Qft 



AcEPHALA LAMELLi- Astarte sulcata 



BHANCHIATA. \ Luciiia horealis 



Snxicava arctica 1 



Solen ensis 



Gasteropoda vuosobhax- 



CHIATA. 



Lamellaria perspicna 

 Trophon muricatus 

 ^Marpriuella niiliacea 



The identity of the two last with European species I conceive to he 

 douhtful. Lucina flexuosa, mytihis edulis, and anomia aculeata, are 

 common to the Mediterranean Sea and North America, though not 

 included in the foregoing list. 



The proportion of the south west European species common to the 

 Scandinavian seas is — 



Acephala lanielUbrrtnchiata 55 in ICi'i or O-t per cent. 



Pteropoila — 3 — 



(lasteropoda pvosobranchiata ;U ,, 177 ,. 1!) ,, 



Gasteropoda opisthobranchiata 8 ,, 11 „ 7;{ ,, 



Total, 97 in 352, or 28 per cent. 



Of the same common to the British seas — 



Acepbala lamellibranchiata 100 in 162 or 01 per cent. 



Pteropoda — 3 — 



Gasteropoda prosobranchiata 00 ,, 177 ,, 39 ,. 



Gasteropoda opistliobrancliiata 9 ,, 11 „ 83 „ 



Total, 178 in 352, or 51 per cent. 

 There have been obtained of them as far north as Vigo — 



Aeephala lamellibrauehiata Ill in 103 or 09 per cent. 



Pteropoda — 3 — ,, 



Gasteropoda prosobranehiata 93 ,, 177 ,, 53 ,, 



Gasteropoda opisthobrauchiata 9 ,, 11 „ 83 ,, 



Together, 212 in 352, or 60 per cent, of the species of the south of 

 Portugal and Spain common to the north of Spain. 



It is worthy of notice, that while of 212 species collected in the north 

 of Spain only 29 do not extend to the south of Cape St. Vincent ; out 

 of 352 species obtained on the coasts of Portugal and Spain to the south 

 of that Cape, 140 species have not been met with so far north as 

 Vigo. 



Following is the proportion of south peninsular species which have 

 been procured in thp Canary Islands — 



