46 LITTORINID.E. 



and Plymoutli (J. G. J.). The variety occurred to me 

 in the laminarian zone at Skve, and theWhalsey Skerries 

 in the east of Shetland. Fossil in the post-glacial beds 

 of Norway fi'om the present level of the sea to 100 feet 

 above it (Sars). This author has also noticed it lining 

 on the Norwegian coasts as far north as Oxfjord in 

 Finmark ; I found it at Etretat in Normandy, ^lartin 

 in the Gulf of Lyons, Mace at Antibes, and Philippi at 

 Sorrento and Palermo. Although local, it is not un- 

 common. 



It is an active and restless little creature. I observed 

 in this and other species oiRissoa an upward and down- 

 ward current or movement on the surface of each ten- 

 tacle, apparently caused by the action of the cilia. 



Having carefully compared British and Mediterranean 

 specimens, I still believe that Philippics description and 

 figm'e of R. soluta fairly represent oui* shell. It varies 

 considerably in the length and compactness of the spire, 

 as well as in the degi'ce of sculpture. Indeed the 

 striae cannot be detected in most specimens unless by 

 means of d, high magnifying- power, Avhich possibly 

 Philippi was not in the habit of using. He especially 

 mentioned the umbilical fissure that characterizes the 

 present shell. S carles Wood proposed to call our species* 

 intersecta, in case its identification with Philippics species 

 should prove to be erroneous; Bean gave it the MS. 

 name of minutisshna, and Martin that of globosa. The 

 last two names I have seen in collections. 



21. Pt. semistria'ta ^, Montagu. 



Turbo semistriatus. Mont. Test. Br. Suppl. p. 136. B. semistriata, F & 

 H. iii. p. 117, pi. Ixxx. f. 4, 7. 



Body pale-yellowish-white : palUal filament short : snout 

 * Half-striated. 



