The Scottish Naturalist. 
James Bennie, of the Geological Survey of Scotland, for some 
valuable information as to the introduction of this fine and con- 
spicuous species into one of the three stations given for it in my 
*' Census." In that paper I give it for " Lanark. — Old Quarry at 
Possil by Glasgow (T. Scott ; A. Somerville.) " Immediately 
the paper appeared I received a letter from Mr. Bennie giving the 
history of this occurrence, and forwarding me copy of a letter 
from Mr. Wm. Newton MacCarthy of Glasgow. 
It would appear that nearly thirty years ago the late Mr. 
George Combe, heating engineer, of Glasgow, brought from 
England a large number of L. stagnalis for Mr. MacCarthy's 
aquarium, so large a number that when the aquarium was stocked 
Mr. MacCarthy, and a few other members of the Glasgow Natural 
History Society, took them to Possil Marsh and threw them into 
the quarry and into the deepest drains of the Marsh. Some years 
afterwards specimens were obtained by collectors, but it is so 
many years since Mr. MacCarthy visited the marsh that he does 
not know if any are to be obtained now. The introduction was 
made by Messrs. Coutts, Mahony, Newstead, MacCarthy and 
Combe, and the day must have been a holiday (New Year's Day, 
Mr. Bennie thinks), as Mr. Mahony had no other days for his 
outings. Mr. MacCarthy suggests that this shell has in a similar 
manner been introduced into its other Scottish stations, and Mr. 
Bennie adds that it was the belief of the introducers that the L. 
stagnalis was at that time exclusively English in its range, and 
that they were doing a patriotic act in introducing so handsome a 
species into Scotland. Mr. MacCarthy's supposition is probably 
correct, and I hope that the full history of the Hawick and Aber- 
lady occurrences, should they have been originally introduced, 
may be forthcoming. Nevertheless, it is to be noted that the 
published records of the species in Scotland date back to 1836 
(Gulane Loch) and 1833 (pond in Botanic Garden, Edinburgh, 
E. Forbes), so that the difficulty is increased by the lack of full 
evidence. There are also Berwickshire and Northumberland 
records given in 1838 in Dr. Johnston's Berwickshire list. 
It is very much to be wished that careful record should invari- 
ably be made of introductions of species into new districts, in 
which case we can entertain no particular objection to the practice. 
Banffshire MoUusca. — For the very few Banffshire records 
given in the " Census " I was indebted to Mr. Lionel W. Hinx- 
