BULLA. 441 



deaux, fide Leach); Torbay and Plymouth (coll. Turton); 

 Falmouth (Cranch, fide Leach, Cocks, and Hockin) ; 

 Dogger bank (Parke); Scarborough (Bean); Northum- 

 berland (Alder); Berwick Bay (Johnston and Mennell); 

 Arran Isles, co. Galway (Barlee); Cork Harbour (Hum- 

 phreys); co. Antrim (Hyndman) ; western coasts of 

 Scotland (Barlee and others) ; Moray Firth (Gordon) ; 

 Aberdeen (Macgillivray) ; Shetland (M f Andrew and 

 others) . I dredged a single specimen of the variety in 

 Loch Fyne. B. utriculus occurs in the Antwerp Crag 

 and Bordeaux tertiaries (Nyst); upper miocene bed near 

 Antibes (Mace); Italian tertiaries (Brocchi and others) ; 

 Vienna basin (Homes) . Its present distribution extends 

 from Finmark (Sars) to the Canary Isles (M f Andrew), 

 both sides of the Mediterranean (Cantraine, Weinkauff, 

 and others) , Adriatic (Brocchi and Brusina) , and iEgean 

 (Forbes); depths 20-140 f. 



Its habits are sluggish. The head supports the front 

 of the shell, while the foot forms the base of the living 

 cushion. In the north it seems to be a favourite food 

 of the haddock. 



This species was at first considered by Brocchi the B. 

 striata of Bruguiere. Leach called it B. Cranchii, 

 Johnston B.punctura, and Nyst B. utricula. B. modesta 

 of Kisso is probably the young. It may also be the 

 B. puncto-striata of Mighels and Adams, from the 

 eastern coasts of North America. 



B. striata was described by Turton as British, under the 

 name of B. alba. I cannot, on such authority, recog- 

 nize it as indigenous. His specimens (two in number) 

 have evidently been acted upon by muriatic acid, so as 

 nearly to remove the outer and coloured layer. Dr. 

 Gordon kindly sent me for inspection two specimens 

 collected in North Uist and at Durness. How they got 



u 5 



