16 Wisconsin Academy of Sciences, Arts, and Letters. 
more pronounced in figures fourteen and fifteen where the 
plasma membrane is in contact with the blepharoplast through¬ 
out 
Just after the stage represented in figure thirteen, the nucleus 
also begins to decrease in volume. The network of chromatin 
becomes more dense, the threads forming the meshes becoming 
shorter and thicker. Apparently an extrusion of nuclear sap 
takes place along the inner side of the nucleus, resulting in the 
formation of a series of large vacuoles in the cytoplasm on the 
concave side of the nuclear membrane (figure 15). The irreg¬ 
ular, somewhat angular contour of the inner side of the nucleus 
as drawn in figure thirteen is changed to the smooth curve that 
is shown in figure fifteen. 
In figure fourteen, the position of the nucleus corresponds to 
that in figure eleven and the stage represented is intermediate 
between that of figures thirteen and fifteen. The curvature of 
the nucleus was followed in making this drawing. The 
blepharoplast which is in the form of a broad band around the 
convex side of the nucleus, is represented in cross section twice, 
once at each end of the drawing of the nucleus (figure 14, a 
and b). There is, as can frequently be seen in this and later 
stages, a distinct space between the nuclear membrane and the 
blepharoplast. The cross section of the blepharoplast is un¬ 
equal in thickness and somewhat ragged in outline. From this 
time on, the band is often wider than the nucleus—projecting 
beyond the borders of the nuclear spiral. The nucleus at this 
stage forms about one coil of a counter-clockwise spiral as 
seen under the microscope. 
In figures sixteen to eighteen, are shown three cells in differ¬ 
ent positions, in which the spiral is a coil and a half in length. 
In figure sixteen, the anterior end is uppermost and in the 
drawing the plane of the nuclear coil is followed down and 
around to the posterior tip. Other views of the same stage are 
given in the next two drawings (figures 17, 18). Both are 
side views of the nuclear coil corresponding to that shown in 
figure fourteen. With the elongation of the nucleus and 
blepharoplast, a curved horn-shaped projection of the cell is 
formed which will be the anterior end of the antherozoid (fig- 
