to be considerably heavier than that of livini^ materiel. 

 Dredge ond core SE.mplos showed thrt this e>xposed gr^vel ves 

 limited to r mrro\r zone just beyond the exposed rock from 

 4.00 to 500 meters deep. 



At groGter depths, this grovel becomes ovrrl;.yed end 

 mixed vith f fine colccr.!ous mud and finclly disappefrs al- 

 together from our samples between 500 find 6 00 meters. From 

 500 meters to 2200 meters the calcfreous r.iud becomes in- 

 cref singly fine. 



The bottof.- frunc vt s extraordinrrily scarce. Never 

 in yecrs of dredging experience hrve I se(-:n so few orgcnlsms 

 of rny kind brought up after long drags over the bottom. 

 Also when one considers that the very cle?. r waters of the 

 Tongue cannot produce anything but a very slow depo-^it of 

 sediment in the deeper water, any tracks or markings of 

 organic activity must persist for a long time. The paucity 

 of such trails and tracks on all photogrf phs except fig. 19 

 taken in 561 meters therefore confirms this impression of 

 an almost barr.-n bottom. 



PLi^K.:vTON 



While in the field it appeared thrt the amount of 



plankton collected ft vfrious depths wf s subject to systems-- 



tic variations. Careful analysis of this by measuring the 



displacement voluiae and reducing to cc per hour towed does 



/ 

 not substanticte this impression. (table 7) . Reports en the 



resu].ts of systematic studies on the vfrious groups of 



organisms obtained will appear at a later date. 



