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The spines are more truly aculeate, or like the prickle on a 
rose-stalk, somewhat flattened longitudinally with the shell, 
seldom contrary, as in the other shells. The larger spines have 
a canal or narrow furrow ; in the other species they are 
often dilated, especially at the narrow side. The spines 
on the narrow side are all curved towards the hinge, and on 
the broadest side they are curved from the hinge. 
We are confirmed in our opinion of its being a species, 
by seeing fine specimens in Lady Wilson’s cabinet, and a 
large one which Dr. Grey was so good as to show us at the 
British Museum. The latter is at present without a name, 
and is as large as C. aculeatum is commonly found *• other- 
wise the spines near the hinge of C. aculeatum might lead 
us to think them the same species. 
' AboVe ^ice the size of the Figure, with all the spines flat. 
