160 MARINE PROVINCES. 



The identical species are chiefly amongst the shells dredged 

 from a considerable depth (35-50 fathoms) ; the littoral species 

 have a much more distinct aspect. 



The shells of the coast of Mogador are generally identical 

 with those of the Mediterranean and Southern Peninsula. 



Canary Islands. The shells of the Canaries collected by MM. 

 Webb and Berthelot, and described by M. d'Orbigny, amount to 

 124, to which Mr. M'Andrew has added above lYO. Of the 300 

 species 17 per cent, are common to Norway, 32 per cent, to 

 Britain, and 63 per cent, to the coasts of Spain and the Mediter- 

 ranean. Two onlj^ are W. Indian shells, Neritina viridis and 

 Golumhella crihraria. Of the African shells found here, and not 

 met with in more northern localities, the most remarkable are : — 



Crassatella divaricata. Ranella IjBvigata. Cymba proboscidalis. 



Cardium costatum. Cassis flammea. Conns betulinus. 



Lucina Adansoni. " testiculus. " Prometheus. 



Cerithiumnodulosum. Cymba Neptuni. " Gruinaicus. 



Murex saxatilis. " porcina. " papilionaceus. 



Madeira. Mr. M'Andrew obtained 156 species at Madeira, of 

 which 44 per cent, are British, 70 per cent, common to the Medi- 

 terranean, and 83 to the Canaries. Amongst the latter are the 

 two W. Indian shells before mentioned, and the following African 

 shells : — 



Pedipes. Mitra fusca. Patella crenata. 



Littorina striata. " zebrina. " guttata. 



Solarium. Marginella guancha. " Lowei. 



Scalaria cochlea. Cancellaria. " Candei. 



Natica porcellana. Monodonta Bertheloti. Pecten corallinoides. 



Azores. Amongst the littoral shells which range to the 

 Azores, are Pedipes, Littorina striata., Mitra fusca., and Ervilia 

 castanea ; the other species obtained there are Lusitanian. 

 (M'Andrew). 



The Mediterranean is the richest conchological fauna of tem- 

 perate seas. In its western part it is mostly identical with that 

 of the adjacent Atlantic coasts ; the number of species diminishes 

 eastward, although reinforced by a considerable number of new 

 forms as j'-et onl}^ known in the Mediterranean ; and three acces- 

 sions of a different character, from the Red Sea. The total 

 number of species is 1183, according to Monterosato and 

 Fischer. 



Cephalopoda, 53 Scaphopoda, 15 Lamellibranchiata, 302 

 Pteropoda, 19 Castropoda, 782 Brachiopoda, 12 



This enumeration includes the deep-sea dredgings of the 

 Porcupine Expedition. 



