LACUNA. 
On 
eo) 
FAMILY LITTORINIDA, Gray. 
Lacuna, Turton. 
* Lacuna divaricata, O. Fabricius. 
Trochus divaricatus, Fabricius ; Turbo vinctus, Montagu ; 
Lacuna vincta, Turton ; Lacuna pertusa, Conrad ; Lacuna 
cornea, L. striata and L. bifasciata, Brown. 
Habitat—On rocky coasts adhering to Laminariz and 
Fuci at low tide, and down to afew fathoms. It is dispersed 
over the whole district, but I have found it more abundant 
at Farland Point, Cumbrae, than elsewhere. 
British distribution.—Common throughout all our seas. 
Foreign localities—All the northern seas of Europe from 
Iceland (Verkriizen) and Norway (Lovén) to the Bay of 
Biscay. In America it occurs from Greenland to Massa- 
chusetts (Gould). 
* Lacuna puteolus, Z’wrton. 
Turbo puteolus, Turton; Cochlea parva, Da Costa ; Helix 
lacuna, Montagu ; Lacuna Montacuti, Turton. 
Habitat—At Farland Point, Cumbrae, amongst sea weeds 
at low tide, very scarce. Mr. Norman records it as plentiful 
on the Allans Rocks in Millport Bay. 
British Distribution.—Local on many parts of our coasts. 
from the Channel Islands to Shetland, but more common in 
the southern waters than in the north. 
Foreign Localities—From Norway (Lovén) throughout 
all the western shores of Europe, as far as Vigo Bay 
(M‘ Andrew). 
* Lacuna pallidula, Da Costa, 
Nerita pallidulus, Da Costa. 
Habitat—On Fuci and other sea weeds at low water and 
a little above it, local and generally rather scarce. I have 
taken it in greatest number at Farland Point, Cumbrae, and 
it is also somewhat plentiful at Silvercraigs, Loch Fyne. 
Specimens are generally of a pale straw yellow, but a green 
variety is nearly equally common, both living together. 
They do not keep their colours, however, in the cabinet. 
British distribution.—Throughout all our seas, but chiefly 
on the southern and western coasts, somewhat local but not 
uncommon, Alder and others have found it on the North- 
umberland, Durham, and Yorkshire coasts; Laskey at 
Dunbar; M‘Intosh at St. Andrews; Macgillivray on the 
Aberdeenshire coast, and Forbes in Orkney. 
