BYNE : MARINE INlOLI.tJSCA OF TEIGNMOUTH. l8l 



type on the rocks and from Chorda filmn weed from 

 mackerel boats. 



L. puteolus Turt. Found in great numbers on various 

 weeds on the rocks here at low spring tides. Both light 

 coloured and banded forms are present. Recent obser- 

 vation of certain rocks leads to the conclusion that in 

 early spring the adults come in to deposit their ova on 

 the nearest ones, and then retire to others in deeper water. 



L. puteolus var. clausa Jeff. Light-coloured and banded 

 examples sparingly with the type, but they do not attain a 

 large size. 



L. puteolus var. expansa Jeff. Fine light-coloured and 

 banded examples, under similar conditions, living alone 

 and with the type on various weeds. 



L. pal I id u la DaC. The finest adults have been found living 

 together on very isolated rocks, only accessible at the 

 lowest spring tides or by boats, chiefly in the forks of 

 Chondrus crispus. 



L. pallidula var. albescens Jeff. The light yellow form, 

 occurring with the type. Fine adults and young speci- 

 mens from amongst the tangle-weed on ledges of rocks, 

 but they are not frequently met with. 



Littorina obtusata L. Common. 



L. rudis L. A well-marked banded form from cockle-beds 

 in the river. 



L. rudis var. saxatilis Johnst. One specimen only. 



L. neritoides L. Common. 



L. littorea L. The 'winkles' are largely gathered for food. 



Rissoa cancellata DaC. One fresh example trawled in the 

 bay. 



R. punctura Mont. Trawled alive; dead specimens in 

 drift, but scarce. 



R. costata Ad. Dredged, and dead examples in drift. 



R. parva DaC. On various weeds on rocks, and from 

 trawling, with other species. 



