A-31 



Pennatula sp. and Acanella arhusoula all show a general 

 pattern of emergence with increasing latitudes (Figures D3 

 and D4). Voucher specimens of individuals from both the 

 southern and the northern populations are required to deter- 

 mine if they are in fact composed of the same species. 

 Additionally, without more detailed information on the fine 

 scale substrate and current regimes, it is impossible to 

 determine what factors are controlling the distribution of 

 these corals. 



The fauna of the deeper portion of the study area 

 ( 1600 m) is dominated by two end-member assemblages, the 

 ophiurid Ophiomusium lymani (1) and the urchin Echinus 

 affinis and a cerianthid anemone (7). These two end-members 

 are independently distributed. Qualitative observations 

 made during the photographic review note that although all 

 three of these species occur in the same area, when Ophio- 

 musium lymani was particularly abundant the other two were 

 not. Conversely, where the cerianthid anemone was locally 

 abundant 0. lymani was not. 0. lymani is found at depths 

 ranging from 1100 to 2500 meters, with peak abundances near 

 1800 meters. This ophiuroid was frequently seen at the 

 base of sea pens and gorgonian colonies. It is not known if 

 the ophiuroid is merely responding to structural hetero- 

 geneity in its environment or whether there is a beneficial 

 association between the two. The burrowing cerianthid is 

 found at depths ranging from 600 to 3200 meters, with peak 



