hey: marine shells of Yorkshire. 131 



Littorina rudis Maton. 



General between tide marks — Robin Hood's Bay, Redcar, &c. 

 A very handsome banded form occurs on rocks just below 

 Bay Town. Fine yellow specimens near Danes' Dyke. 

 Littorina saxatilis Johnston. 



This little species swarms where there are crannied rocks just 

 above high-water mark. Localities for it are the rocks which lie 

 at the foot of Scarborough Castle Hill, Cliffs south of the Spa, 

 Whitby East Cliff, The Peak, Filey Brig. 

 Littorina littorea L. 



Common on all scars, and profusely abundant in Robin Hood's 

 Bay. A bright scarlet form occurs here with the ordinary one. 

 Rissoa parva Da Costa. 



Very abundant at low-water mark at Scarborough, Filey, &c. 

 Rissoa striata Adams. 



Redcar — plentiful. 

 Rissoa cingillns Mont. 



Redcar — scarce. 

 Hydrobia ulvse Penn. 



Positively swarms on the slag breakwaters at the mouth of the 

 Tees, and among the muddy pools. Also at Spurn Point. 



SKENEID^. 



Skenea planorbis Fab. 



I liave taken a few specimens at Scarborough on the rocks 

 south of the Spa. 



TURRITELLIDyE. 



Turritella terebra L. 



Frequent at Redcar ; sometimes cast up in very large numbers. 

 Var. nivea Jeff. 



Occasionally found at Redcar. 



SCALARHDM. 



Scalaria Trevelyana Leach. 



I have several times met with this scarce shell on Redcar 

 beach. 



Scalaria graenlandica Chemn. 



A specimen has been shown me which was picked up at 

 Bridhngton on the sands. Can it have been derived from the 

 Bridlington Crag ? 



EULIMIDM. 



Eulima polita L. 



Scarborough — a fine series of local specimens in the Museum. 



Jan. 1885. 



