CHAP, vi.] DEEP-SEA DREDGING. 275 



Species. 



/Hydrozoa 2 



Coelenterata . . . . i . ,, 



I Anthozoa 20 



22 

 /Crinoidea 2 



1 Asteridea, including Ophiuridea . 21 



.bcnmodermata . . < -r-, , . . , ... 



] -Cjchmoidea o 



^ Holothuridea 8 



3G 



, r / Gephyrea 6 



Vermes < A ,. , -, 



( Annelida 51 



57 

 f Polyzoa 35 



Tunicata ........ 4 



Mollusca . \ Brachiopoda 4 



Conchifera 37 



I Cephalophora 53 



133 



( Arachnida 1 



Arthropoda . < ~, -, ^ r 



( Crustacea 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 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." l 



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



1 Fortsatte Bemserkninger over det dyriske Livs Udbredning i 

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



18G8.) 



T 2 



