58 MISCELLANEA. 
Pecten Danicus.—The Rev. Jos. Law of Hylton, first obtained 
this shell on our coast from the Sunderland fishing boats. More 
recently I have taken two specimens from the boats that frequent 
deeper water. One living example, found off the Ferns, is the var. 
septemradiatus Mull. ‘The other normal form was fished up in 
deep water, 30 miles H. of the Tyne. Both specimens are full 
grown, and compared with the measurements given in Forbes 
and Hanley’s British Mollusca, are much larger than any from the 
west of Scotland. Its occurrence has also recently been recorded 
in the Berwickshire Transactions, by Mr. Embleton, of Embleton. 
Since writing the above, I have seen a fine specimen in the New- 
castle Museum, which was also obtained from deep water fishing 
boats. —JLbid. 
Acmea testudinalis.—“ The student of history,” says a late ex- 
cellent naturalist, ‘‘follows with intense interest the march of a con- 
queror, or the migrations of a nation. ‘The traveller traces with 
almost breathless delight every step of the progress of some mighty 
hero of ancient days. Yet, absurd as it may seem to those who 
have not thought of such things before, there is a deeper interest 
in the march of a periwinkle, and the progress of a limpet.” 
Imust confess to having felt during last year, a much deeper interest 
in the migration of the Tortoise-shell limpet southward along our 
coast, than in the victorious march of the red-shirted Italian 
patriot toward Naples and Rome, but it must be confessed that 
the movements of the former are shrouded in much deeper 
mystery than the successful march of the latter. Why a limpet, 
which had formerly its stronghold in the Arctic Seas, and is now 
plentiful in the boreal provinces of the North Atlantic, should be 
extending its limits to the south, is what we cannot at present 
understand or explain. We can say with certainty, from careful 
searching, that ten years ago, this shell did not occur in three 
or four places on our coast, where it is now tolerably plentiful. 
Its first discovery at Whitburn has already been noticed in our 
‘Transactions, and Mr. A. Hancock has lately mentioned its occur- 
rence at Roker. Last Haster, 1860, I revisited an old and favourite 
searching ground which I had not examined for 10 years, and was 
much surprised to find it inhabited by the Tortoise-shell Limpet. 
