82 LITTORINID.E. 



state ; the vast accumulations being in all probability 

 derived from the numerous submerged rocks which stud 

 the waters that lie between this nook and the adjacent 

 island (S. H.). We have dredged it, dead, in fifteen 

 fathoms in west bay of Portland and on the south coast 

 of Cornwall (M'Andrew and E. F.) ; Falmouth; White- 

 sand bay, Cornwall; Manorbeer, Pembrokeshire (JeiFreys); 

 Torquay (8. H.), off Luiidy Island, and in fifty fathoms 

 on the Nymph bank, but dead (M'Andrew); "Guernsey, 

 Salcombe bay, Skye, Stornoway, Loch Fyne, Bantry, 

 Birterbuy Bay, and Arran Isles in Galway" (Barlec). 

 " Found in a few places on the east, west, and south 

 coasts of Ireland"" (W. Thompson). The preceding lo- 

 calities will show that it is mainly a southern and 

 western species. It does not range north of Britain, 

 though southwards extending throughout the Lusitanian 

 and Mediterranean regions. 



R. CALATHUs, Forbes and Hanley. 



Oblong-conic, finely cancellated throughout by longitudinal 

 and spiral costellar striae, of which latter there are four or five 

 rows on the penult volution. Whorls six, prominently rounded ; 

 the last but one rather elongated and swollen ; the last narrow. 

 Throat crenated. 



Plate LXXVIII.fig. 3. 



This shell is generally named " calafhiscus 'f in British 

 collections ; not that it agrees correctly with the figure in 

 Montagu\s " Testacea," but that it approaches his descrip- 

 tion more nearly than any well-authenticated indigenous 

 species. We have changed the name but slightly, so as 

 to facilitate the recognition and memory of the shell we 

 are about to describe. 



