CHAP. VI.] 



DEEP-SEA DREDGING. 



275 



Coelenterata , 



Echinodermata . 



Vermes . 



MoUusca 



Arthropoda . 



f Hydrozoa . . 



1 Anthozoa . . . 



iCrinoidea 

 Asteridea, including Ophiuridea 

 Echinoidea 

 Holothuridea 



j Gephyrea . 

 \ Annelida . . 



Polyzoa . . 

 Tunicata . . 

 BracHopoda 

 ConcMfera . . 

 Ceplialophora . 



( Arachnida 



I Crustacea . . 



Species. 



2 

 20 



— 22 

 2 



21 

 5 

 8 



— 36 

 6 



51 



— 57 

 35 



4 



4 

 37 

 53 



— 133 

 1 



105 

 106 



Of these 24 protozoa, 3 echinoderms, and 13 mol- 

 lusca are from a depth of 450 fathoms. Professor 

 Sars adds : " We may say, according to our present 

 information, that the true deep-water belt commences 

 at about 100 fathoms. The greater number of deep- 

 sea species begin to appear then, though sparingly, 

 and they increase in number of individuals as we 

 descend to 800 fathoms, or in some cases to 450, 

 when investigations have been carried so far. To 

 what depth this belt extends, or whether there is 

 another below it of a different character, is not yet 

 known." ^ 



In the year 1864, M. Barboza du Bocage, Director 



^ Fortsatte Bemserkninger over det dyrske Livs Udbredning i 

 Havets Dybder, af M. Sars. (Vidensk.-Selsk. Forhandlinger for 

 3.) 



t2 



