter — Helix hortemis and Bulimus 

 obscurus; while peculiar to the latter we have Zonites nitidus, 

 Z. excavatiis, Helix ericetorum, H. sericea, Piqxi mnscorum, P. unglica. 

 Vertigo antivertigo, V. edentula, and V pi/gmcea. I would call 

 attention to the fact that at Bowling the distribution of many of 

 the species occurring on the coast seems to stop short, viz., Helix 

 aspersa, H. rufesccns, H. fusca, and Balea perversa. 



* Vertijo pi/jmcea I have since found on the banks of Loch Ascog, Bute, thus 

 reducing the specieB found at Largs only, and not in Bute, to two. 



