NO. 2 OLGA HARTMAX : SUBMARINE CANYONS 47 



polychaetes, Glycera, Pista, 



Pectinaria 47.8 



1 10 Acila castrensis 1 1.0 



In 235 meters, with 57.85 grams : 



3 mollusks, Compsomyax, Y oldia, Dentalium 16.3% 



154 Pectinaria 17.35 



71 Pista disjuncta 49.00 

 5 Nothria pallida 



and other polychaetes 17.35 



In 272 meters, with 33.9 grams, polychaetes comprised nearly 100% 

 of the biomass. 



In 396 meters, with 25.5 grams: 



polychaetes 97.5% 



mollusks 2.5 



In 420 meters, with 43.6 grams : 



echinoderms 32.5% 



echiuroids 30.00 



polychaetes 29.0 



mollusks 6.0 



others 2.5 



In 478 meters, with 30.8 grams: 



echinoderms 74.6% 



polychaetes 7.5 



mollusks 6.6 



others 11.3 



In 553 meters, with 13.7 grams: 



mollusks 36.5% 



echiuroids 34.3 



polychaetes 29.2 



In 642 meters, with 24.0 grams : 



echinoderms 70.8% 



mollusks 20.4 



polychaetes 8.8 



In summar}'. therefore, the hea%iest animals in Newport canyon 



change with depth. In shallowest places there are enteropneusts, nemer- 



teans, mollusks and polychaetes. At about 178 meters large brissopsids 

 and Xephiys are conspicuous, and at 282 and 396 meters the heaviest 



are polychaetes. Brissopsids and Arhynchite are again present in 420 



