186 



MEDITERRANEAN PROVINCE. 



be expected, this region gave a large proportion of 



new species, such as Pecten Hoshinsii, Lima crassa, 

 Nucula JSgeensis, Scalaria hellenica, Parthenia fas- 

 ciata and ventricosa. 



Ligulaprofundisdma, Pecten similis, Area imbri- 

 cata, Dentalium quadr angular e, and Pissoa reticulata, 

 are more prolific in individuals in this region than 

 in any other. 



Ophiura abgssicola, Amphiura florifera (Chiaje), 

 and Pectinura vestita are the Echinoderms of this 

 eighth region, and are well fitted, by their organi- 

 zation, for living in the mud of these depths. Cargo- 

 pliyllia cyathus, Alecto, and Idmonea range down to 

 these depths. 



Ligida profundissima and Dentalium quinquean- 

 gulare are the most generally diffused species below 

 105 fathoms. Nucula, Necera, Area, and Kellia live 

 as deep as 180 fathoms. Area imbricata was taken 

 alive as low as 230 fathoms. 



The Terebratidce would seem to have their limit 

 in the seventh region. 



Of these eight regions of depth of the same sea, 

 the iEgean, the highest and the lowest have only 

 two species of Mollusks in common — Area lactea 

 and Cerithium lima, and there is a doubt whether 

 the last may not be a straggler from the zone above. 

 Eegions three to eight inclusive have only two 

 species in common. 



These results are of such significance to the 

 Palaeontologist, that for his use the following table 



