A-20 



abundances (300-400 individuals/100 m^) where it occurs. 

 ALVIN dive 767 covered a depth range of 8 50 to 1250 meters 

 in the same area. At all depths within this range fish com- 

 prise the majority of the epifauna seen. The most abundant 

 of these was the deep-sea eel Synaphobranahus kaupi 

 frequently seen hovering just above the bottom. The main 

 crustacean in this region was the deep-sea red crab Gevyon 

 quinquedens with most of them seen as mating pairs. ALVIN 

 dive 766 covered the depth range from 1550 to 1800 meters. 

 Throughout this dive the predominant animal was the ophiurid 

 Ophiomusium lymani . 



Figure C3 shows the dominant faunal constituents seen 

 on ALVIN dive 807 covering the depth range from 1000 to 1350 

 meters on the slope north of Norfolk Canyon. Again fish 

 accounted for the majority of the fauna seen. The dominant 

 crustacean found between 1000 to 1050 meters was Geryon 

 quinquedens which burrowed extensively in the consolidated 

 clay bottom as evidenced by numerous large excavations. A 

 species of the solitary cup coral Flabellum was seen in high 

 concentrations in the 1300 to 1350-meter depth interval. 



The general trend of gradual replacement of crustaceans 

 and fish by echinoderms with increasing depth is somewhat 

 obscured in canyons. This is probably the result of greater 

 environmental heterogeneity in canyons due to more substrate 

 variability. Additionally, canyons have been identified as 

 nutrient enriched environments (Rowe, 1971; Haedrich, Rowe 



