Katharine Foot and E. C. Strobell 369 
~ 
Puoro. 7. Section (214%4,,) of odcyte, second order, showing male attrac- 
tion-sphere with posterior end of middle-piece in the center of the sphere 
(overstaining has obliterated the granule). The middle-piece is intact 
and still attached to the head, part of which appears in this section. The 
rest of the head is in two neighboring sections. Fixative chromo-acetic. 
X 1000. 
PuHoTo. 8. Section (34) oocyte, second order, showing male attraction- 
sphere with posterior granule of middle-piece in the center of the sphere. 
The middle-piece is intact, and still attached to the head, part of which 
appears in this section. The rest of the head is in three neighboring. 
sections. Fixative corrosive sublimate. X 1040. 
PuHoTo. 9. Section (2%,,) of odcyte, second order, showing male attrac- 
tion-sphere with posterior end of middle-piece in the center of the sphere. 
The middle-piece is intact, but separated from the head, part of which 
shows in this section. The rest of the head is in the next section. Fixa- 
tive corrosive sublimate. XX 1000. 
Porto. 10. Section (3y) of polysperm odcyte, second order, showing one 
of the male attraction-spheres and part of the tail of the spermatozo6n 
attached to a granule, which must be the posterior granule of the middle- 
piece. Fixative Hermann’s fluid. X 1000. 
PuHoTo. 11. Section (2,,) of odcyte, second order, showing male attrac- 
tion-sphere with one end of middle-piece in center of the sphere. The 
rest of the middle-piece shows in the next section as a tiny rod with the 
opposite end near the periphery of the sphere. Fixative Flemming’s fluid 
without acetic acid, * 1000. 
PHOTO. 12. Section (2,,) of odcyte, second order, showing male attrac- 
tion-sphere with middle-piece, one end of which is in the center of the 
sphere. The end at periphery of sphere is nearest the head of spermato- 
zoon, which is in neighboring sections. Fixative Flemming’s fluid, with- 
out acetic acid. X 1000. 
