NO. 2 HARTMAN : QUANTITATIVE SURVEY 339 



8. Sta. 2393 (near no. 21 1 ), in 250-270 fms. Trawl took kelp hold- 

 fasts, rubbly sand and rocky debris. The animals taken are those charac- 

 teristic of a rocky bottom. Echinoderms (not identified) included echi- 

 noids and ophiuroids. Crustaceans were represented by a few amphipods, 

 an isopod and a crab. 



Isthmus Cove 



1. Isthmus Cove, in diving depths along the rocky north wall, was 

 sampled Nov. -Dec. 1965 (coll. Mr. Robert Given) ; part of an encrust- 

 ing colony of the serpulid, Spirohranchus spinosus, yielded an association 

 of animals (see chart) ; the long-spined echinoid, Centrostephanus coro- 

 natiis, occurs in rocky pockets along the wall. 



2. Intertidal holdfasts of kelps, Eisenia arborea, and larger kelps 

 (coll. Mr. Robert Given) yielded characteristic animals (see chart) 

 with grapsid and pagurid crabs. 



3. Sta. 2452 (no. 207) near Isthmus, in 28 fms. OPG took 0.37 cuft 

 of compact sandy clay with many animals and much calcareous debris. 

 In addition to the species named in the chart, a burrowing anemone (2), 

 two nemerteans (2), Phoronopsis calif ornica, red in life (1), Glottidia 

 albida ( 1 ) , many amphipods and other small crustaceans, several ascidi- 

 ans and an enteropneust ( 1 ) were present. The largest species was 

 Lanicc conchilega ; none was conspicuously abundant. Total number of 

 species was estimated at more than 60, with polychaetes about 30, echi- 

 noderms at least 2, mollusks 15, crustaceans many, and others, 8 or more. 



A concentration of Laqueus californicus is believed to exist along the 

 rocky exposures between Empire Landing and Ship Rock, in 30 to 70 

 fms, indicated by concentrations of dead shells in these areas. Several 

 probes (4a-4f) were attempted to procure living lamp-shells; the fol- 

 lowing stations indicated their presence, with associated organisms: 



3. Sta. 2955 (near no. 186). SW of Ship Rock, in 34 fms. The 

 dredge took sand, rock, shells of Laqueus, Tcrebratalia, Lytechinus and 

 other echinoderms, together with Conus californicus; the echinoderms 

 included : 



A mphiodia urtica O phiopsila calif ornica 



A mphipholis pugetana Ophiopteris papulosa 



Luidia asthenosorna Ophiothrix spiculata 



Luidia foliolata Sclerasterias heteropaes 

 Ophiopholis bakeri 



