4 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
water.” It seems to be rare in this district, although Mr. 
Jeffreys speaks of it as a common shell. 
British distribution.—Throughout the southern, western, 
and northern coasts of Britain; generally distributed. On 
the eastern coast it is recorded from St. Andrews (‘ntosh) 
and Northumberland (Alde7). 
Foreign localities—¥rom Norway (Lovén, and others), 
throughout western Europe and the Mediterranean as far as 
the Adriatic (Brusina). 
Pleurotoma brachystoma, Philippi. 
Pleurotoma brachystomum, Philippi; Mangilia tiarula, 
Lovén ; Mangelia brachystoma, Yorbes and Hanley. 
Habitat—A single dead and worn specimen in Rothesay 
Bay. 
British distribution.—Scarce and local, but dispersed over 
nearly all our coasts from Cornwall to Shetland. 
Foreign localities —From Norway and Sweden (Loven, 
and others), throughout western Europe, the Mediterranean, 
Adriatic, and /igean Seas (/orbes). In the Atlantic it 
ranges as far south as Mogador, where M‘Andrew records it 
as frequent in 36 fathoms. 
* Pleurotoma nebula, Montagu. 
Murex nebula, Montagu; Mangelia nebula, Forbes and 
Hanley. 
Habitat—Scarce in muddy gravel and stones in 10 to 25 
fathoms off Moll Dhu and Silvereraigs, Loch Fyne; and 
outside the Tan Spit, Cumbrae ; living in these localities, but 
only one or two specimens from each. 
British distribution.—On all our coasts; apparently not 
uncommon in the south from low water down to a few 
fathoms. In Scotch waters it seems to be much scarcer, and 
to inhabit a rather deeper zone. 
Foreign localities—North of France (De Gerville), Spain, 
Portugal, and Madeira (M‘Andrew), Mediterranean, Adriatic, 
and Aigean Seas (Philippi, Spratt, and others). 
Pleurotoma septangularis, Montagu. 
Murex septangularis, Montagu ; Murex costatus, Pulteney ; 
Murex septem-angulatus, Donovan; Pleurotoma secalinum, 
Philippi; Mangelia septangularis, Forbes and Hanley. 
Habitat——I have never taken this species, but have seen 
a single live example in Mr. Robertson’s cabinet, dredged off 
Cumbrae. Mr. Norman records it as rare in Lamlash Bay. 
