33. 



are replaced by either Canoer borealie (2) , Cerianthus 

 borealie (4) , the white sea pen (7) , or combinations of two 

 of these end-members, in slightly deeper water (200 to 300 

 meters). Eyalinoeaia avtifex (3), as well as Cancer horealis 

 and Cerianthus horeatis compose the faunal assemblage of the 

 next depth interval (300-500 meters) . In the shallower part 

 of the axis two end-members dominate the fauna. These are 

 the quill worm H. artifex (3) and two anemones Bolocera tuediae 

 (Fig. 13d) and a species of Cerianthidae (6). In both the 

 axis and on the walls of Baltimore Canyon three monospecific 

 end-members (1, 5 and 9) compose the faunal assemblage found 

 below 500 meters. These are two types of demersal fish, rat- 

 tails (1) , and the deep-sea eel Synaphobranohus kaupi (9) , 

 (Fig. 15b) , and the red crab Geryon quinquedens (5) (Fig, 15a) . 

 The gradual replacement of species across bathymetric contours 

 is characteristic of faunal trends found in slope habitats of 

 the continental margin (Appendix A) . 



Species similarity measures between different areas in 

 Lydonia Canyon yield some similarities with Baltimore Canyon, 

 but identify one major difference. Again, the shallow-water 

 assemblage is diverse and is accompanied by a somewhat less 

 variable deeper assemblage (Fig. 16) . The main difference is 

 that the substrate in the deeper parts of this canyon is quite 

 variable. The areas characterized by mixed substrate types 

 tended to cluster together, because of the presence of numerous 



