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 

 borealisj Margarita helicina and undulata, and Patella pellucida. 

 In the south, Uraster 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. 



Gasteropoda. 



Cancellaria viridula. 

 Trichotropis borealis. 

 Fusus antiquus. 

 Trophon clathratus. 



Gunneri. 



Buccinum undatum. 

 Nassa reticulata. 



incrassata. 



Bela turricula. 



rosea. 



rufa. 



mitrula. 



Trevelliana, 



Defrancia linearis. 

 J^atica nitida. 



Montagui. 



helicoides. 



pusilla. 



clausa. 



Velutina laevigata. 



flexilis. 



Odostoraia plicata. 

 Cerithium reticulatum. 

 Aporrhais pes-pelecani. 

 Turritella communis. 

 Scalaria grcenlandica. 



Loveni. 



Littorina littorea. 

 Lacuna vincta. 



Lacuna labiosa. 

 Rissoa calathus. 



striata. 



parva. 



rufilabrum. 



Skenea, species. 

 Trochus millegranus. 



tumidus. 



cinerarius. 



Margarita helicina. 



undulata. 



cinerea. 



Puncturella noachina. 

 Emarginula reticulata. 

 Pileopsis hungaricus. 

 Patella pellucida. 

 Acmaea virginea. 



testudinalis. 



Pilidium fulvum. 

 Dentalium entale. 

 Chiton ruber. 



asellus. 



marmoreus. 



cancellatus. 



Cylichna truncata. 

 Philine scabra. 



aperta. 



Aplysia hvbrida. 



Lamellibranchiata. 



Anemia epbippium. 



pateUiformis. 



aculeata. 



Pecten opercularis. 

 islaudicus. 



Pecten pusio. 



striatus. 



sirailis. 



Lima hians. 

 Loscombii. 



