PLATE XY. 
has also been met with in Greenland, Iceland, and Norway ; and is 
likewise noted as a native of the Southern Ocean *. 
The shell found on the British coast is very small, brittle, and femi- 
transparent. ‘The outside is of a brownish or rosy colour, tinged 
with green. The inside smooth, glossy, and somewhat pearly. 
* Gmelin.—Probably this variety found in the South Seas is that which Da Costa 
notices in his description of Mytilus discors:  All-that Linné has seen,’ (of Mytilus 
discors) ‘¢ as well as all those found on our coasts, are very small, thin, and delicate; 
but a kind no wise different, eXtept im size and colour, being larger than a great walnut, 
and quite brown, was brought from the southern hemisphere by that great and national 
honor, Capt. Cook, the circumnavigator, in the late expedition for the discoveries of 
new countries. These also were entirely uknown to all our collectors; and, as they 
only differ in size, thicknefs, and colour, but are exactly the same in structure, way of 
life, and other particulars as thefe of our coasts, is it a distinct species or wariety only ?”— 
Asa figure of this very analogous kind may be acceptable, it is introduced in the annexed 
Plate at fig. 2. 
