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Biol Bull 76: 80-89. (February 1939)
© 1939 Marine Biological Laboratory
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EGG LAYING IN THE ACOELOUS TURBELLARIAN POLYCHOERUS CARMELENSIS

HELEN M. COSTELLO 1 and DONALD P. COSTELLO 1

1 From The Hopkins Marine Station of Stanford University and the Zoölogy Department of the University of North Carolina

The egg-laying habits of Polychoerus carmelensis are described, with especial emphasis upon the path of emergence of the eggs.

The mature eggs pass from the two vitellaria ventrally and medially between the ventral integument and the bursa seminalis, and emerge to the exterior through a median rupture at the level of the bursa.

The jelly mass is secreted by the entire surface of the animal during repeated rotation, head over tail. The eggs emerge during rotation, probably aided by violent muscular contractions observable at this time.

The entire process of egg laying requires five or six minutes.






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Copyright © 1939 by the Marine Biological Laboratory.