54 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 27 



In Tanner canyon large brissopsid echinoids are most conspicuous 

 at 298 and 496 meters. A large snail, Turcicula, occurs at 603 meters. 

 Most species are much smaller, greatly diversified, and deepwater, 

 having their more extended distribution in adjacent outer canyons. 



The irregularity of biomass data can be further demonstrated by 

 summarizing the totals for all canyons, from north to south and from 

 east to west, each with the numbers of samples, total numbers of cuft 

 taken, and total weights of larger animals in grams, as follows : 



