64 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
Arran, a few dead shells were obtained. Mr. Norman has 
taken it, also dead, in same locality. 
British distribution.—Rather common in the south of 
England, and especially so in the Channel Islands, from low 
water down to the Coralline zone. It has been taken round 
all the Irish coasts, and in Scotland as far as Orkney and 
Shetland. On the east coast the only localities I have 
noticed are Northumberland (Alder), and Dunbar (Laskey). 
Foreign localities—From Norway and Sweden, through- 
out Western Europe, and as far as the Canaries (M‘Andrew). 
It inhabits both sides of the Mediterranean and the Adriatic. 
* Rissoa parva, Da Costa. 
Turbo parvus, Da Costa; Cingula alba, ? Fleming ; Rissoa 
fuscata, ? Brown ; Rissoa pulchella, Forbes ; Persephona 
Scotica, Leach ; Rissoa tristriata, Macgillivray. 
The variety interrupta = Turbo interruptus, Adams. 
Habitat—Swarming in rock pools on the south and 
south-west shores of Cumbrae, and more or less common in 
like localities throughout the district. The variety inter- 
rupta. is also common, and lives in‘company with the type. 
British distribution.—Every where; exceedingly common. 
Foreign localities—From Norway to the Canaries, and 
throughout the Mediterranean. 
* Rissoa inconspicua, Alder. 
Turbo albulus, Maton and Rackett ; Rissoa maculata and R. 
similis, Brown. 
Habitat——In the Coralline zone throughout our Firth, but 
scarce and generally dead. Mr. Norman found it alive on 
decaying Laminarize and in rock pools in Lamlash Bay. 
British distvibution.—On all our coasts from the Lami- 
narian zone downward. 
Foreign localities.—From Norway (Sars), throughout 
Western Europe to the Mediterranean, and as far east as 
the AMgean Sea (Spratt). It is recorded (doubtfully) by 
M‘Andrew from the Canaries. 
* Rissoa membranacea, Adams. 
Turbo membranaceus, Adams; Turbo labiosus, Montagu ; 
Cingula labiosa, Fleming; Rissoa oblonga, and R. ven- 
tricosa, Desmarets ; Rissoa labiosa, Forbes and Hanley. 
The variety elata=Rissoa elata, Philippi. 
Habitat.—In the Laminarian zone at Farland Point, 
Cumbrae; not uncommon. Mr. Robertson has taken the 
