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Show 482 MR. P. W. BASSETT-SMITH ON [Apr. 18, tinctly segmented. Genital rin<; short. A! domen small, with minute caudal plates. Posterior antennae strongly uncinate. All four pairs of thoracic limbs present, biramose and triarticulate. (1) THERODAMUS SERRANI. 2 • Therodamus serrani Kr. Bidrag til Kundskab, 1863, p. 316, pl. xv. fig. 4. Host: gills of Serranus sp. West Indies. G. 3. PENICULUS Nordm. • Head oval, without horn-like processes. Thorax distinctly segmented, giving rise to four pairs of limbs, the first two pairs being placed close behind the head, the third and fourth some distance removed from them and from each other. Genital segment very long. Abdomen small, with minute caudal plates. Male smaller than female, with a short genital segment. (1) PENICULUS EISTULA. 2 cf • Peniculus fistula Nordm. Mikrog. Beitrage, 1832, p. 107, pl. vi. fig. 8. „ „ M.-E. Hist, Nat. Crust, iii. 1840, p. 497. „ „ Heller, Beise d. Novara, 1865, p. 248, pl. xxv. fig. 3. „ „ Claus, Bech. fiber Lernceocera &c. 1868, p. 12, pis. ii., iii Host : Zeus faber. (2) PENICULUS EURCATUS. 2 • Peniculus furcatus Kr. Bidrag til Kundskab, 1863, p. 268, pl. xii. fig. 4. Claus, op. cit. 1868, p. 12. Host: gills of Holacanthus [Tetrodon] sp. East Indies. (3) PENICULUS CLAYATUS. 2 • Peniculus clavatus Kr. Bidrag til Kundskab, 1S63, p. 266, pl. xiv. fig. 8. Lerncea clavata Mull. Host: fins of Sebastes norvegicus. Greenland. G. 4. PENELLA Oken. (Lernceopinna Blainv.) Head large, globose, tuberculate, with arm-like projections directed backwards ; the neck is long and straight, not distinctly segmented, united with the elongated genital segment in the same line. Abdomen penniform. Four pairs of limbs are present, placed close behind the head and together ; the first two are biramose, the third and fourth uniramose, each branch with two joints. Male minute, not elongated. Young form of female as " Hessella cylindrica " Brady, Chall. Bep. vol. xxiii. p. 190, pl. xxix. figs. 40-42, and Bandits elongatus, |