26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



A dredged sample from 100-300 meters, sta. 7175-60, centered at 

 33° 39' 34", 118° 18' 12", yielded about 4.5 cuft of green silt, 

 sand, a long boulder about 1 x 2 ft, and gray-brown layered shalestone. 

 The largest animals are . Travisia pupa, and the most abundant are 

 Chloeia pinnata, Goniada brunnea, Lumbrineris spp., Sthenelanella 

 uniformis, Nothria iridescens and other kinds of polychaetes. There 

 are sparse numbers of nemerteans, echiuroids, amphipods, sipunculids, 

 some solenogaster mollusks and no visible echinoderms. In all 48 kinds 

 of polychaetes are named (see ANALYSES) ; they could be dis- 

 tinguished as having come from mud, from sand and mixed bottoms — 

 a result of using a dredge over an area known to have closely pat- 

 terned sediments. 



Another dredged sample, sta. 7161-60, at 33° 3T 50", 118° 16' 

 44" to 33° 31' 27", 118° 16' 18" in 240-280 meters, yielded about 

 4 cuft of green sandy silt with many animals, of which the most 

 conspicuous were echinoderms. Largest individuals are brissopsid echi- 

 noderms, a cancroid crab, Leptosynapta albicans, and tremendous 

 numbers of Chloeia pinnata, with large Goniada brunnea. 



NEWPORT CANYON 



Thirteen samples (Fig. 9) were taken in 16 to 642 meters, In its 

 shallowest part this canyon contains a considerable amount of woody 

 debris and other biological detritus. At 16 m commensal pinnotherid 

 crabs are unusually abundant, together with many different kinds of 

 small polychaetes, chiefly cirratulids, spionids and Haploscoloplos elon- 

 gatus. At 37 meters the largest animals are an enteropneust, Schizo- 

 cardium sp., and Glycera spp., with many smaller polychaetes, chiefly 

 cirratulids and spionids. At greater depths in less than 100 m, sedi- 

 ments are silty and support diversified kinds of animals, mainly poly- 

 chaetes. At greatest diversity there are 110 species and 611 specimens 

 in a sample, of which the most conspicuous are Pectinaria and 

 Heteromastus filobranchus. Biomass values range from 21.5 grams 

 per sample in 140 meters, to 83 grams in 83 meters. Where sediments 

 are somewhat sandy, nephtyids, Pectinaria and Dentalium thrive. 

 Where they are mud, Pista disjuncta, onuphids, large nemerteans and 

 ophiuroids prevail. At about 400 meters the fauna is characterized by 

 the presence of brissopsids, Arhynchite, ceriantharian anemones, deep- 

 water polychaetes, and mollusks, especially Saxicavella and Mitrella 

 permodesta. The deepest sample, in 642 m, yielded a large ophiuroid, 

 Asteronyx loveni. 



