i 74 Lebour : Marine Mollusea of Sandsend, Yorkshire. 



Fam. VELUTINIDiE. 

 Velutina laevigata (Penn.). Common in shell sand. 



Fam. BUCCINIDJE. 

 Buccinum undatum (L. ). Common among the rocks. 

 Purpura lapillus (L. ) Very common all over the rocks. 



Fam. XASSID.^. 



Nassa incrassata (Strom.). Very common under stones among 

 the rocks at low-water mark. 



Fam. PLE U ROTOM AT I T>JE> 

 Pleurotonia turricula (Mont.). Common in shell sand. 

 PJeurotoma rufa (Mont.). Common in shell sand. 

 Pleurotoma costata (Mont.). One specimen in shell sand. 

 Defrancia linearis (Mont.). Common in shell sand. 



Fam. CYPR^EIM:. 



Trivia europaea (Mont.). Very common. Thrown up every- 

 where on the beach. 



Fam. BULLID.E. 



Utriculus truncatulus (Brug.). Common in shell sand. 



Utriculus hyalinus (Turton). One specimen in shell sand. 



Utriculus obtusus (Mont.). One immature specimen in shell 

 sand. 



Philine catena (Mont.). Two incomplete specimens in shell 

 sand. 



PELECYPODA. 



Fam. ANOMIID^E. 



Anomia ephippium (L.). Young' specimens very common 

 under stones among the rocks, large detached valves often 

 thrown up on the beach. 



Var. aculeata. Common with the type. 



Fam. OSTREID.E. 



Ostrea edulis (L. ). A few detached valves thrown up on the 

 beach. 



Fam. PECTIXID.E. 



Pecten opercularis (L. ). A few detached valves of young 

 specimens in shell sand. 



Naturalist. 



