THE DEVELOPMENT OF THE ANTHEROZOIDS 
OF ZAMIA. 
HERBERT J. WEBBER. 
In the June number of this journal the writer discussed some 
of the phases of development of the pollen tube apparatus of 
Zamia integrifolia. The generative cell was traced through its 
migration and division up to the time of the breaking down of 
the centrosome-like body. The discovery of motile antherozoids 
was also announced, but the method of their development was 
not explained. 
Since then further observations have shown that each of the 
daughter cells, formed by the division of the generative cell, 
develops into a motile antherozoid, two thus being formed in 
each pollen tube; and that they are encircled by a spirally 
arranged band of cilia developed in a very novel way from the 
fragments of the centrosome-like body. In the present prelim- 
inary paper these features will be considered, together with a 
short account of observations on the movements of the anther- 
ozoids. 
The membrane formed by the wall of the centrosome-like 
body in its disintegration evidently does not separate into two 
fragments, as I was at first inclined to think,? but forms a single 
somewhat contorted membrane or band which at this time lies 
free in the cytoplasm of the cell. In its further development 
this membrane becomes greatly extended in length, growing in 
such a manner as to forma spiral band or ribbon which meanwhile 
moves outward and becomes closely appressed against the 
Hautschicht of the cell. The first turn of the band is located 
near the equator of the cell nearly at right angles to the direc- 
"WEBBER, HERBERT J.—Peculiar structures occurring in the pollen tube of 
Zamia. Bort. GAZ. 23:453. 1897. 
* OF, crt., Fl. XL fe: 10. 
16 [yULY 
‘7 
