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Show 1899.] PARASITIC COPEPODA ON FISHES. 489 (1) SPHYRION LCEVIGATUM. 2 • Sphyrion Icevigatus Cuv. Begne Anim., Zooph. 1830, pl. xxxii. fig. 4. Chondracanthus levis Quoy & Gai., Freycinet Beise Zool. 1824, p. 541, pl. lxxxvi. fig. 10. „ „ Guerin, Iconogr. Zooph. pl. ix. fig. 4. „ „ Stp. Overs. Vidensk. Selsk. Kjobenh. 1869, p. 187. Lesteira krdgeri Thomson, Trans. N.Z. Inst. vol. xxii. 1889, p. 370, pl. xxviii. fig. 4. In Coll. Brit. Mus. Hosts: Gadus sp., Cape of Good Hope (Q. & G.); Genypterus blacodes, N.Z. (Thorns.). (2) SPHYRION LUMPI. 2 • Lestes lumpi Kr. Danmk. Fiske, ii. 1845, p. 217. Lesteira lumpi Kr. Bidrag til Kundskab, 1863, p. 325, pl. xviii. fig. 5. „ „ Stp. Overs. Vidensk. Selsk. Kjobenh. 1869, p. 182, pl. ii. fig. 5. In Coll. Brit. Mus. Host: Cgclopterus lumpus. Denmark ; ? Dungeness. G. 2. MEDESICASTE Kroyer. Head minute, rounded, with both pairs of antennas, and two pairs of minute uncinate maxillipeds and mouth in front. Thoracic portion very elongated, divided into two parts, the anterior being the broader, having at its base two wing-like processes, the posterior portion cylindrical. Genital segment as broad as long, robust, deeply emarginate in front and behind. Abdomen small, biarticulate. Egg-sacs long, club-shaped. One pair (?) of bilobed thoracic limbs placed close behind the head. Male pigmy, like those of Chondracanthus. 1. MEDESICASTE TRIGLARUM. 2 • Medesicaste triglarum Kr. Bidrag til Kundskab, 1863, p. 312, pl. xviii. fig. 1. Host : Trigla hirundo. Kattegat. 2. MEDESICASTE PENETRANS. 2 • Medesicaste. penetrans Heller, Beise d. Novara, 1865, p. 235, pl. xxv. fig. 1. Host: Trigla capensis. Cape of Good Hope. G. 3. ORALIEN, gen. nov. Head rounded in front, carrying there the two pairs of antennas, and lateral lobe-like projections ; produced posteriorly as a cylindrical neck more or less long, at the juncture of which with |