88 PHYTOPHAGA. 



2. Littorina muriatica. 



Turbo muriaticus Linn. 



Cyclostoma acutum Drap. 

 Which has been placed by the latter author as a 

 fresh-water species, is abundant on many parts of our 

 coasts. It is nearly allied to Littorina ulvce. Hart- 

 mann has formed a genus called Hydrobia from these 

 small Littorina?, 



