1922] Allen: Studies on Marine Phytoplankton at La Jolla 



343 



no means was found to protect it from rough seas and it was only in 

 operation for a short time. For that reason records of currents are 

 made from observations at times of taking catches. 



Thirty-seven forms of dinoflagellates are listed as occurring within 

 the four months in sufficient numbers to deserve separate mention. 



m 

 3 6 



CO 



Sis 



21- 

 86 



2 16 



*> 



21 



§ 11- 



m 16- 



El 



26 



1- 

 O 



m 6- 

 O 



5 li- 

 es 

 m 16 



X3 

 21 



26 



r# a. 



Graph sAov/'ncf everao'e 

 number? of oino/Uae/Zate 

 ce//p per //£e/- /n tuczeuive 

 five </au per/oo/s JArouo'A 

 fast four monfA? of/9/ff. 

 F&cn sffu&re mi'/A'/rtefer of 

 6/scA area represents 900 

 c/i'rtoffecfe /<c? fes ■ 



Of these only eight had specific characters sufficiently well marked to 

 make identification easy. Twelve forms could be sometimes satisfac- 

 torily identified and usually approximated, i.e.. confusion was limited 

 to only one or two other forms. Of the other twenty-five, some were 

 always doubtful and a few were simply grouped under the genus 

 name because of small numbers or uncertainty of identification. 

 There was more or less difficulty in identifying species in all genera. 



