82 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
British distribution—Everywhere on suitable ground 
very common. 
Foreign localities—Norway (Lovén, Jeffreys, and others), 
northern and southern Spain and Portugal (M‘Andrew), 
Mediterranean (Philippi, and others). 
* Natica Montacuti, Forbes. 
Natica Montagui, Forbes; Nerita rufa, Montagu; Natica 
rufa, Fleming ; Natica rutila, Macgillivray. 
Habitat—F¥rom 12 fathoms downward on muddy gravel ; 
exceedingly common throughout the whole district, and 
occasionally large and fine. My largest specimen, measuring 
0’.65 long by 0’.55 broad, is from Cumbrae. This species 
never inhabits the littoral or sub-littoral zone like the pre- 
ceding. 
British distribution.—Common in our northern seas, and 
extending south as far as the English Channel, where it 
becomes less plentiful. It is abundant and fine on the 
Dogger Bank (Leckenby and Marshall). 
Foreign localities—Iceland (Steenstrup), Norway and 
Sweden (Lovén, and others). 
FAMILY SOLARIIDH, Chenu. 
ADEORBIS, Searles Wood. 
Adeorbis subcarinatus, Montagu. 
Helix subcarinata, Montagu; Trochus rugosus, Brown ; 
Cingula subcarinata, Pleming. 
Habitat——I have obtained a few dead specimens in the 
Coralline zone off Silvereraigs, Loch Fyne. Mr. Robertson 
has taken it off Callum’s Hole, Bute; and Mr. Norman in 
Lamlash Bay—doubtless in a dead state. 
British distribution—Chiefly southern. It has been 
taken throughout the English Channel, and in the Channel 
Islands; on the Welsh coast, and all round Ireland. It is 
also reported from Aberdeen by Dawson. Live specimens 
are exceedingly scarce in British waters. 
Foreign localities. —From the French Atlantic coast 
throughout Spain, Portugal, and the whole Mediterranean, 
Adriatic, and Augean Seas. M‘Andrew also records it from 
Mogador. 
