452 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 19 



PLATE 12 



Top. Seahnttom at Sta. 7712, basin slope southeast end of Santa 



Catalina Island, in 133 fms, coarse black sandy sediments, 

 showing patch of ophiuroid arms at far right, and crescentic 

 depressions formed by brissopsid urchins; the large trail across 

 lower left has not been identified. 



Bottom. The larger organisms from Sta. 7712, including Hiissopsis 

 pacifica, and tubes of polychaetes; the scale at bottom refers 

 to these organisms. 



