I.ANI> AND FRESH-WATKR MOLLUSCA Ol" I'.L'TK. 181 



A perusal of the foregoing List will, I think, show 

 that there is every likelihood of further research 

 being rewarded by the discovery of other additions 

 to the MolluscH of the island. Thus several aquatic 

 species — such as Spha'riu77i corneum, S. lacustre, 

 Valvata piscinalis, V. cristata, Flanorbis nitida, etc. 

 — may yet be found to occur in one or other of the 

 lochs or ditches. The Swan Mussel {Anodonta 

 cygncea) may also yet be discovered in some of the 

 lochs, as the conditions seem to be as favourable for 

 its existence— say, in Greenan Loch— as they are in 

 Lochend Loch, Edinburgh, where it is moderately 

 common. 



It maj- be noted here in passing, that Planorhis 

 cotnplanatus, which Haddin, when he read his paper 

 on the Bute Helicidse in 1869, recorded from Lochend 

 Loch as being an addition to the Scottish Fauna, 

 was previously known for more than thirty years 

 to be a common species in that Loch. The second 

 edition of JEj:carsi07is illustrative of the Geology and 

 Natural History of the Environs of Edinburgh, by 

 William Rhind, M.R.C.S., etc., published in Edinburgh 

 and London in 1836, contains a list of the local Land 

 and Fresh-water MoUusca, which includes the species 

 referred to, with the remark " Common ; Lochend." 

 It was thus recognised as a Scottish species long 

 prior to Haddin's record. 



Though, as has been pointed out, several aquatic 

 molluscs maj' yet be added to the fauna of Bute 

 few additions to the terrestrial species now recorded 

 are likely to be met with in the island. The follow- 

 ing, however, may yet be observed : Avion hoitensis, 

 Liniax Jiavus, Succinea elegans, Helix rupestris, Pupa 

 marginata, Bulimus obscurus, and Acme lineata. 



Sixty-one species and varieties are recorded in the 

 preceding list, and these, with one or two exceptions, 

 have all been certified by Mr. John W. Taylor^ 

 F.L.S., Leeds. 



