112 STENOGYRID. 
Mr. J. Emmet, in an interesting paper in the Vaturalist 
for 1885, points out that this shell is very abundant 
in the magnesian limestone district of Yorkshire; the 
writer says: “‘ Dr. Gray recommends searching at a depth 
of six or eight inches, but my experience is that you will 
find it at a much greater depth, even as much as eighteen 
inches below the surface. It depends upon how the marl 
is deposited, and upon the amount of soil overlying it. 
The great point is to look for it carefully amongst the 
marl below the soil, cautiously removing each fragment- 
ary piece of limestone that covers the rock, and intently 
looking in every cranny caused by the removal of the 
said marly and stony pieces, until the shell becomes 
conspicuous by its white appearance. Sometimes ten 
or a dozen will be taken in as many inches.” The 
writer goes on to predict that searched for in this way 
it will be found in various places which have all the 
necessary conditions, viz: at Knottingley, Doncaster, 
and Pontefract. Soon after the publication of this paper 
I heard from Mr. R. D. Darbishire that he had taken the 
shell at the first of the above mentioned places. 
Another method has suggested itself to collectors— 
placing boards rubbed with suet upon the surface of 
the ground where the shell is known or suspected to 
exist, in the hope that it may come to feed on the 
animal matter and adhere to the board. 
