6 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
never taken in the dredge, most specimens being obtained 
from the line fishers and the herring netsmen. It fre- 
quents rough stony ground, and this habitat is usually 
considered the reason why the species is so very seldom 
taken in the dredge. I think; however, that it owes its 
escape rather to its activity than to the nature of the bottom. 
The headquarters of this fine species appear to be in Loch 
Fyne. Mr. Robertson and Mr. Norman have obtained it 
from off the Little Cumbrae, and the latter has also taken 
it off the east side of Holy Island, Arran. 
British distvibution—West and north of Scotland, and 
as far south as Sunderland (Aldev), but doubtfully. 
Foreign localities—Norway (Lovén, and others), Medi- 
terranean and Aigean Seas (Spratt, Forbes, and others). 
* Pecten tigrinus, O. F. Miller. 
Pecten parvus, Da Costa ; Pecten obsoletus, Pennant. 
Habitat—Very common on gravel mixed with sand and 
mud, in 10 to 40 fathoms; apparently distributed over the 
whole district. Very fine examples were obtained by me off 
Craigmore, Ascog, and Garroch Head, in Bute; and on a 
rough bank west of the Battery, Cumbrae. The shell is 
generally free, but sometimes attached by a byssus. The 
variety costata is also common. 
British distvibution.—Throughout our seas, but more 
plentiful in the north, and especially so on the western 
coasts of Scotland. 
Foreign localities—From Norway (Sars, and others), 
throughout the Dutch and French coasts, and as far as 
northern Spain (M/‘Andrew),. 
Pecten striatus, O. F. Miiller. 
Ostrea fuci, Gmelin ; Pecten Landsburgi, Forbes. 
Habitat—In 15 to 20 fathoms, amongst stones and dead 
shells, attached by a byssus. It is not uncommon, but, so 
far as I know, never plentiful. My finest specimens were 
taken off Craigmore, Bute. 
British distribution—Northern and western coasts of 
Scotland; Isle of Man; and all Ireland. Alder records it 
from 50 fathoms, off the Northumberland coast. 
Foreign localities. — Faroe Islands (Mérch), Finmark 
(Lovén), Norway (Savs), northern and southern coasts of 
Spain and Portugal (M* Andrew), Mediterranean and Adriatic 
(Jeffreys, in Supp. Brit. Con.). 
