PLATE =X. 
Dr. Rutty mentions a Pinna ten inches long and five broad, caught 
near the Skerries, in Ireland; and Mr. Pennant ‘‘ saw specimens of 
vast Pinne, found among the farther Hebrides, in the collection of 
Dr. Walker, at Moffat;” but it is uncertain of what species either 
of these were: Mr. Pennant says, “ they were very rugged 6n the 
outside, buf cannot recollect whether they were of the kind found in 
the Mediterranean or West Indiés*.” 
° 
“The only British species of Pinna we are acquainted with, is the 
P. Muricata of Linnzus, or P. Fragilis of Pennant, and that is very 
rare. The latter author describes it from a specimen in the PORTLAND 
cabinet, which had been fished up at Weymouth, in Dorsetshire. Da 
Costa says, he has seen a very small one (of the same species) from the 
coast of Wales.—Both of these are represented in the annexed plate. 
This Shell is extremely thin and brittle, and gapes open at the 
broadest end. It is semi-pellucid, and of a horn colour; the outside 
marked with longitudinal ribs, roughened with rows of small prickles +. 
The inside is smooth, of a pale horn colour alfo, with a pearly jastee 
towards the top. 
* This Author, however, arranges it as a new British species, without further de- 
scription:—as, Pinna Ingens—Great Nacre. 
+ In Pennant’s figure these are obsolete. 
