Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 SEXUAL ORGANS OF CCELENTEEATA. 123 § 07. The generative organs of the Anthozoa are very similar in cha- racter. They are connected with the gastric cavity, so that the gene- rative matters pass to the exterior through the gullet. The septa of the gastric spaces, or their ridges, which project into the central stomachal cavity, generally function as organs of this kind. In the Alcyonarians the sexual products are formed at the free edge of these processes, either in the stomach or at some d
Elements of comparative anatomy (1878) Elements of comparative anatomy elementsofcompar00gege Year: 1878 SEXUAL ORGANS OF CCELENTEEATA. 123 § 07. The generative organs of the Anthozoa are very similar in cha- racter. They are connected with the gastric cavity, so that the gene- rative matters pass to the exterior through the gullet. The septa of the gastric spaces, or their ridges, which project into the central stomachal cavity, generally function as organs of this kind. In the Alcyonarians the sexual products are formed at the free edge of these processes, either in the stomach or at some distance from it, at the base of the gastric space; two septa are sterile. They are distinguished by the presence of the ridges mentioned above, (§ 93), which project some way forwards. The other ridges do not always carry sexual products, for in many Alcyonarians they are found on four only, or only on two of them. In the Actinias the generative products are formed within the gastric ridges. The same thing happens in the Antipatharia (Gerardia). The Madreporinse, also, may be mentioned here, for in them the generative products are developed in the ridges, which project far into the base of the gastric cavity, and they there form a special process on each of the two surfaces of the ridges (Astroides calycularis). The sexes are usually separated, and in different persons, but there may be hermaphrodites also (Cerianthus). In the colonial forms both dioecious and monoacious conditions have been observed; in others these characters vary very greatly (Corallium rubrum). When the persons of a colony are dimorphic, those which are the more developed are at the same time those which are functionally sexual, while the others are sterile. But in some Peimatulida3 the persons without tentacles are the only ones in which there are generative organs (Virgu- laria mirabilis). § 08. Ha
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