38 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



Hueneme canyon: — Total weights of living animals, without tubes 

 but with shells of mollusks are given for each sample in the detailed 

 Analyses. These values are here rerated to grams to a square meter; 

 orange-peel grab samples are generally increased by a factor of 4 and 

 Campbell grab samples by 2, unless sample sizes dictate otherwise. 



In 98 m weights are negligible but penetration of the grab was 

 unsatisfactory. Other samples yielded the following: 



814 grams per sq.m., in 373 meters 261.4 gm/ sq.m., in 376 m. 



723.4 gm/ sq.m., in 183 m. 60.0 gm/ sq.m., in 165 m. 



625.6 gm/ sq.m., in 177 m. 36.0 gm/ sq.m., in 338 m. 



398.0 gm/ sq.m., in 209 m, 5.6 gm/ sq.m., in 271 m. 



309.6 gm/ sq.m., in 373 m. 5.0 gm/ sq.m., in 456 m. 



287.6 gm/ sq.m., in 478 m. wts. negligible in 621 m. 



Highest biomasses are correlated with kinds of sediments of silt or 

 mud, and lowest values with sand or pebbles. Ranging these values by 

 major groups of animals, the following percentages are obtained : 

 In 165 m, with 15 grams, chiefly Glycera and Pectinaria (polychaetes). 



In 177 m, with 156.4 grams: 



polychaetes (Asychis and 223 Heteromastus) 51.15% 



echiuroids (75 Listriolobus pelodes) 45.78 

 ophiuroids 1.53 



mollusks 0.77 



a nemertean 0.71 



all others, less than 1.0 



In 183 meters, with 183.1 grams: 



polychaetes, chiefly Glycera robusta 



and 245 Heteromastus filobranchus 90.66% 



5 nemerteans 5.79 



3 Listriolobus pelodes 3.11 



ophiuroids 0.33 



mollusks 0.11 



In 209 meters, with 99.5 grams : 



polychaetes, chiefly Travisia pupa, Asychis 



and Nothria pallida 50.8% 



mollusks, chiefly 12 Yoldia 26.5 



1 brissopsid 19.9 



2 sipunculids 2.3 

 ophiuroids 0.5 



