70 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
Foreign localities. — From Norway to Spain and the 
Canary Islands, and in the Mediterranean and Adriatic Seas. 
FamiILy TURRITELLIDA, Clark. 
TURRITELLA, Lamarck. 
* Turritella terebra, Linné. 
Turbo terebra, Linné ; Strombiformis terebra, Da Costa ; 
Turritella communis, Forbes and Hanley. 
Habitat—Common throughout our district in mud and 
sandy mud from 3 to 4 fathoms downward. It is specially 
abundant in Rothesay Bay, where it is found inhabiting 
thick tenacious mud, in company with Bryssus lyrifer, 
Ophiocoma filiformis, Fusus gracilis, and the other few 
species characteristic of such unpromising deposit. 
The variety nivea is not uncommon in company with 
the type, but preferring a rather cleaner bottom than the 
mud above referred to. 
british distribution—Throughout nearly all our seas; 
gregariously abundant. 
Foreign localities—From Norway (Jeffreys and others) 
to the Mediterranean and Sea of Marmora (Spratt and 
others). M‘Andrew records it from Mogador. 
FamILy ScALARIIDA, Broderip. 
ScALARIA, Lamarck. 
Scalaria Turton, Turton, 
Turbo Turtonis, Turton ; Scalaria Turtoni, Fleming; Scal- 
aria tenuicostata, Michaud ; Scalaria planicosta, Bivona ; 
Scalaria Turtonis, Forbes and Hanley. 
Habitat—In the Coralline zone, off Bogany Point, and 
Ascog, in Bute ; and off the west coast of Cumbrae. All my 
specimens were dead, but Mr. Robertson has taken one or 
two live individuals off Cumbrae, and Mr. Norman reports a 
single example between Corriegills and Clachland Point, 
Arran. It is evidently a scarce species. 
Lritish distribution.—Sparingly found in many parts of 
our seas, but it does not seem to extend farther north than 
Aberdeenshire (Macgillivray). The following localities 
may be noted:—Whitburn (Abbes), Scarborough (Bean), 
Dogger Bank (Leckenby and Marshall), Guernsey (Lwkis), 
Devon and Cornwall, Wales, Dublin Bay, Bantry Bay, and 
at Arran, West of Ireland. 
