434 BOTANICAL GAZETTE [NOVEMBER 
Fic. 4.—Cross-section of chromatophore showing grains of starch in 
ioe tape 
G. 5.—Same as fig. 4. 
he. 6.—Same a ae a 
Fic. 7.—Optical section of chromatophore _—e several smaller starch 
grains in periphery of plastid. 
Fic. 8.—Optical section of chromatophore showing minute starch grains 
in periphery of plastid, a pyrenoid of unusual extent and shape, and many 
starch grains which vary greatly in shape and length. 
Fic. 9.—Median longitudinal section of chromatophore chawhig several 
small starch grains. 
Fic. 1o.—Same as fi 
. 11.—Cross-section of cell showing chromatophore in cross-section. 
Fic. 12.—Same as fig. 9. 
Fic. 13.—Same as fig. 9 
14.—Optical section of chromatophore showing another pyrenoid 
of unusual shape, and starch grains of several different lengths. 
Fic. 15.—Optical section of chromatophore showing many small starch 
grains near periphery of plastid, and large grains which differ in shape because 
of width of bases. 
Fic. 16.—Same a 
15. 
Fic. 17. etry section of plastid in process of division, showing pyrenoid 
after it ee divided. 
. 18.—Optical section of plastid in process of division before pyrenoid 
has sores division. 
