308 Proceedings of the Royal Physical Society. 



I have a young shell (two-thirds grown) 

 which I took alive from the under side of 

 a stone in a rock pool, at very low water, 

 opposite the Marine Hotel, North Berwick. 

 It is thin and semi-transparent, with a sharp 

 outer lip, the young of this species being 

 unlike the mature form. I have gathered 

 the shell at the same stage of growth on 

 Herm beach, near Guernsey, where M, 

 laevis is not rare {M). 

 Cyprcea eurojpcea (Mont.). 



Largo Bay, etc. {M'B.); Firth of Forth 

 {Ed. Mus). 



Eare on the Edinburgh beach. It becomes 

 more frequent as we go east, and at North 

 Berwick is sometimes very abundant. At 

 North Berwick adult specimens worn 

 smooth, and having about two whorls of 

 the spire laid bare, are not uncommon {M.). 

 We have taken it at North Berwick, Largo 

 Bay, Anstruther, etc. 



IV. Pleurobranchiata — 



BULLID.E. 



Cylichna umhilicata (Mont.). 



Firth of Forth {M'B). 

 C. cylindracea (Penn.). 



Bass Eock, 24 fathoms {Metz. and Mey.) ; 



Firth of Forth {MB.) ; on the beach at 



Dirleton and North Berwick, but not 



plentiful (if.). 



We have found this species in Largo Bay. 

 Utriculus truncatulus (Brug.). 



Firth of Forth (3PB.); common on the 



beach at North Berwick and Dunbar {M.). 



We have found it on the beach west from 



Aberdour. 



