29 



Acephala lamellibranchiata 88 "j 



Acephala iialliobranchiata 1 



Gasteropoda prosobrancbiata 1:] r'^l-i Species. 



Gasteropoda opisthobranchiata 10 I 



The following species appear to be commou to the North of Spain 

 aud to North America : — 



Acephala lamelli- 

 branchiata. 

 Teredo navalis ? 

 Saxicava arctica 

 „ rugosa 

 Soleu ensis 

 Astarte sulcata 



Lucina tlexuosa 

 Mytilus edulis 



Littorina rudis 

 Lacuna i)uteolus 

 Velutiua kevigata 

 Lamellaria perspicua 

 Purpura lapillus 

 Ti'ophon muricatus 



Gasteropoda proso- 

 beanchiata. 

 Chiton cinereus 

 Janthina communis? 



Shewing the proportion of North Spanish species recorded from North 

 America to be — 



Acephala lameUibraucliiata 7 in 88, or 8 per cent. 



Acephala paUiobrauchiata — ,, 1, „ — 



Gasteropoda iirosobranchirtta 8 ,,113, „ 7 



Gasteropoda opisthobranchinta ... — ,, 10. ,, — 

 Total 15 in 212, or 7 per cent, 



