116 



PKOCEtJDINGS OF THE MALACOLOGICAL SOCIETY. 



Lunatia catena (da Costa). 

 L. sordida (Phil.). 

 Triforis perversa (L.). 

 Cerithiopsis tubercularis (Mont. 

 Scala clathratula (Ad.). 

 Lotoriuvi nodlferum (Lam.). 

 L. cutaceum (L.). 

 Cassidaria rugosa (L.). 

 C. echinopliora (L.). 

 Cardium papillosum, Poli. 

 Solecurtus scoptila (Turt.). 

 S. antiquatus (Pult.). 

 Barnea parva (Penn.). 

 Thracia pubescens (Pult.). 

 Dentalium vulgare, da Costa. 

 Emarginula conica, Schum. 

 Fissurella graca (L.). 

 Haliotis tubcrculata, L. 

 Gibbula magus (L.). 

 G. umbilicata (Mont.). 



Monodonta crassa (Montf.). 

 Calliostoma montagui (W. Wood). 

 C. exasperatum (Penn.). 

 C. striatum (L.). 

 C. granulatum (Born). 

 Donovania viinima (Mont.). 

 Ocinebra erinaceus (L.). 

 O. corallina (Scac). 

 Hcedropleura ecostata (da Costa). 

 Mangilia. attemiata (Mont.). 

 M. rugulosa (Phil.). 

 M. brachystoma (Phil.). 

 BeUardiella gracilis (Mont.). 

 Clatliurella reticulata (Ken.). 

 C. purpurea (Mont.). 

 Hamincea liydatis (L.). 

 Philine catena (Mont.). 

 Ap>lysia depilans, L. 

 Pleurobranchus plumula (Mont.). 

 Oscanius 7nembranaceus (Mont.). 



The following species occur in the Channel Islands, but have not 

 yet been met with in waters on the north side of the English 

 Channel : — 



? Teredo pcdicellata, Quat. 

 Setia pulcherrima (Jeff.). 

 Haliotis tuberculata, L. 



Lotorium nodiferum (L.). 

 L. ctitaceum (L.). 

 Ocinebra corallina (Scac). 



Of the above, Z. 7iodifefum has not again been found in British 

 waters since three living specimens were trawled off Guernsey 

 between 1825 and 1832. Z. cutaceus is probably still an inhabitant, 

 though rarely, of tliis station. I have myself picked up two worn 

 shells at Herm, and Mr. Marshall dredged a living specimen off 

 Guernsey, in 22 fathoms, in 1885.' Purpura hcemastoma, L., has 

 probably not lived on these shores in recent years. Thei'e is a record * 

 of the discovery of three specimens at Guernsey, but they were 

 probably due to the refuse of French trawlers. Brest is the most 

 northern authentic recorded habitat of the species. 



P. Fischer remarks^ that the English Channel "est une veritable 

 barriere qui limite I'expansion vers le uord de 81 especes de la cote 

 fran^aise et de la Mediterranee ". I do not feel quite clear whether 

 Fischer meant that all the eighty-one species inhabit the southern 

 coast of tlie English Channel. If they do not — and a consideration 

 of the list makes it seem very unlikely that they do — the effectiveness 

 of the ' veritable barriere ' tends to disappear. Certainly, of forty-nine 

 species whicli he cites specificallj-, six at least have been found on the 

 northern side of the Channel since he wrote. A juster view of the 

 case would appear to be, that not more of the Lusitanian fauna ' drop 

 off' on the northern, as compared Avith the southern, side of the 

 English Channel than one would naturally expect. 



' Journ. Conch., vol. xiii, p. 202, 1911. 

 2 J. T. Marshall, ibid., p. 197. 

 ^ Man. de Conch., 1887, p. 14r). 



