268 



Messrs. M'Andrew and Barrett on the Mollusca 



Laminarian Zone. 



The ground in this region is generally rock; between low 

 water and 15 fathoms the bottom is covered with Laminaria, 

 and below 15 fathoms with a small red weed, which is the 

 favourite habitat of Margarita cinerea. On the fronds of the 

 Laminaria abound several species, as Lacuna vincta, Trichotropis 

 borealis, Margarita helicina and undulata, and Patella pellucida. 

 In the south, Urastei' rubens, Echinus sphcera and Echinus miliaris 

 are common among Laminaria ; in the north, Echinus neglectus 

 is found in great numbers just below low-water mark. 



Testacea of the Laminarian Zone. 



Gastebopoda. 



Cancellaria viridula. 

 Trichotropis borealis. 

 Fusus autiqims. 

 Trophou clathratus. 



Gunneri. 



Biicciuum undatum. 

 Nassa reticulata. 



incrassata. 



Bela turricula. 



rosea. 



rufa. 



mitrula. 



Trevelliaua. 



Defrancia linearis. 

 Natica nitida. 



^lontagui. 



helicoides. 



piisilla. 



clausa. 



Velutina laevigata. 



flexilis. 



Odostomia plicata. 

 Cerithium reticulatum. 

 A])orrhais pes-pelecani. 

 Turritella communis. 

 Scalaria grcculandica. 



Loveni. 



Littorina littorea. 

 Lacuna vincta. 



Lacuna labiosa. 

 Rissoa calatbus. 



striata. 



pana. 



rufilabrum. 



Skenea, species. 

 Trochus millegrauus. 



tumidus. 



cinerarius. 



Margarita belicina. 



undulata. 



cinerea. 



Puncturella noachina. 

 Emarginula reticulata. 

 Pileopsis bungaricus. 

 Patella pellucida. 

 Acmaea virginea. 



testuclinalis. 



Pilidium fulvum. 

 Deutalium entale. 

 Cbiton ruber. 



asellus. 



marmoreus. 



cancellatus. 



Cylichna truncata. 

 Pbiline scabra. 



aperta. 



Aplysia hvbrida. 



Lam ELLI BRANCH lATA. 



Anomia c])bippium. 



patelliformis. 



aculeata. 



Pecten opercularis. 

 islandicus. 



Pecten pusio. 



striatus. 



similis. 



Lima bians. 

 Loscombii. 



