JOURNAL OF CONCHOLOGY. 161 
with shells some idea may be formed as to its abundance. 
The shells are unusually fine, and the var. adda occurs with 
the type. 
Valvata piscinalis:(Mull.).—So far I have taken this shell 
only near Bassenthwaite. The specimens are very much 
depressed in form. j 
V. cristata Mill.—I have only one or two specimens from 
Derwentwater, but have no doubt it will turn up elsewhere 
in the district, as it is common at Caldbeck. 
Unio margaritifer (L.).—The Greta at Keswick, the Der- 
went, and Chapel Beck, Bassenthwaite, have all provided 
me with specimens of this species. 
Pisidium fontinale (Drap.)—Not common. Keswick and 
Bassenthwaite. 
P. pusillum (Gmel.).—Very common, and in one or two 
localities at Bassenthwaite the shells are very large, clean, 
and shining. 
In conclusion, I should like to say that the present paper 
is not put forward as giving an exhaustive list of the land 
and freshwater mollusca of lakeland, as no doubt more careful 
attention than I have given to the subject will bring more 
species to light. 
-———————@+@+ .- ———_ 
Protective resemblance of shell of Helix cantiana Mont. to 
its surroundings.—Whilst at Airmyn, on August 14th, photographing 
the mouth of the River Aire, I had occasion to leave the narrow path which 
runs upon the top of the high embankment to take another view through the 
tall reeds and overhanging willows I then noticed on a large leaf of colts- 
foot (Zussilago farfara L.) a specimen of Helix cantiana, and on stooping 
down saw that there were several more on the same leaf. Further search 
showed that many of the neighbouring leaves were tenanted by these 
molluscs, and that there was a singular and protective resemblance between 
the pale-green fading leaves of the plant, with their autumnal patches of 
invading fungoid growths, and the brown blotched grey shell of HZ, caztiana. 
With this knowledge, on my return to the embankment of the river, I was 
able to gather specimens in places I had previously passed by without noticing 
them.—HENRY CROWTHER, F.R.M.S., The Museum, Leeds. (Read 
before the Conchological Society, Sep. 4th, 1595). 
24/12/95. L 
