338
ELVEZIO GHIRARDELLI
FIG. 30. Diagrammatic drawing o f the ovary of 8. bipunctata with an egg in the teniporary oviduct. The egg lies between the epithelium ep and the syncytium s of
the seminal pouch ; sp spermatozoa in the seminal pouch.
exerted by the walls of the oviduct. Between one egg and the other
there is a liquid, easily coagulable and strongly eosinophilic.
The second maturation division generally occurs in the lumen of the
temporary oviduct. It must be remembered that, when the eggs pass
through thc temporary oviduct, the spermatozoa have already entered
into them (see page 299). The spindles are characteristic non-convergent
spindles. It is possible that each chromosome may be polarized
independently (Fig. 32). Dallot (1966) believed that the expulsion of
the eggs is brought about by inner contractions of the ovarian wall,
and he thus confirmed the observations of Conant (1896) on S. hispidn.
On the other hand, Stevens (1910) in 8. bipuwtata and Ghirardelli
FIG. 31. Sagitla bipuizctata: transverse section o f the ovary with two eggs in the
temporary oviduct. The supporting crescent ep has been reversed backwards. The
arrow indicates the first spindle; i intestine; ms muscular wall o f the body.
ELVEZIO GHIRARDELLI
FIG. 30. Diagrammatic drawing o f the ovary of 8. bipunctata with an egg in the teniporary oviduct. The egg lies between the epithelium ep and the syncytium s of
the seminal pouch ; sp spermatozoa in the seminal pouch.
exerted by the walls of the oviduct. Between one egg and the other
there is a liquid, easily coagulable and strongly eosinophilic.
The second maturation division generally occurs in the lumen of the
temporary oviduct. It must be remembered that, when the eggs pass
through thc temporary oviduct, the spermatozoa have already entered
into them (see page 299). The spindles are characteristic non-convergent
spindles. It is possible that each chromosome may be polarized
independently (Fig. 32). Dallot (1966) believed that the expulsion of
the eggs is brought about by inner contractions of the ovarian wall,
and he thus confirmed the observations of Conant (1896) on S. hispidn.
On the other hand, Stevens (1910) in 8. bipuwtata and Ghirardelli
FIG. 31. Sagitla bipuizctata: transverse section o f the ovary with two eggs in the
temporary oviduct. The supporting crescent ep has been reversed backwards. The
arrow indicates the first spindle; i intestine; ms muscular wall o f the body.