Mollusks. 7241 



Orula acuminata {Bulla acuminata). Has been dredged in Lamlash 

 Bay by Mr. Alder {Forbes and Hanley) and Dr. Landsborough. 

 Marginalia laevis {Marginella voluta). Ayr, Smith. 



Div. II. Opistholbranchiata. 



Fam. XX. Bullida. 



*Cylichna cylindracea {Bulla cylindrical B. cylindracea, Volvaria 

 cylindrica). Occasionally dredged near Cumbrae, and in Lamlash 

 Bay. Bute, Smith. 



C. truncala {Bulla truncata, Volvaria truncata). Abundant in rock- 

 pools, apparently in all parts of the Clyde ; and very common dead 

 in shell-sand. 



*C. obtusa {Bulla obtiisa). Lamlash, Landsborough. 



C. mamillata {Bulla mamillata)^. Frequent among shell-sand from 

 Landsborough's Bay. 



C. umbilicata {Bulla umbilicata). Rare, Lamlash Bay. 



" To this genus belongs the Volvaria alba of Brown (111. Conch. 

 G. B. p. 3, pi. 19, fig. 43, 44), said to have been found at Greenock, 

 and usually supposed to be (as British) a fossil species." — Forbes 

 and Hanley. 



Amphisphyra hyalina {Bulla hyalina, B. pellucida, Bullcea minuta). 

 Widely distributed throughout the district in rock-pools at spring 

 tides. 



Tornatella fasciata {Tornatella tornatilis). I have taken a specimen 

 or two to the west of Cumbrae, and also in Lamlash Bay. Ayr, Bute, 

 Smith. 



Akera bullata [Bulla akera). Scarce in Lamlash Bay. Ayr, Bute, 

 Smith. 



Bulla Cranchii. I dredged a single very fine specimen of this 

 shell in deep water outside of Lamlash Ba}s 



Scaphander lignarius {Bulla lignaria). Abundant in Karnes Bay, 

 and, in deeper water, about twenty-five fathoms oflf the Allans, 

 Cumbrae; also at Lamlash. Ayr, Smith. At Whiting Bay, in 

 Arran, it may be taken by " digging in the sand at ebb-tide," Lands- 

 borough. 



Philene aperta {Bullcsa aperta). Not common, and always small, 

 Cumbrae and Arran. Ayr, Smith. 



P. punctata {Bullcea punctata). Lamlash, Landsborough. 



P. Catena {Bullcea catenata, B. caienulifera). Lamlash, Lands- 

 borough. I dredged a living example of either this or the last 

 XVIII. 3 M 



