CHAP. VI.] 



DEEP-SEA DREDGING. 



275 



Ccelenterata . 



Echinodermata . 



Species. 



Iiydrozoa 2 



Anthozoa 20 



Criuoidea 



Asteridea, including Opliiuridea 



Echinoidea 



Holothuridea 



2 

 21 



5 



— 36 



Mullusca 



Arthropoda . 



Gephyrea G 



Annelida 51 



Polyzoa 35 



Tunicata 4 



Braehiopoda 4 



Concliifera 37 



Cephalophora 53 



Aracknida 1 



Crustacea 105 



57 



133 



- 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 300 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." 1 



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



1 Fortsatte Bema. j rkninger over det dyriske Livs Udbredning i 

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

 1868.) 



T 2 



