92 THE PHYLOGENY OF THE GENUS BRACHIOMONAS 
Fic. 31. Cell on which the ‘‘bumps” representing !ateral arms are un- 
developed. 
Fic. 32. Anterior polar view of similar cell. 
Fic. 33. Protoplast ertracted from one of the “‘bumps” (osmic vapor). 
Fic. 34. Large older cell with more posterior Lees id. 
Fic. 35 Eight zoospores in motile cell; 12:45 A 
Fic. 36. Four zoospores in motile cell. 
Fic. 37. Young zoospore free; chromatophore filling posterior horn. 
Fic. 38. Three of the four zoospores have escaped through a triangular 
rent in the wall of the mother cell. 
Fic. 39 Similar to Fic. 31, but with more typical position of pyrenoid 
(osmic vapor) 
Fic. 40. Thirty-two gametes in motile mother cell; 10 A M 
Fics. 41, 42. Gametes at beginning of conjugation (osmic vapor). 
Fic. 43. Motile zygote, momentarily resting; nuclei not fused. 
Fic. 44. Zygote, cilia having disappeared, nuclei fused; two stigmata still 
present. 
Fic. 45. Zygospore twenty-four hours after conjugation. 
In the living = the pyrenoid a appears upon casual 
observation to be n because imbedded in the green chrmatophore It 
is believed, Laer tat the printing of ie pyrenoids the same sepia 
as the cell-wall and protoplasmic outlines represents more truthfully their 
real nature 
Note. As fina] proof of this paper is received, the writer has 
just made a mid-April excursion to the Massachusetts coast, 
where he has collected typical Brachiomonas submarina Bohlin 
from Cape Ann to Buzzards Bay, at Rockport, Gloucester, 
Marblehead, Nahant, and Fair Haven. There has been no in- 
dication of other species of Brachiomonas or of Chlamydomonas 
caudata at these stations. 
