140 HazeEN: NEW SPECIES OF LOBOMONAS 
: An unusually simple syst cilia contracted into a ball. 
Fic. 14. Cell in posterior polar v 
Fics. 15-20. Stages in coninsation of a pair of slightly unequal gametes: 
Fic. 15 at 1:45 P. M.; i IG. 16 at 2:15; Fic. 17 at 2:16; Fic. 18 at 2:25; FIG. 
19 at 2:40; Fig. 2 2:45. 
FIG. 21. . Noha by conjugation of equal walled gametes. 
PLATE 6 
LOBOMONAS ROSTRATA Hazen 
Fics. 22-27. Typical young vegetative cells. 
Fics. 28, 29. Mature cells of less common form, but with well developed 
wall, : IG. 29 showing edge view beak. 
G. 30. Anterior polar v 
cane 31, 32. Cells evel Si itmnce of form some time after loss of 
motility 
Fic. 33. Relatively large mature cell, pyrenoid and stigma underneath. 
Fic. 34. The same ry 24 hours later: four daughter cells completely 
organized except for cilia, 1 
1G. 35. One of the oa daughter cells, one day later, not very well 
formed, probably because of unfavorable conditions. 
Beginning of cleavage, after clockwise rotation of protoplast; 
9:30 P. M. 
Fic. 37. Similar division, after rotation of protoplast in vertical plane; 
10:30 P. M 
Fic. 38 cleavage just completed; 10:30 P. M. 
Secon 
Fic. 39. Eight deenysins cells (perhaps gametes) 6 P. 
Fic. 40. The same at 9:30 P. M.: daughter cells held gelatinized wall 
of mother cell: cell ¢ Saud out sluggishly at 8:30; at 10 Pp. M. cell b backed 
out presently rested on end, cilia downward as at 5}. 
G. 41. Mature cell from Shelburne, Vermont, August 3, 1921. All other 
ae from New Jersey material, in 1919. 
