On some remarkable new Forms of Caryophyl-laeidae from the Anglo-Egyptian Sudan, and a Revision of the Families of the Cestodaria

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Abstract
Four remarkable new species of Caryophyllaeidae from the Anglo-Egyptian Sudan are described, three of which (from Siluroid fishes) are referred to a new genus, Wenyonia —W. virilis, W. acuminata, and W. minuta—and the fourth (from M o r m y r u s c a s c h i v e) to the original genus Caryophyllaeus—C, filiformis. The chief characteristics of the new genus are the situation of the sexual apertures in the anterior half of the body, and the elongated uterus. The family Caryophyllaeidae, after deletion of the genera Diporus, Monobothrium, and Glaridacris, thus contains three genera—Caryophyllaeus, Archigetes, and W e n y o n i a—all of which are re-defined, with their known species. Very young immature forms of Wenyonia occur in the same (Siluroid) host as the adult and are devoid of a ‘caudal ‘appendage, whence it would appear that the life-history of these new forms is different from that of C. laticeps. The three families of the Cestodaria—Caryophyllaeidae, Gyrocotylidae, and Amphilinidae—are re-defined. The Cestodaria, after eliminating Bangui ni cola (a Trematode ?), are provisionally grouped into two Orders : the Amphilinidea (with one family, the Amphilinidae) and the Paralinidea (with two families, the Caryophyllaeidae and the Gyrocotylidae), the latter being closely allied to the Bothriocephalidae. These two Orders are defined.

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