PLATE XXV. 



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. 



* Gmelln. — Probably this variety found in the South Seas is that which Da Costa 

 notices in his description of Mytilus discors. " All that Linne 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, except in 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 unknown to all our collectors ; and, as they 

 only differ in size, tbicknefs, 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 variety only ?"— ■ 

 As a figure of this very analogous kind may be acceptable, it is introduced in the annexed 

 Plate at fig. 2. 





