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Show 1899.] PARASITIC COPEPODA O N PISHES. 469 Anthosoma smithii Baird, Brit. Entom. 1850, p. 299, pl. xxxiii. fig. 9. ,. „ Leach, Enc Brit. Suppl. 1816, p. 406, pl. xx. fig. 1. „ Kroyer, Tidsskrift, ii. 1838, p. 295, pl. ii. fig. 2. „ M.-E. Hist. Nat. Crust, iii. 1840, p. 483, pl. xxxix. fig. 5. „ crassus, Stp. & Liitk. Bidrag til Kundskab, 1861, p. 397, pl. xxii. fig. 24. In Coll. Brit. Mus. Host: Lamna comubica. Pacific and Atlantic, &c G. 2. TUCCA Nordm. Head small, rounded, with a lamellar appendage on either side ; neck distinct. No dorsal plates on thoracic limbs. Genital segment large, oval. Abdomen small, biarticulate. Anterior antennae many-jointed, setaceous. Posterior antennae small, unciform. (1) TUCCA IMPRESSA. 2 • Tucca impressa Nordm. Bull. Soc. Imp. Moscou, vol. xxxvii. pl. vi. fig. 7 (1864). Kr. Tidsskrift, i. 1837, p. 182. M.-E. Hist. Nat. Crust, iii. 1840, p. 496. Host: Dioclon hystrix. Atlantic. G. 3. NORION Nordm. Head rounded, small; neck distinct. No dorsal thoracic plates, limbs converted into a divided ventral plate with wing-like expansions anteriorly. (1) NORION EXPANSUS. 2 • Norion expansus Nordm. Bull. Soc. Imp. Moscou, vol. xxxvii. pl. ii. (1864). Host:-? G. 4. EPACHTHES Nordm. Cephalothorax as in Lernanthropus, the first pair of thoracic limbs being short, single-branched with three joints, the last three changed into lamellar plates. (1) EPACHTHES PARADOXUS. 2« Epachthes paradoxus Nordm. Mikrogr. Beitrage, 1832, p. 45, pl. xii. fig. 2. Lernanthropus paradoxus M.-E. Hist. Nat.Crust, iii. 1840, p. 499. Host: Mugil sp. Cape of Good Hope. G. 5. LERNANTHROPUS Nordm. Head oblong or pyriform, sides incurved ; neck distinct. Thorax two-jointed, produced posteriorly in a lobe or a pair of lobes more PROC. ZOOL. Soc-1899, No. X X X I . 31 |