Metacestodes of trypanorhynch cestodes from teleost fishes. 2. Viable plerocerci of Callitetrarhynchus gracilis in the body cavity of Scomberomorus commerson. 3. Melanised trypanorhynch plerocerci in the body cavity of Epinephelus sp. 4. Melanised and contracted cysts of trypanorhynch metacestodes in the body cavity of Cephalopholis miniata; no viable plerocerci were recovered from these cysts. 5. Plerocerci of Pseudogilquinia spp. (arrows) around the oesophagus of Lethrinus nebulosus. 6. Merocerci of Molicola horridus in the liver of Diodon hystrix. 7. Plerocerci of Grillotiella exile in the gill arches of Scomberomorus commerson (histological section).