NO. 2 OLGA HARTMAN: SUBMARINE CANYONS 45 



In 459 meters, total weight 46.3 grams: 



35 Chloeia and Pista 97.8% 



mollusks 2.2 



In 461 meters, total weight 39 grams: 



3 brissopsids 77.2% 



4 Arhynchite sp. 10.3 

 polychaetes 9.7 

 mollusks 2.8 



In 468 meters, total weight 57.0 grams: 



3 brissopsids 66.5% 



11 echiuroids 24.0 



polychaetes 9.5 



In 522 meters, total weight 51.5 grams: 



2 brissopsids 46.4% 



Dolychaetes 44.7 



nemerteans 8.9 



In 661 meters, total weight 3.9 grams: 



polychaetes 41.03% 



a ghost shrimp 25.64 



nemerteans 25.4 



a ceriantharian 5.13 



mollusks 2.56 



In 666 meters, about 5 grams, of which polychaetes comprised nearly 

 100%. 



In 7 1 6 meters, with 5.0 grams : 



polychaetes 75% 



mollusks 25 



Below this depths weights were negligible. 



Newport canyon: — This canyon was sampled in depths of 16 to 



741 meters; values were high only in 211 meters and irregularly 



decreased with depth. Biomass values in grams per square meter are 

 as follows : 



506.4 gm/ sq.m., in 21 1 m. 102.2 gm/ sq.m., in 97 m. 



191.6 gm/ sq.m., in 16 m. 96.0 gm/ sq.m., in 642 m. 



160 gm/ sq.m., in 37 m. 87.2 gm/ sq.m., in 420 m. 



146 gm/ sq.m., in 85 m. 86.2 gm/ sq.m., in 178 m. 



135.6 gm/ sq.m., in 272 m. 44.8 gm/ sq.m., in 553 m. 



