Lemaire J, Richard A
Ann Endocrinol (Paris). 1979 Jan-Feb;40(1):91-2.
The sex differenciation in the gonad of the cuttlefish is only evident after the hatching, -- the "A" cells become spermatogonia or ovogonia. In the embryonic gonads, bigger cells called "B" seem participate in this differenciation (ultrastructural active aspects in concordance with sexual differentiation).