STUDIES ON MARINE DIATOMS AND DINO- 



ELAGELLATES CAUGHT BY AID OF 



THE KOFOID BUCKET IN 1922 



BT 



WINFRED EMORY ALLEN 

 (Contribution from Scripps Institution for Biological Research of the University of California) 



INTRODUCTION 



This is the second paper in an annual series dealing with material 

 collected by boat at two certain stations located respectively ten and 

 five miles directly seaward from the pier belonging to the Scripps 

 Institution, about seventeen miles from San Diego, California. The 

 methods of work were the same as in 1921 (Allen, 1923) and the 

 routine was nearly the same. The most important change in collect- 

 ing was the addition for each day of a closing bucket catch at the 

 depth of forty meters. The operations occupied parts of May, June, 

 and September. 



The boat (the Kaiyo) usually left the pier about 5:30 a.m. and 

 ran directly to Station I, ten miles out. There the work of collecting 

 micro-plankton was adapted to the requirements of the hydrographic 

 and other observations, but in most cases the Kofoid closing bucket 

 was lowered to the forty meter level by a little after 7 :00 a.m. After 

 being emptied through the filtration net of No. 25 silk bolting cloth 

 it was filled at the twenty meter level. Lastly, it was used in taking 

 a sample of water at the surface except when that sample could be 

 more conveniently taken by dipping with an ordinary pail. Since 

 the Kofoid bucket contains five gallons of water that was the amount 

 uniformly filtered. 



The same order of sampling was afterwards followed at Station II 

 located five miles out. Sometimes the order was varied at one or 

 both stations and occasionally sampling was done between the stations 

 or at depths other than those mentioned above. 



