An emended generic diagnosis for Cycloplectanum Oliver, 1968 (Monogenea: Diplectanidae) is provided which emphasizes the importance of the terminal genitalia (penis and vagina) in generic separation. Cycloplectanum americanum (Price, 1937) Oliver, 1968 is recognized as type species of Cycloplectanum. Cycloplectanum epinepheli (Yamaguti, 1938) n.comb., C. serrani (Yamaguti, 1953) n.comb., C. amplidiscatum (Bravo-Hollis, 1955) n.comb., C. latesi (Tripathi, 1955) n.comb., C. melanesiensis (Laird, 1958) n.comb., C. querni (Yamaguti, 1968) n.comb., C. cupatum (Young, 1969) n.comb., C. summanae (Young, 1969) n.comb., C. vagampullum (Young, 1969) n.comb., together with C. hongkongensis n.sp., C. lantauensis n.sp., and C. yamagutii nom.nov., are included in the genus. Cycloplectanum yamagutii nom.nov. is proposed for Pseudorhabdosynochus epinepheli which was named a synonym of C. americanum by G. Oliver in 1968.Based on material from Epinephelus spp. (Serranidae) taken in the South China Sea, redescriptions are presented for C. cupatum and C. vagampullum. In addition, C. hongkongensis n.sp. from E. brunneus and E. awoara and C. lantauensis n.sp. from E. brunneus and E. fario are proposed. The findings of C. cupatum and C. vagampullum on E. fario represent new host and geographic records.

IntroductionFour species of Capillaria were found in eight species of wild carnivorous mammals (286 carcasses) taken in Ontario, Canada. C. plica was found in the urinary bladder of raccoon (Procyon lotor), red fox (Vuipes vulpes), coyote (Canis latrans), fisher (Martes pennanti) and striped skunk (Mephitis mephitis); C. putorii in the stomach and intestine of short-tailed weasel (Mustela erminea), mink (M. vison), fisher, marten (Mattes americana), striped skunk and raccoon; C. aerophila in the mucosa of the trachea and bronchi of red fox and marten and C. procyonis in the epithelial lining of the oesophagus of raccoon and striped skunk. All four Capillaria spp. are redescribed and specimens of each species from different host species are compared. A key to the identification of the above species as well as C. didelphis and (7. hepatica is presented. Specimens of C. erinacei and additional material of C. putorii were obtained on loan. Specimens named C. mustelorum by previous authors were collected from carnivores in Ontario. C. mustelorum and C. erinacei are considered to be synonyms of C. putorii.The genus Capillaria is briefly reviewed historically and the recognition of other genera, based on single characters, is discussed and rejected.The possibility of accommodating the Capillaria spp. from Canadian carnivorous mammals in the sub-genera Capillaria and Thominx is discussed and dismissed.t Present address: attempted to split the genus Capillaria by placing species in other genera of which the following have been recognized in recent papers;

The Monocotylidae Taschenberg, 1879 is revised based on a cladistic analysis of relationships between the constituent species and genera. The monophyly of the family is supported by three apomorphic character states: division of the haptor into one central and eight peripheral loculi; the ovary looping the right intestinal caecum; and tetrahedral eggs. The family is divided into six subfamilies:

Lesions due to Dracunculus insignis in the legs of raccoons (Procyon lotor) in southern Ontario occur seasonally as most larvigerous females emerge in the spring and early summer (April-June). The pathology of dracunculiasis in the raccoon is described and the transmission of the parasite in the wild is discussed with respect to seasonality and local agricultural practices. Crayfish, fishes and frogs (including tadpoles) were given infective third-stage larvae of D. insignis to test their suitability as paratenic hosts. Most of the larvae fed to adult Rana pipiens and R. clamitans were recovered from the somatic musculature. Larvae had increased in size and were highly infective to raccoons.

Specimens of Gyrodactylus Nordmann, 1832, both newly collected and deposited type material, from cultured and wild salmonid fishes from various localities in North America, are compared and five species are recognized: G. salmonis Yin and Sproston, 1948 status emended, on Salmo clarki, S. salar, S. aguabonita, S. gairdneri, S. trutta, Salvelinus fontinalis, S. namaycush, and Oncorhynchus kisutch from several localities throughout the continent; Gyrodactylus nerkae n. sp. on O. nerka from Vancouver Island; G. colemanensis Mizelle and Kritsky, 1967 on Salmo gairdneri from California, Arkansas, and insular Newfoundland, S. fontinalis from Nova Scotia and Ontario, and S. trutta, S. namaycush, and S. fontinalis × S. namaycush from Ontario; G. avalonia Hanek and Threlfall, 1969 on S. gairdneri from Nova Scotia; and G. brevis Crane and Mizelle, 1967 on S. gairdneri from California. Gyrodactylus salmonis, G. nerkae, and G. colemanensis are considered specific to salmonid fishes, whereas G. avalonia and G. brevis are considered "accidental" infections, acquired from nonsalmonid fishes. A diagnostic key to the five species is provided and gyrodactyliasis, as a disease of cultured salmonids in North America, is discussed briefly.