342 University of California Publications in Zoology (Vou. 23 
APPENDIX II B 
List oF Species TAKEN AT ‘‘ ALBATROSS’’ HYDROGRAPHIC STATIONS DURING THE 
YEARS 1912 anp 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 
‘‘Reference Station’’ given in the second column of the table: the H 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 )): 
