342 University of California Publications in Zoology [Vol. 23 



APPENDIX II B 



List of Species Taken at "Albatross" Hydrographic Stations During the 



Years 1912 and 1913 



In order to present the physical data (temperature, salinity, and phase of 

 tide) obtained at such hydrographic stations as are correlated with the dredging 

 stations given in appendix III (p. 354), a number of stations at which no speci- 

 mens were taken have been included in this table. 



The methods and apparatus employed in obtaining these data are fully 

 explained in the report on the physical conditions (Sumner, 1914). Unless other- 

 wise specified, the collecting apparatus consisted of three tow-nets, used simul- 

 taneously from the ship's dredging cable and towed just below or within a few 

 feet of the surface. The three nets were a large intermediate (4-foot diameter) 

 net made of No. 000 grit gauze, and two smaller wing-nets with 14-inch diameter 

 hoops covered respectively with No. 12 and No. 20 bolting silk. 



The positions of these stations can be readily ascertained by means of the 

 "Beference Station" given in the second column of the table: the II stations 

 there cited are the so-called primary hydrographic stations plotted on plate 4; 

 the D (dredging) stations are plotted on plates 2 and 3. A summary of the 

 hydrographic stations having approximately the same position is given below. 

 The mean depth of all stations whose positions thus approximate has been included 

 in this summary as a matter of record, as the depths of hydrographic stations are 

 not otherwise given in this paper. 



Only the four returns most frequent with the tow-nets (Spirontocaris cristata, 

 Crago nigricauda, C. franciscorum, and the "crab megalopa") are given in the 

 vertical columns of occurrences; all others, the species more rarely taken, are given 

 in the column of ' ' Addenda. ' ' Fifty or more specimens are represented by the 

 letter "m" (many). 



