52 



substance, which passes through the whole. We are not 

 sure that this is the true P. mirabilis of Linnaeus, as the 

 figures quoted will not allow us to be so. It is apparently 

 very rare as British; for I do not know of any but the one in 

 our possession dredged up by Mr. Simmons off Inch-Keith, 

 and presented to me by James Brodie, Esq. F. L. S. 



