NO. 2 HARTMAN : QUANTITATIVE SURVEY 327 



3. Sta. 2843 (no. 220). Northern end of Lasuen sea mount, in 230 

 fms. OP(i took 1.32 cuft of grayish green sandy mud with little rubble 

 and numerous animals. 1 he lot included a small sea-whip, a nemertean 

 (2 large), amphipods (few), an isopod (1), a cumacean (1), ostracods 

 (3). Largest individual was Brissopsis pmifica and most abundant were 

 Nuciilana conccptionis (16), and Lysippe annectens (15). 



Numbers of species and specimens totalled : 

 polychaetes 20 species, 46 specimens 



echinoderm 1 5 



mollusks 8+ 41 



crustaceans 5"^ 7"^ 



others 2 3 



Total: 36^ species, 102"^ specimens 



4. Sta. 2887 (no. 221). Northeast end of Lasuen sea mount, in 284 

 fms. OPG took 2.89 cuft of gray-green mud with many foraminiferans 

 and small animals of few kinds. In addition to those listed on the chart, 

 an amphipod (3) and a cumacean (2) were present. Largest was a bris- 

 sopsid, and most abundant Nitidella permodesta (13). Most of the spe- 

 cies are those characteristic of slope depths. 



5. Sta. 2299 (no. 234). Southwest end of Lasuen sea mount, in 360 

 fms. OPG took a full sample of dark gray oozy mud with siliceous sponge 

 and many kinds of animals. In addition to those listed, there were present 

 a nemertean (1), and a sipunculid (1). Largest individuals were Thal- 

 anessa spinosa and Maldane sarsi. None was conspicuously abundant. 

 Number of species totalled about 16, and specimens less than 20. 



6. Sta. 2154-52 (near 228). Lasuen sea mount, in 300 fms. Biologi- 

 cal dredge, with tangles, pulling upslope on a rocky incline, recovered 

 coarse brown sponge, an alcvonarian, bryozoans encrusting rocks, a gala- 

 theid crab, and those species listed on the chart. Most, if not all, are 

 unique to this area, and may have their affinities with animals off the 

 deeper areas of Santa Catalina Island. 



Sixmile bank is a broadly elongate seamount, 6.5 nautical miles north- 

 east of Avalon, Santa Catalina Island ; it rises from a depth of 350 fms 

 to a flat top in 228 fms. It measures about 3.25 by 4.5 mi and covers an 

 area of about 15 square miles. It is located in the serial numbers 213, 214 

 and 228, 229. I hree samples were useful to indicate the kind of fauna. 



Sta. 2204 (near no. 228), in 230 fms, was a dredged one and took 

 rocks with attached ophiuroid, Ophincantha phrngnia, asteroids, and 



