98 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
Aigean Sea (Forbes). In America, Mr. Whiteaves informs 
me he has dredged this species in the neighbourhood of 
Gaspé. 
* Cylichna cylindracea, Pennant. 
Bulla cylindracea, Pennant; Bulla oliva, Gmelin ; Bulla 
cylindrica, Pulteney; Volvaria cylindrica, Brown. 
Habitat—Common in mud, muddy sand, and nullipore in 
8 to 380 fathoms; everywhere in Bute and Cumbrae, and 
generally throughout the district. 
British distribution.—Nearly everywhere in muddy sand; 
a common species. Mr. Jeffreys gives Loch Fyne as a locality 
for the variety linearis, which I have never seen. 
Foreign localities—Norway and Sweden (Lovén, and 
others), and throughout the Atlantic coasts as far as Mogador 
and the Canaries (M‘Andrew), Mediterranean and Adriatic 
to the Meean Sea (Horbes). 
Utricuus, Brown. 
* Utriculus mammillatus, Philippi. 
Bulla mammillata, Philippi; Bulla striatula, Yorbes ; Bulla 
minuta, Macgilliwray; Cylichna mammillata, Yorbes and 
Hanley. 
Habitat——On the Tan Spit, Cumbrae; Ascog shore and 
Bogany Point, Bute; and off Silvercraigs, Loch Fyne; scarce 
in a living state—dead shells not uncommon. It inhabits 
a bottom of muddy sand and nullipore, in about 8 to 12 
fathoms. Mr. Norman records it from Lamlash Bay. 
British distribution.—South-western and western coasts, 
all Ireland, north of Scotland, and the east coast as far south 
as Yorkshire. 
Foreign localities—Norway and Sweden (Lovén, and 
others); French, Spanish, and Portuguese coasts; all the 
Mediterranean as far as the Aigean (forbes). M‘Andrew 
records it from the Canaries. 
* Utriculus truncatulus, Brugwieére. 
Bulla truncatula, Bruguiére; Bulla truncata, Adams; Vol- 
varia truncata, Brown; Cylichna truncata, Forbes and 
Hanley. 
Habitat—Among small seaweeds in rock pools and at the 
roots of Laminariz at low tide, as well as in sand below 
stones between tide marks; rather common throughout the 
