NO. 2 OLGA HARTMAN : SUBMARINE CANYONS 43 



In 330 meters, with 20.43 grams: 



1 Arhynchite sp. 58.88% 



polychaetes 41.14 



In 363 meters with 8.3 grams, polychaetes comprised nearly 100%. 



In 431 meters, with 2.14 grams: 



1 Arhynchite sp. 57.94% 

 polychaetes 39.72 

 brissopsids 2.35 



In 454 and 463 meters, with 27.7 and 2.6 grams respectively, 

 polychaetes comprised nearly 100% of the weights. 



In 475 meters, with 21.6 grams: 



3 brissopsids 72.2% 



Cardita and Amphissa 27.8 



In 583 meters, with 29.4 grams: 



polychaetes 44.9% 



2 brissopsids 39.5 

 1 ghost shrimp 15.6 



In 695 meters, with 8.85 grams: 



brissopsids 74.0% 



1 Solemya sp. 20.0 



others 6.0 



In 542, 612, 810 and 873 meters, weights were negligible or the 

 bottoms were without living animals. 



Redondo canyon: — Fifty- four samples were taken from shallowest 

 (57 m) to deepest (853 m) parts, and recognized as coming frqm 

 south wall, north wall, axis, basin slope and fan depths. Quantitative 

 measurements ran high both weight-wise and by numbers of speci- 

 mens. Biomass figures are available for some axis and fan depths: 



Axis depths: 



532.84 gr/ sq.m., in 560 m. 1 5 1 .2 gm/ sq.m., in 378 m. 



444.5 gr/ sq.m., in 137 m. 89.4 gr/ sq.m., in 503 m. 

 340.1 gr/ sq.m., in 246 m. 42.04 gm/ sq.m., in 61 1 m. 



247.6 gm/ sq.m., in 431 m. 

 Fan depths : 



15.6 gm/ sq.m., in 751 m. 11.32 gm/ sq.m., in 652 m. 



14.8 gm/ sq.m., in 808 m. 1 1.0 gm/ sq.m., in 853 m. 



14.4 gm/ sq.m., in 834 m. 10.7 gm/ sq.m., in 660 m. 

 13.6 gm/ sq.m., in 602 m. 9.0 gm/ sq.m., in 846 m. 



