Lebour : Marine Mollusca of Sandsend, Yorkshire. 1 7 3 



Lacuna crassior (Mont.). Small form, common under stones 

 among the rocks at spring-tides. These were a beautiful 

 rose-pink when fresh, which very soon faded. 



Lacuna puteolus (Turton). A few specimens on seaweed. 



Littorina littorea (L. ). Very common on the rocks; black, 

 red, and striped varieties. 



Littorina obtusata (L.). Very common on the rocks, chiefly 

 dark varieties. 



Littorina rudis (Matori). Very common on the rocks and in 

 crevices of the cliffs in great variety. 



Littorina neritoides (L. ). A few young specimens in crevices 

 of rocks near high-water mark. 



Rissoa parva (Mont.). Very common under stones among the 

 rocks. 



Var. interrupta. Still more common than the type under stones 

 and on seaweed. 



Rissoa punctura (Mont.). Fairly common in shell sand. 



Rissoa costata (Adams). Two specimens in shell sand. 



Rissoa striata (J. Adams). Extremely common under stones 

 among the rocks between tide-marks. 



Var. arctica. Very common in shell sand. 



Rissoa semistriata (Mont.). Common under stones between 

 tide-marks. 



Hydrobia ulvas (Penn). One specimen in shell sand. 



Fam. SKENEIM:. 

 Skenea planorbis (Fab.). Not common in shell sand. 



Fam. PYRAMIDELLID.E:. 

 Odostomia unidentata (F.&H.). A few specimens in shell sand. 

 Odostomia acicula (Philippi). One specimen in shell sand. 

 Odostomia interstincta (Mont.). A few specimens in shell 

 sand. 



Odostomia aibella (Loven). One specimen in shell sand. 



Fam. NATICID^. 

 Natica catena (DaCosta). Small specimens common in shell 

 sand. 



1902 May 1. 



