Modiola tulipa 

 Crenella mannorata 

 Area tetragona 



„ lactea 

 Pectunculus glycimeris 

 Auricula Tarentina 

 Lima bians 

 Pecten opercularis 

 ,, pusio 



Gasteropoda peoso- 



BEAJtCHIATA. 



Chiton fascicularis 

 Dentaluim dentalis 

 Calyptrffia Sinensis 

 Fissurella reticulata 



„ gibba 



Haliotis tuberculata 

 Troebus exiguns 



,, striatus 



94 



Trocbus magus 



„ ziz3i)binus 

 Solarium luteum 

 Turbo rugosus 

 Pliasianella pullus 

 Jantbina communis 

 Littoiina neritoicles 

 Plissoa costata 



,. pai-va 



.. pui-purea 



,, crenulata 

 Tunitella tricostalis 

 Cceoum trachea 

 Ceritbium reticulatum 



„ adversum 



Sealaria clathratula 

 Eulima polita ? 

 Cheinnitzia elcgantis- 

 siniii 

 rufa 



Chemuitzia indistincta ? 

 Odostomia conoidea 

 Mm-ex coraUinus 



„ Edwardsii 

 Pnii^ura ba;mastoma 

 Nassa reticulata 



,, inerassata 

 Mangelia purpurea 

 striolata 

 linearis 



,, nebula 



Pleurotoma elegans 



Gasteropoda opistho- 



brakchtata. 

 CyUclma cjlindracea 



,, mamiUata 



,. truncata 

 Bulla hydatis 

 Pbiline aperta 



Being in proportion to the whole number of north of Spain species — 



Aeepbnla lamellibranchiata 30 in 88, or 41 per cent. 



Aeephala pdliobrauebiata — 1, ,. — ,, 



Gasteropoda prosobrancbiata -iO ,, 113, ,. 35 



Gasteropoda opistbobrauchiata 5 ,, 10. ,. 50 ,. 



Total, 80 in 212, or 38 per cent. 



Mediterranean Si^a and Southern Coasts of Spain and Portugal. 



One marine fauna is distributed generally throughout the Mediter- 

 ranean, but many forms found in the East do not extend to its western 

 extremity ; and others, generally inhabitants of the Atlantic, seem to 

 have penetrated but a short distance to the eastward of the Straits of 

 Gibraltar. As examples of the former, may be mentioned the genera 

 Clavigella, Thecidia, Umbrella, Pedicularia, Dolium, Casidaria, &c., 

 with numerous species, such as Venerupis deciissatus, Trochus Sprattii, 

 &c. ; and of the latter the genera Ervilia, Siphonaria, Acmcea, Mesalia, 

 aud Cijmha, with the species Lutraria eliptica, Venus striatula, Astarte 

 sulcata, Astarte triangularis, Natica intricata, aud various others. 



Some forms and species appear to have the whole of their range 

 within the limits of the Mediterranean, as Pedicularia, Thecidia, Casi- 

 daria echinopJiora, &c. ; while there exist a few, such as Psammobia 

 costata, Ervilia castan.ea, Lithodomus caudigenis, found on the coasts of 

 the Atlantic, both north and south of the Straits of Gibraltar, but not, 



