254 



HI, 



[NoYEMBKK 



posterior part of the cell and is slightly orange in color, the rest of the 

 cell being colorless. Cilia are directed forward in Bwimming. 



A 



Fio. 2. liryopsis hupnotdes. X 650. A, Male and female gametes in portion of 

 branch. B, Exit pores in side of branch. C. Male and female gametes. D. Ger- 

 minating zygote. 



The female gametes are more egg-shaped and much larger than the 

 males. In structure they are similar save for a slight yellowish cast to 

 the chloroplast. 



On fusion the pair settle down and zygotes of irregular shape are 

 formed, which show some metabolic movements. 



The phenomena of germination were not observed except for an 

 increase in the size of the zygote. 



The Bryopsidaceae are prevailingly dioecious, so that the mon- 

 oecism observed in Bryopsis kypnoides is exceptional in the family. 

 The length of the cilia is also exceptional in this species. It varies 

 from slightly longer than, to more than twice as long as, the cell. — J. 

 B. Lackey. 



Ectocarpus Mitch ella e Harv. var. parva s. var. Thallns 

 caespitose, attached, 8-12 mm. tall. Interlacing decumbent basal 

 filaments giving rise to the primary erect filaments (of 22 [L average 

 diameter) seldom branched. The few lateral secondary branches 

 scattered, largely on the distal half of the primary, with average 

 diameter 1(1 (x at the base, and produced into short hairlike tips. Plu- 

 rilocular sporangia sessile, erect on the upper side of the second- 

 ary branches, cylindrical, obtuse, composed of a few large cells each 

 producing one round or slightly oval motionless megaspore. Sporangia 

 average (i();j. long by 1(1 ;x broad, and spores 12 ;jl in diameter. 



During the last week of July, 1919, the collectors of the IT. S. Fish- 



