NO. 2 OLGA HARTMAN: SUBMARINE CANYONS 57 



below this depth, but after 708 meters a deep water fauna was present, 

 with large numbers of specimens. Coronado canyon followed a pattern 

 of continued decrease in numbers with depth. Santa Cruz canyon 

 had an upsurge in numbers at 459 meters, where two species of cir- 

 ratulid polychaetes accounted for much of the increase. Catalina canyon, 

 in 559 meters, had 27 species and 678 specimens, the high numbers 

 resulting from peak numbers of an ampharetid. In Tanner canyon, at 

 644 meters, 27 species with 135 specimens were mainly due to the 

 presence of various deepwater species. 



In most cases cited, an approximate areal coverage by numbers per 

 square meter might be ascertained by increasing the figures by a 

 factor of 2 to 4, depending on the size of the original sample. 



The following lists give the numbers of all species and specimens, 

 together with polychaete species and specimens, by name of canyon, 

 depth in meters, and station numbers as logged by the Research Vessel, 

 VELERO IV : 



