126 Universitij of Califoniia Publicalions in Zoology [Vol.15 



EXPLANATION OF TABLE 4 



All the soundings entered in this table were made with the Thomp- 

 son sounding machine (see p. 9) unless otherwise stated in the table. 

 Only those are given whose error is knoivn to be within two per cent 

 of the depth. 



First cohinin. — Number of sounding entered in chronological order. 



Second columti. — Date. 



Third column. — Time when the lead struck bottom entered to the nearest 

 minute; this enables comparison with collections made at nearly the same time 

 (see Appendix III). 



Fourth column. — Section; for explanation see page 46. 



Fifth and sixth columns. — Latitude and longitude; for error see pages 18 and 4.5. 



Seventh column. — Depth of bottom entered to the nearest meter above 300 

 and to the nearest five below that depth. 



Eighth column. — Character of bottom denoted by the abbreviations adopted 

 by the United States Coast and Geodetic Survey; thej' are explained in 

 Appendix IV. 



