248 PROCEEDINGS OF THE 



however, although I have not been able satisfactorily to distin- 

 guish between Z. 'purus and Z. crystalliniis. The species of most 

 frequent occurrence are Z. alliarius, Z. cellarius, and Z. crystalliniis. 

 Zonites fulvus seems to be widely distributed, though two speci- 

 mens seldom occur together. It is to be found under stones in 

 grassy pastures — Chapelton, and meadows — Bute. Z. radiatulus 

 I have found but seldom among leaves in wooden glens — Chapel- 

 ton, Bute, and Brisbane Glen, Largs. Beneath stones on the 

 banks of Loch Ascog and Greenan Loch, Bute, Z. nitidus may be 

 found. It does not appear to inhabit the Glasgow district. Z. 

 nitidulus, though not mentioned in Mr Dougal's list of specimens 

 found within ten miles of Glasgow, I have taken in Calderwood 

 Glen, as well as at Woodend, Bute. Z. exeavatus is the rarest 

 species of the genus, and appears to be peculiar to Britain. In 

 the autumn of 1867, I took a single specimen amongst leaves at 

 Chapelton, Bute. Though I sought often there, I was not suc- 

 cessful in finding another till last summer, when my search was 

 rewarded by the discovery of numbers in an uncultivated field 

 above Ardbeg Point. This is the most northern locality for this 

 shell, so far as I know.* 



Of the numerous species of Helices found in Britain, more than 

 half the number are found in Bute. Helix aspersa may be taken 

 in countless numbers on the coast line. I remember a wall on 

 the shore at Mount Stuart which was literally covered with this 

 mollusk. In tlie gardens there it is the most destructive snail. 

 It is remarkable that around Glasgow it should be almost un- 

 known. //. nemoralis is a common shell, both inland and on the 

 coast. From Mount Stuart to Kilchattan Bay it may be found in 

 quantities, where the one and the five banded varities appear to 

 prevail to the exclusion of all others. H. hortemis I have never 

 found in Bute, even after repeated searchings. Its great scarce- 

 ness, compared with the abundance of nemoralis, is a fact worthy 

 of note. H. arhudorum in Bute occurs but sparingly, and that in 

 the woods behind Kamesburgh, while in Gogo Glen, Largs, it is 

 by no means scarce. H. caperuta is found on the coast generally 

 distributed. It occurs also on the banks of Greenan Loch. At 

 St Ninian's Bay, Bute, //. ericetorum lives in company with the 

 beautiful little H. jyulcheUa on the sandy shore. This appears to 



* This species I have lately taken on Ben Nevis, Argyleshire, 1869. 



