1908.] On the Maturation of the Ovum in the Guinea-pig. 287 
production of the second polar body (which he figures), to be merely the first 
segmentation of an egg which has entered upon a process of degeneration 
and the follicle of which is about to atrophy. 
DESCRIPTION OF PLATES. 
PLATE 5. 
Fig. 1.—Ovum of Guinea-pig. The nucleus in a late stage of synapsis. 
Fie. 2—Ovum of Guinea-pig, showing the spindle (first polar body or heterotype 
spindle). 
PLATE 6. 
Fie. 3.—Ovum of Guinea-pig. The nucleus is in the diaster of the meiotic division 
(z.e., the formation of the first polar body). The intermediate bodies of Flemming 
are also seen on the fibres at the equator of the spindle. 
Fie. 4.—Ovum of Guinea-pig, showing the post-meiotic spindle (polar view) and the first 
polar body. ‘The latter is itself in division. 
PLATE 7. 
Fig. 5.—Ovum of the Guinea-pig, showing diaster of meiotic spindle. 
Fia. 6.—Ovum of Guinea-pig, showing the post-meiotic spindle, or second polar body 
spindle. The first polar body has divided and its two daughter elements are together 
on the upper margin of the cell. 
