71. 



1000 meters the fauna is frequently dominated by 

 shrimp, and occasionally by Geryon quinquedens and 

 Synaphobranahus kaupi. 



(3) In terms of trophic types the fauna of Lydonia 

 Canyon differs from that found in Baltimore Canyon 

 in the middle depth range. The shallow water fauna 

 is again composed of a variety of trophic types. 

 Below 400 meters a higher proportion of the fauna 



is composed of filter-feeders, namely various species 

 of corals and sponges. 



(4) The coral populations in Lydonia Canyon are diverse 

 and abundant. Eunephthya florida is the most abun- 

 dant coral found in this canyon and is c6mmon on 

 the east wall along the axis. Fennatula aauleata 



is found in quite high concentrations in the shallower 

 part of the axis (around 500 m.). Other common 

 corals found in this canyon are Pavamurioea gvandis^ 

 Aaanthogorgia avmata and Paragorgia arborea. Most 

 of the corals found in this canyon are species that 

 are restricted to hard substrates. 



Oceanographer Canyon 



Of the three canyons surveyed Oceanographer Canyon 

 exhibited the highest degree of substrate variability. It 



