m 



Cymba imlo, Pecten polymorphus, and Panopcea AldebramU, are met 

 with as far as the neighbourhood of Lisbon. The fine Chiton "rufiis, 

 the largest European representative of the genus, I have only obtained 

 in Lisbon and Vigo, and am not aware of its being recorded from any 

 other locality. 



The following species range from the southward to the coasts of 

 GaUicia and Asturias : — 



Tellina serrata 

 Mesodesma donacilla 

 Lutraria rugosa 

 Cardium papillosum 



,, ciliare 

 Liiciua digitalis 



,, peoten 

 KeUia ? (genus un- 

 certain ) 

 MytUus GaUoprovincialis 

 Lithodomus caudigurus 

 Chiton cajetanus 



Of the followMig species, the most northern known habitat is the south 

 of Gi'eat Britain and tlie coasts of Ireland : — 



Dentalium dentalis 

 FissureUa gibba 

 Troehus Laugieri 



Solarium luteum 



,, straminimii 



Littorina tigrina 

 Kissoa ijurpurea 

 Turbo rusosus 



Tumtella tricostulis 

 Fusus contrarius 

 Murex. Edwardsii 

 Purpura hoemastoma 

 Nassa trifasciata 

 Cassis saburou ? 

 Triton nodiferum 



,, corrugatum 

 Pleurotoma elegans 

 Ringuicula auriculata 

 Aplysia Patersoni 



Pliolas pana 



Gastrochcena modioliiia 



Petricola litlioiihaga 



Venerupis ii-us 



Pandora rostrata (Chan- 

 nel Islands 



Diodonta fragilis ( Car- 

 narvonshire ) 



Syndosniya tenuis 



Donax politus 



Ei-vilia castanea 



Mactra lielvacea 



Lutraria oblonga 



Tapes decussata (Car- 

 narvonshii-e) 



Cytheria chione, ( Car- 

 narvonshire ) 

 Venus veri'ucosa 

 Cardium aculeatum 



,, rustii^uiii 

 Lucina divaricata 

 Diplodonta rotuiidata 

 (ialeomma Turtoni 

 M<idiola barbata 

 CreaeUa costulata 

 rhouibi'ii 

 Avieula Tarentina 

 Calyptrcea Sinensis 



(Milford) 

 Emarginula rosea 



Haliotis tuberculata 

 Troehus exiguus 



,, striatus 

 Adeorbis subearinatus 

 Rissoa lactea 



„ striatula 

 Sealaria elathratula 

 Chemnitzia scalaris 



,, fenestrata 



Truncatella Montagui 

 Mui-ex corallinus 

 Laehesis minima 

 Nassa pygmoja 

 MangeUa gracUis ( Clyde ) 

 Ovnla patida 



It is a fact to be noted, as probably bearing some relation to an ancient 

 distribution of land, that the range of many species of mollusca, in 

 proceeding northward, takes a curve to the west. Several inhabitants 

 of the Mediterranean, such as Tellina halauslina, Circe minima, Psam- 

 mohia costidata, Nccera all the species, MangeUa Lefroyii, Maryiiwlla 

 Imvis, Ac, touching upon the extremity of Cornwall, and extending 

 round the west of Ireland to the Hebrides, althougli absent from the 

 Channels and the north sea; also a few species being found enmmoji to 



