TROCHUS. 
or 
or 
Foreign localities—Northern Europe, including Norway 
(Lovén), Spitzbergen (Katon), White Sea (Middendorf ), 
Iceland (Verkriizen); Northern America, including Green- 
land (Fabricius), Labrador, and St. Lawrence (Dawson, 
and others), Massachusetts (Gould). It is also recorded 
from Behring’s Straits, Vancouver, and Sea of Okhotsk. 
* Trochus Groenlandicus, Chemnitz. 
Margarita undulata, Sowerby; Turbo carneus, Lowe ; 
Trochus inflatus, Brown ; Turbo incarnatus, Couthouy ; 
Trochus undulatus, Forbes and Hanley. 
Habitat—aA single live specimen of this northern species 
was taken by Mr. Robertson off Cumbrae. This is the most 
southern authentic locality for this shell in a living state— 
its known British distribution being confined to the Shet- 
land and Orkney Islands, and the northern and western 
coasts of Scotland as far south as Oban Bay (Norman). 
Foreign localities—From upper Norway (M‘Andrew, 
and others) throughout the Arctic Seas of Europe, including 
the White Sea, Iceland, and the Farée Islands; and 
in America it is recorded from Greenland and all the 
eastern coast as far south as Massachusetts (Gould, and 
others). 
* Trochus magus, Linne. 
Trochus tuberculatus, Da Costa. 
Habitat—On rough stony ground in 4 to 20 fathoms, 
local but not uncommon. ‘The best locality I know of is on 
the north side of Kamesburgh Bay, Bute, in about 4 to 6 
fathoms, on very rough ground, where fairly well coloured 
and eood- sized specimens were obtained. It may also be 
taken in 10 to 15 fathoms on a rough bank off Shellbole 
Bay, Cumbrae, and off the south end of Little Cumbrae, 
whilst Mr. Robertson has found it abundant and fine inside 
the Clach rock, Millport Bay. 
British distribution—Common on the southern and 
western coasts of England and Scotland, and throughout 
the Irish seaboard. In the north it is scarcer, and has not 
apparently been found on the east coast, excepting i in a dead 
state (Alder). 
Foreign localities—From southern Sweden throughout 
the Atlantic shores of Europe, all the Mediterranean, and as 
far south as the Canaries, and west to the Acores, 
