In C. nigrescens and in some other species a zooid may contain a pair of ovaries, a pair of testes, or an ovary and a testis, although the males, females and hermaj phrodites do not differ from one another in external characters.
The testes, which correspond in ?t " te e 'm' ms 's,' c position with the ovaries of a female Cephalodiscus, constitute the greater part of the animal.
The body bears tentacles, but shows no division into hydrorhiza, hydrocaulus or hydranth; it is temporarily fixed and has no perisarc. The polyp is usually hermaphrodite, developing both ovaries and testes in the same individual.
Both right and left testes are functional.
Gonads limited in number of pairs, testes and ovaries always present in the same individual.
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