CHAP, VI.] DEEP-SEA DREDGING. O75 
Species. 
Hydrozoa . 2 
Ccelenterata. | athotoalt 9 
— 22 
Crmoid ear mage pes), <1. es, et) ae 
Eéhinodermata . | Asteridea, including Ophiuridea. 21 
Echinoidea Hy meg 5 
| Holothuridea . 8 
— 36 
( Gephyrea . 6 
MesINES Annelida 51 
— 57 
| Polyzoa. 35 
Tunicata : ae eh 
Mollusca, «.... ..-- Semachiopoda,  .- 2 we 4 
| Momenitera’, <a rn q eh as) OE 
Cephalophora . 55 
, — 133 
pAvachnida ssa ene SS Tire tte 
EL SIO, NW iGrustacca,’ Lelie et: Yep oof. ott. 
— 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.”’? 
In the year 1864, M. Barboza du Bocage, Director 
1 Fortsatte Bemzrkninger over det dyriske Livs Udbredning i 
Havets Dybder, af M. Sars. (Vidensk.-Selsk. Forhandlinger for 
1868.) 
| T 2 
