46, 



The depth range of C. bovealis is between 100 to 600 meters, 

 while the depth range of G. quinquedens is from 300 to greater 

 than 1100 meters. The abundance of the red crab G. quinquedens 

 is never as high as that of C. borealis however, its concen- 

 tration in localized areas can be exceedingly high. 

 G. quinquedens is frequently found in areas of semi-consolidated 

 clay where it burrows extensively, occasionally causing large 

 tunnel-like excavations. Even though the depth ranges of both 

 of these crabs overlap, they are rarely seen in high abundances 

 in the same area. This may be the result of habitat differ- 

 ences or of competition between the two species. 



Corals 



Corals (primarily alcyonarians) are found in all three of 

 the canyons surveyed, and include a wide variety of types, 

 sizes, and growth forms. Both scleractinians (hard corals) 

 and alcyonarians (soft corals) are seen. The scleractinians 

 range from small delicate solitary cup corals to large anas- 

 tomosing colonies. Alcyonarians range from small non-descript 

 sea pens to massive branching colonies that are several meters 

 in height. A taxonomic description of the more common alcyo- 

 naria found in the study area may be found in Appendix B. 

 A description of the scleractinia encountered in this study may 

 be found in Appendix C. 



