13 



less constantly associated with certain kinds of sediments. 

 Such are the epifaunal Chloeia pinnata (an amphinoraid 

 annelid) and the tubicolous Pectinaria calif orniensis 

 (the cone worm) on sandy or silty bottoms and in shallow 

 to fairly deep water, Ampharetids ( Amphi ct ei s , Ama^e ) , 

 Maldane , Nothria pallida and some terebellids are associated 

 with soft muddy bottoms in shallow to greater depths. 

 Species of Glycera , Ampharete , Qnuphis nebulosa , 

 Phyllochaetopterus prolif ica with attached Scalpellum 

 (stalked barnacle), Pherusa capulata j Isocirrus planiceps ^ 

 and some other kinds are most frequent in mixed bottoms, 

 especially where coarse sand or gravel prevailso Rocky 

 bottoms support such attached forms as solitary coral, 

 Corynactis (an anemone), various attached serpulid worms, 

 and crevice or nestling kinds as chitons, various other 

 mollusks, and scale wormSo Some of the rocky areas of 

 the upper end of Santa Monica Canyon show evidence of 

 former colonies of pholad mollusks, for which occupants 

 have not been recovered. These rocks are now inhabited 

 by borers of smaller dimensions such as sipunculid, a 

 small clam, Saxicava arctica , a sabellid worm, Hypsicomus , 

 and otherSo In deep water, wood may be penetrated by 

 another boring mollusk, Xylophaga o 



Near effluent outlets, the kinds of bottoms have 

 largely determined the kinds of animal associations. 

 In coarse, mixed bottoms with little or no current, as 

 at Hyperion, the conspicuous animal is Diopatra ornata. 



