86 



species of fastis obtained last summer, but uot yet named or 

 described, are doubtless arctic forms, though as yet only 

 known from the Zetland seas. Scalaria grocenlandica, the 

 ordinary habitat of which is sufficiently explained by its 

 specific name, will henceforward take its place among British 

 molusca, in consequence of my having, in the month of July 

 last, dredged a fragment of it off Duncansby Head, in about 

 35 fathoms, at the distance of 12 miles from land. Two 

 species, margarita carnea and crenella elliptica, are found at 

 Oban, but not further south. The only other British localities 

 that I am accpiainted with for the former, are Zetland and 

 Orkney ; the latter is met with in the northern Hebrides, but 

 has liitherto been esteemed extremely rare. I found it in 

 extraordinary abundance at Unst, the most northern of the 

 Zetland Islands. 



"Astarte compressa, A. elliptica, nucula tenuis, pecten nebu- 

 losus, patella ancyloides, cemoria fiemingii, natica montagui, 

 velutina ovata, chemnitzia rufescens, cyclostrema zetlandica, 

 rissoa abyssicola, fusus barviccncis, pleurotoma bootlui, tricho- 

 tropis borealis, and probably some others, inhabit the waters of 

 the Clyde, where their range appears to terminate. Amphi- 

 desma intermedia, crania norwegica, terebratula caput ser- 

 pentis, and lottia fulva, are present in the Clyde, from whence 

 their range crosses the north channel and extends by the west 

 of Ireland. Lottia testudiiiaria, a species of Iceland and the 

 arctic regions, unknown on the east coast of Scotland, and 

 even in Zetland, is abundant through the Hebrides, and 

 reaches to the north coast of the Isle of Man. Fusus bamffius, 

 a shell of Greenland, is frequent in the neighbourhood of Point 

 Lynas, but I do not believe to be found south of Anglesea. 

 Emarginula crassa, first known as a fossil of Sweden, though a 

 liviug inbabitant of Scandinavia, was discovered a few years 

 ago in the Hebrides and Clyde ; and I have very recently 

 received specimens of it, taken alive with oysters on the coast 

 of Carnarvonshire. 



