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 Sahno 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 lbs. 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 

 17J lbs., 8 lbs., 5 lbs., 2 J lbs., and 2 lbs. 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. Giinther ("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 Salmonidse," 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. 



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. 



