TETEARHYNOHID^. 141 



fishes, and the embryos are liberated within the stomachs of these 

 new hosts after the manner commonly occurring in the tapeworms, 

 properly so called. How far the embryos (proscolices) differ from 

 those of the Tseniadse, and what changes they undergo during their 

 conversion into the scolex state, are points which do not yet 

 appear to be entirely made out. In their general structure the 

 hermaphroditic proglottides closely resemble the joints (or deutero- 

 zooids) of ordinary tapeworms. 



Genera. — Tetrarhynchus, Eudolphi; = (in part) Bothriocephalus, 

 Leuckart ; = Dibothriorhynchus, Diesing and Blainville ; = Hejp- 

 toxylon, Bosc ; = GymnorhyncJms, Eudolphi ; = (in part) Anthoce- 

 phalus, Bremser and Eudolphi ; = Floriceps, Cuvier ; == Acanthor- 

 hynchus, Diesing ; = Bothriorhynchus, Van Lidth de Jeude ; = 

 Scolex, Ouvier ; Pterohothrium, Diesing ; Bhynchobothrium, Eudol- 

 phi; Tetrarhynchobothrium, Diesing; = TetrabothriorJiynchiis, 

 Diesing ; Synbothrium, Diesing : = Gorynesoma, Leuckart ; Steno- 

 bothrium, Diesing; = Tentacularia, Bosc. 



