Lebour: Mari?ie Molhisca of Sandsend, Yorkshire. 175 



Pecten pusio (L.). Detached valves common on the beach. 

 Pecten varius (L.). A few detached valves in shell sand. 



Fam. MYTILID^E. 



Mytilus edulis (L.). Very common among the rocks, of small 

 size. 



Modiola modiolus (L.). Common among- the rocks. 



Modiolaria marmorata (Forbes). Detached valves common 

 in shell sand. 



Fam. ARCID^E. 



Nucula nucleus (L.). One valve in shell sand. 



Nucula nitida (Sow.). One small specimen in shell sand. 



Nucula tenuis (Mont.). One specimen in shell sand. 



Fam. KELOIDS. 



Montacuta bidentata (Mont.). A few detached valves in shell 

 sand. 



Kellia suborbicularis (Mont.). Common. Alive under stones 

 at spring-tides. 



Fam. CARDITID^E. 



Cyamium minutum (Fab.). A few detached valves in shell 

 sand. 



Fam. CARDIID^E. 

 Cardium edule (L.). Not common, thrown up on the beach. 

 Cardium fasciatum (Mont.). Common in shell sand. 



Fam. VENERID^E. 

 Venus gallina (L.). Common on the beach. 



Artemis lincta (Pult. ). Broken specimens thrown up on the 

 beach. 



Tapes pullastra (Mont.). Common, thrown up on the beach. 

 Tapes virgineus (L.). One young specimen in shell sand. 



Fam. TELLINID.E. 



Tellina fabula (Gronovius). Common, thrown up on the 

 beach. 



Tellina balthica (L.). A few specimens thrown up on the 

 beach. 



1902 May 1. 



