180 ANIMALS OF THE SEASHORE 



Littorina irrorata Say (Salt Marsh Periwinkle) 



PLATE XX. Fig. 4 



Resembles L. litorea in general appearance but 

 with a higher spire; usually white with a series 

 of brown revolving lines or dots. Very common in 

 New Jersey attached to Eel Grass or other salt 

 marsh plants. It is usually found between tides 

 or above high tide and lives in brackish or even 

 almost fresh water. Known from Massachusetts 

 to Texas, but is rare north of New Jersey and pos- 

 sibly in some cases a recent addition either by 

 migration or introduction with oysters. 



Littorina obtusata Linne 



(L. paliata Say) 



Fig. 28 B 



Small (% inch in length), low spired, usually 

 olive in color, occasionally banded. Pound on sea 

 weed and associated with L. litorea along the coast 

 of New England. Rare in New Jersey but occasion- 

 ally found in brackish water or associated with L. 

 litorea on various rock jetties along the coast. Cape 

 May appears to be its southern limit. 



Littorina saxatila Olivi 



(L. rudis Maton; L. groenlandica, Menke) 



Fig. 28 A 



About the same size as the above; the spire is 

 higher and there are usually revolving bands; usu- 



