16 



Nassa incrassata Gasteropoda opistho- Bulla Crancbii 



Mangelia linearis branchiata. Pliiline aperta 



nebula Cylichna cylindracea Aplysia punctata or 



teres „ truncata hybrida 

 Ampbispira hyalina 

 Being — 



Acepbala lameUibrancbiata 35 in 1:^4, or 20 per cent. 



Acepbala palliobrancbiata — „ 5, „ — „ 



Pteropoda — >> 3i >> — " 



Gasteropoda prosobrancbiata 19 „ 136, ,. 14 ,, 



Gasteropoda opistbobrancbiata li „ 21, „ 29 ,, 



Total number of marine testaceous mollusca common to the west of 



Scandinavia and to the Canary Islands, 50 in 280, or 17 per cent, of 

 the former. 



British Seas. 



The number of species of British marine testaceous mollusca, re- 

 corded by Messrs. Forbes and Hanley, is 406. 



Acepbala lameUibrancbiata 163 



Acepbala iialliobrancbiata 5 



Pteropoda 4 



Gasteropoda prosobrancbiata 209 



Gasteropoda opistbobrancbiata 25 



The following British species are common to North America : — 



Lacuna vineta 

 Lacuna puteolus 

 Skenia divisa (serpu- 

 loides) 



„ planorbis 

 Skenia? (margarita?) 



costulata 

 Scalaria Groenlandica 

 Natica pusiUa 



„ bclicoides 

 Velutina lasvigata 

 Lamellaria perspicua 

 Tricbotropis borealis 

 Pui-pura lapillus 

 Buccinum undatum 



Dalei 

 Fusus Islandicus 



„ antiquus 



„ propinquus 

 Tropbon clatbratus 



„ muricatus 

 Mangelia tumcula 



„ rufa 



Tre\iLliana 



ACEPHALA lAMELLI- 



branchiata. 

 Teredo Non-agicus 

 Pbolas crispata 

 Saxicava arctica 



„ rugosa 

 Mya truncata 



,, arenaria 

 Panopoea Norvegica 

 Solen ensis 

 TeUina proxinia 

 C3'prina Islandica 

 Astarte sulcata 

 Lueina borealis 



„ flexuosa 

 Turtouia minuta 

 Kellia rubra 

 MytUus edulis 

 Modiola modiolus 

 Crenella discors 



„ nigra 



„ decussata 

 Nucula tenuis 

 Leda caudata 



Leda pygmoea 

 Anomia aculeata 



Acephala pallio- 

 beanchiata. 

 HypotbjTis psittacea 

 Terebratula caput ser- 

 pentis 



Gasteropoda pro so - 

 branchiata. 

 Cbiton albus 



,, assellus 



„ cinereus 



„ raarmoreus 



,, ruber 

 Acmoea testudinalis 

 Propilidiuni ancyloide? 

 Puncturella noacbina 

 Trocbus beUcinus 



,, undulatus 

 Jantbina communis 

 Littorina rudis 



,, teuebrosa 



