VN 12 Ree eee 
Cao Oe = ey ee pee eee PC dy een aE es Berg a tt nah TNN 
Ae eas kk ti atic, tea eee 
1912] GRIGGS—RHODOCH YTRIUM 173 
Fic. 44.—A nucleus from a half-grown zoosporangium; nucleolus with a 
single central vacuole; connections between the chromatin spherules unusually 
well developed; X 2000 
Fic. 45.—Enlarged sheets of the nucleus of fig. 15; 2000. 
Fic. 46.—A nucleolus with many small vacuoles; X 2000. 
IG. 47.—A nucleolus in which several small vacuoles have coalesced into 
a single eae vacuole; X 2000. 
Ic. 48.—The beginning of prophase from a tetranucleate cyst in . which 
the ae three nuclei were well advanced in mitosis; < 2000. 
IG. 49.—Early prophase in the primary iicleas X 2000. 
Fic. 50.—Later prophase . ss primary nucleus; no indication of the 
opposite pole could be found; 
IG. 51.—Prophase in a FSeor cyst, showing formation of the second 
pole of the spindle and of the spirem; X 2000. 
Fic. 52.—Late prophase with spirem entirely within the spindle; third 
division; 2000 
Fic. 53. i Metachases in primary nucleus, showing chromosomes, masses of 
residual chromatin, and irregular disposition of fibers through nuclear cavity; 
aster at one pole largely accidental; X 2000. 
Fic. 54.—Metaphase; spindle beginning to elongate, but spirem not yet 
completely segmented into chromosomes; third division; X 2000. 
IG. 55.—Anaphase, showing elongation of spindle. and residual chromatin; 
fourth division; X 2000. 
Fic. - —KEarly telophase; probably fifth or sixth division; X 2000. 
Late telophase, — persistence of outline of primary 
IG. 
ea yo division; X 2000 
. 58.—Late prophase in an intermediate nucleus; residual chromatin 
aes finely divided; X 2000 
Fic. 59.—Metaphase in ide nucleus; no residual chromatin; X 2000. 
Fics. 60, 61.—Resting nucleus and prophase of second type of mitosis 
from the same cyst; 2000. 
Fic. 62.—Metaphase, second type of mitosis; X 2000. 
Fics. 63-66.—Telophases, second type of mitosis; > 2000. 
Fics. 67, 68.—Cysts with irregular nuclei which are interpreted as the 
products of amitosis; x 334. 
