ADAMSIA. el 
the others are instantly brought to its aid, and the hermit 
may soon find that he is more than compensated for the 
crumbs that fell from his own booty*.” Mr. W. Thomp- 
son states that every shell he saw invested by A. maculata 
was tenanted by Pagurus Prideauau. This, Dr, Johnston 
adds, proves the general union, but that Professor E. Forbes 
assures him that, on the coast of the Isle of Man, the shells 
to which the Adamsia attaches itself are seddom inhabited 
by the hermit-crab. He states also that the Adamsia seems 
to change its habitation according to its size. 
The first time I observed the Adamsia was in the island 
of Arran, before I had turned my attention much to zoo- 
phytes. I was in search of shells, wading in the pretty 
Highland brook called Glenrosa-burn, where it falls into 
the sea near Brodick. As the tide was in, the water must 
have been somewhat brackish. I saw numbers of Zrochus 
magus, and to my great surprise the mollusk, as I thought, 
had wrapped itself round the outside of the shell. The 
animal was beautifully spotted, and as I did not then know 
the appearance of the true inhabitant of Zrochus magus, I 
* “Excursions to Arran, with reference to the Natural History of the 
Island,’ by D. L. Johnstone and Hunter, Paternoster-row, London, and 
Princes-street, Edinburgh. 
