The Scottish Naturalist: 
129 
oblivion, without any attempt being made to give them legislative 
effect. It therefore seems to me premature to consider whether we 
adopt any other than the present definitions of counties. 
I am glad to note Dr. White's reference to the willingness of 
Perthshire collectors to assist in making the " Census " more per- 
fect, and also to the valuable source of information afforded by the 
Perthshire Natural History Museum ; and I need hardly say that I 
shall be delighted if Perthshire collectors would act in accordance 
with Dr. White's statement, and forward specimens to the Concho- 
logical Society at Leeds for authentication, carefully stating the exact 
locality and the particular division of Perthshire from which each 
set of specimens comes. I have placed the "near Perth" records 
under the vice-county in which the sender informed me he had 
collected the specimens; but there are some cases in which I was 
unable to obtain the desired particulars, and these have been sub- 
ject to the rule that the record must be placed on the same side of 
the boundary line as the town itself, and it is these latter records 
that require confirmation. 
I hope that I may be able to induce Scottish naturalists gener- 
ally to do their utmost to assist us to complete the task of record- 
ing and authenticating the comital distribution, by sending 
examples to the Conchological Society of anything which will 
serve to fill up a blank in the tables of distribution appended to 
my paper, a copy of which table I will gladly send to any one 
who is desirous of helping in the work. 
I have now to say that I wish to enlist the assistance of Scottish 
naturalists in another direction. I have never lost sight of the 
printed records, have diligently collected them wherever I met 
with them, and have in preparation a Bibliography of published 
records of Scottish Land and Fresh- Water Mollusca, to be printed 
at some future time. If, therefore, my friends will kindly draw 
my attention to any records that have appeared in print, and will 
assist me to make the Bibliography complete, they will confer upon 
me a great obligation. The Bibliography, when published, will 
then form the necessary supplement to the " Census," and will 
clear me wholly from any suspicion of ignoring published 
records. 
The Introduction of Limnsea Stagnalis into 
Lanarkshire. — It is always to me a matter of gratification 
to be able to correct errors, and I am much indebted to Mr. 
I 
