NO. 2 OLGA HARTMAN : SUBMARINE CANYONS 39 



In 271 meters, with 2.8 grams: 



2 Cyathodonta pedroana 92.9% 



polychaetes 7.1 



In 338 meters, with 9 grams : 



polychaetes 76.7% 



1 Cyathodonta pedroana 23.3 



In 373 meters, sticky mud, with 406.9 grams: 



9 brissopsids 53.45% 



polychaetes 30.55 



mollusks with shells 9.98 



a thalassemid 4.25 



anemone 1.2 



all others, less than 1.0 



In 373 meters, silty mud, with 77.4 grams: 



2 Arhynchite 79.46% 

 polychaetes 13.56 



9 anemones 6.20 



mollusks 0.78 



In 376 meters, with 65.4 grams : 



2 Arhynchite 47.7% 



polychaetes, chiefly Nephtys and Spiophanes 43.9 



a sipunculid 3.4 



2 nemerteans 2.4 

 a ceriantharian 1.2 

 mollusks 0.8 

 all others, less than 1.0 



In 478 meters, with 143.8 grams: 



6 brissopsids 86.93% 



polychaetes 10.15 



3 Dentalium 1.25 



4 anemones 1.11 

 1 nemertean 0.56 



The preponderant weights of brissopsids, polychaetes and echiuroids 



is fairly constant in this canyon, in depths of 373 to 478 meters. 



Mugu canyon: — Total weights ranged from a high of 106.8 grams 

 in a sample to zero, in two deep samples, depths of 832 and 929 meters. 

 Rerated to grams per square meter, the results may be expressed as 

 follows : 



