7206 Mollusks. 



Fam. V. Fissurellidai. 



*Fissurella reticulata {Fisnurella Grceca). Bute, Smith. Between 

 Holy Island and Clachland Point, Greville and Miles. 



Puncturella noachina {Cemoria Flemingii, Fissurella noachina). 

 Abundant in company with Pilidium fulvuin, to the note on which 

 species I beg to refer. It has likewise occurred to me off the west of 

 Cumbrae. Bute, Smith. Mr. Smith was the first to record this 

 species as living on our coasts. 



E margin ula reticulata {Emarginula fissura). Common on shells 

 and stones in the coralline zone. 



E. crassa. Has been taken by Mr. Barlee in Loch Long, Forbes 

 afid Hanley. 



Fam. VI. TrochidcB. 



Trochus zizyphinus. Not very common. 



T. alabastrum. " Lamlash Bay, dredged by Mr. Eyton," Greville 

 and Miles. Surely there must be some error ? 



T. millegranus {Trochus Martini). Frequent among nuUipore in 

 the Laminarian and Coralline zones. Specimens in good condition 

 are comparatively scarce, as its sculptured surface renders it peculiarly 

 liable to be incrusted with Balani, Serpulae, &c. 



T. exiguus {Trochus interruptus). Ayr, Smith. Perhaps from 

 ballast, or T. Montagui may have been mistaken for it, as that species 

 is not mentioned in Mr. Smith's list. 



T. Montagui {Trochus Montacuti). One specimen taken off Cum- 

 brae is all that has occurred to me. Dr. Landsborough records it as 

 found at Lamlash. 



T. tumidus. Common. 

 *T. cinerarius {Trochus perforatus). Abundant. > 



T. umbilicatus. Common. 



T. magus. Not common. The Clyde specimens, though frequently ? 

 very large, are always very dull in colouring, indeed generally destitute i 

 of all painting. 



*T. crassus. Cumbrae, Smith. There must surely have been some 

 mistake in the admission of this species j probably the specimen found 

 was from ballast. 



T. undulatus. Recorded as found at Lamlash by Dr. Lands- 

 borough. 



T. helicinus {Margarita communis, Margarita vulgaris). Frequent 



