Shewing the jn-oportjon to British species of— 



Aeephala lamellibraiichiata 24 in 163. or 14 per cent. 



Aeephala palliobrancbiata -^ .. 5, ,, 40 „ 



Pteropoda — 4. — 



Gasteropoda prosobranclii.ita 3.5 ,, 309, „ 17 „ 



Gasteropoda opistbobranchiata — 25, ,, — 



Total of British marine testaceous iiioUusca, common to North 

 America, 61 in 406, or 1.5 per cent. 



Referring to the list of species common to Britain and Scandinavia, 

 we find them to bear the following proportion to the British 

 species : — 



Aeepbala lamellibrancbiata 97 iu 163, or 01 percent. 



Acepbala palliobrancliiata 4 ,, 5, ,, 80 ,, 



Pteropoda — 4, — 



Gasteropoda prosobranchiata 101 ,, 309, ,, 49 



Gasteropoda opistbobrancbiata 15 ,, 35, ,, 60 ,, 



Total of British marine testaceous mollusca, common to Scandinavia, 

 217 in 406, or 53 per cent. 



The following British species have been obtained on the coasts of 

 the north of Spain, including Vigo, except those marked,* which, 

 though not hitherto procured from the district, may he considered as 

 belonging to it, in consequence of having been foiind in more southern 

 localities : — 



ACEPHALA LAIIELLI- 

 BRANCHIATA. 



Teredo navaUs* 



„ palmulata* 

 Pholas Candida* 



,, dactylus* 



„ parva* 

 GastrocbcEna modiolina ? 

 Saxicava arctica 



„ rugosa 

 Petricola lithopbaga 

 Venerupis irus 

 Corbula nucleus 

 Sphfjcnia Binghami* 

 Neoera euspidata 



„ costeUata* 



„ abljre^aata* 

 Poromj'a granulata* 

 Pandora rostrata 

 obtusa 



Lyonsia Norvegica 

 Thracia pbaseolina 



,, pubescens * 



,, convexa * 

 Solen marginatus 



,, en sis 



,, siliqua 



,, peUucidus * 

 Ceratisolen legumen * 

 Solecurtus coarctatus * 



„ candidus * 



Psammobia vespertina 



,, tellinella 



,, Ferroensis * 



,. costulata 



Dioilonta fragilis 

 TelUna crassa 



., balaustina * 



,, incaniata* 



,, donacina 



Tellina tenuis 

 fabula* 



,, solidnlii, * 

 Syndosmya alba 



,, prismatica 



,, tenuis 



Scrobicularia piperata 

 Donax anatinus 



,, politus » 

 Ei-vilia castanea * 

 Mactra subtruncata 



,, soUda 



,, stultoum * 



,, lielvacea * 

 Lutraria elliptica 



,, oblonga 

 Tapes dceussata 



„ virginea 



,, pullastra 



,, aurea 



