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ELVEZIO OHIRARDELLI
FIG. 24. Spadella cephaloptera. Successive phases of the migration of the spermatozoa
from the region of the neck where the spermatophore spf is placed behind the
corona co towards the seminal receptacles s.r. ; V.S. seminal vesicles ; el. collarette.
(From Ghirardelli, 1954a.)