42 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



In 652 rrteters, with 8.1 grams: 



an echinoid 76.54% 



polychaetes 20.99 



nemerteans 2.47 



In 7 1 1 meters, with 1 8.4 grams : 



polychaetes 76.1% 



2 echiuroids 20.6 

 a ghost shrimp 3.3 



In 741 meters a ghost shrimp weighed 3.0 grams and all other 

 animals were negligible. In 905 meters there were no living animals. 

 The brissopsids belonged chiefly to 2 species: Brisaster townsendi 

 and Brissopsis pacifica, and the echiuroid to Arhynchite sp. 



Santa Monica canyon: — Total weights of animals were highest in 

 268 meters but nowhere approached the high values of Hueneme 

 canyon. The values, rerated to grams to a square meter are as follows: 



165.2 gm/ sq.m., in 268 m. 17.7 gm/ sq.m., in 810 m. 



1 10.8 gm/ sq.m., in 454 m. 10.4 gm/ sq.m., in 463 m, 



81.72 gm/ sq.m., in 330 m. 8.8 gm/ sq.m., in 183 m. 



58.8 gm/ sq.m., in 583 m. 8.56 gm/ sq.m., in 431 m. 



43.2 gm/ sq.m., in 475 m. wts. negligible in 542 m and 



33.2 gm/ sq.m., in 362 m. in 612 m, and zero in 873 m. 



18.4 gm/ sq.m., in 116 m. 



Sample sizes were moderately large in all but one, from 116 meters 

 where sediments were sandy silt ; this bottom was unique for having 

 unusually large numbers of Capitella capitata subspp. ; this is not 

 significant as a weighted form but indicates a disturbed or unnatural 

 bottom. 



Summaries by major groups of animals show the following per- 

 centages : 



In 116 meters, with 9.2 grams: 



Solemya, a clam 42.4% 



other mollusks 57.6 



In 183 meters, with 4.4 grams: 



Solemya and other mollusks 65.9% 



polychaetes 34.1 



In 268 meters, with 41.3 grams: 



3 Arhynchite sp. 72.2% 

 polychaetes 27.8 



