104 ANNALS OF SCOTTISH NATURAL HISTORY 



Leueiseus rutilus. THE ROACH. Is abundant in the White 

 Loch of Inch, near Stranraer. 



Leueiseus phoxinus. THE MINNOW. Is not found in any 

 streams in Galloway, west of the Cree, except where it has recently 

 been introduced in Glasserton parish. 



Salmo ferox. Mr. Service follows other icthyologists in dis- 

 tinguishing Salmo ferox as a distinct species. Is there any true 

 specific difference between the Great Lake Trout and large Salmo 

 fario ? The largest trout I can remember being killed in Galloway 

 was one of 13 Ibs. in Loch Dee, about the year 1870. There 

 is a plaster cast of it at Galloway House. In 1890, I killed five 

 trout in Loch Arkaig in the course of one afternoon. They weighed 

 17^ Ibs., 8 Ibs., 5 Ibs., 2\ Ibs., and 2 Ibs. As they were all taken by 

 trolling they were all called ferox; but I doubt not had the smaller 

 ones been taken with the fly, they would have been regarded as 

 ordinary loch trout. 



[Dr. Gtinther ("Study of Fishes," 1880, p. 633) remarks that a 

 "wide spread species, however, like S. fario, when it inhabits 

 a small mountain pool with scanty food, may never exceed a 

 weight of eight ounces, whilst in a large lake or river, where it 

 finds an abundance and variety of food, it attains to a weight 

 of fourteen or sixteen pounds. Such large River- trout are 

 frequently named and described as Salmon-trout, Bull-trout, etc." 

 Dr. Day ("British and Irish Salmonidfe," 1887, p. 193) con- 

 siders Salmo ferox simply a large, probably an old, common 

 trout (S. fario), and treats it as a variety of that species. 

 EDS.] 



ADDITIONS TO THE AUTHENTICATED COMITAL 

 CENSUS OF THE LAND AND FRESHWATER 

 MOLLUSCA OF SCOTLAND. 



WM. DENISON ROEBUCK, F.L.S. 



t 



SINCE the publication of my " Census of Scottish Land and 

 Freshwater Mollusca " in 1891 by the Royal Physical 

 Society of Edinburgh, and of a further paper by myself 

 in the Scottish Naturalist for July 1891, I have received 

 specimens from various friends, to whom, and particularly 

 to my indefatigable helper Mr. William Evans, F.R.S.E., of 

 Edinburgh, the Rev. George Gordon, LL.D., and Mr. Robert 

 Service, I am much indebted for the material here incorporated. 



