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Show *• 462 MR. P. W. BASSETT-SMITH ON [Apr. 18, (2) TREBIUS TENUIFURCATUS. $ . Trebius tenuifurcatus Bath. Proc U.S. Nat. Hist. Mus. 1887, x. p. 559. Host: Trygon sp. Atlantic. G. 16. ELYTROPHORA Gerst. Carapace rounded. Frontal plates distinct. Anterior antennae two-jointed. Fourth thoracic segment with two dorsal plates. Genital segment large, lobed posteriorly. Caudal plates large. All four pairs of thoracic limbs biramose, the branches of the first biarticulate, of the second and third triarticulate, the fourth having the outer branch with three joints, the inner with two. (1) ELYTROPHORA BRACHYPTERA. 2 cf. Elytrophora brachyptera Gerst. Arch. f. Naturg. 1853, xix. p. 60, pl. iii. fig. 12. „ „ Heller, Beise d. Novara, 1865, p. 189, pl. xvii. fig. 1. „ „ B.-S. Ann. & Mag. N. H. ser. 6, xviii. 1896, p. 12, pl. iv. fig. 3. Dinematura thynni Kollar. Arneus thynni Kr. Bidrag til Kundskab, 1863, p. 157, pl. viii. fig. 5. Caligeria bella ? Dana, Proc. Amer. Acad. Arts & Sc. 1848, p. 57. In Coll. Brit. Mus. Host: gills of Thynnus spp. European waters. G. 17. ALEBION Kr. Carapace large, oval. Frontal plates well marked. Anterior antennae two-jointed. Fourth thoracic segment with small dorsal plates. Genital segment broad, prolonged backwards in two elongated processes with the ends and outer margins dentate. Abdomen biarticulate. Caudal plates with long setae. The first three pairs of thoracic limbs biramose, with lunate corneous bodies on outer brauches ; fourth pair of limbs quite rudimentary, hidden. (1) ALEBION CARCHARIJE. 2 cf • Alebion carcharice Kr. Bidrag til Kundskab, 1863, p. 165, pl. xii. fig. 1. „ „ B.-S. Ann. & Mag. N. H. ser. 7, vol. ii. 1898, p. 367, pl. xii. fig. 1. Host: Shark ? Atlantic and Indian Oceans. (2) ALEBION DIFFICILE. 2 • Caligeria dijficilis V. Ben. Bull. Acad. Boy. Belg. xxiv. 1892, p. 258, pl. iv. Host:-? Azores. |
