172 BRITISH COPEPODA. 
show a condition intermediate between the flattened 
Peltidian group, on the one hand, and the typical 
Harpacticids, such as Thalestris and Dactylopus, on 
the other. 
As regards the generic term [dya, I think Boeck is 
doubtless right in identifying Philippi’s genus with 
Lilljjeborg’s Tisbe, and as the former has the claim of 
priority it becomes necessary to discard the latter and 
better-known name. 
1. Ipya Furcata (Baird). Pl. LXVII, figs. 1—11. 
Cyclops furcatus, Baird. Mag. Zool. and Bot., i, p. 380, t. ix, figs. 
26—28 (1837). 
Cyclopsina furcatus, Milne Edwards. Hist. Nat. Crust., ui, p. 429 
(1834). 
Canthocamptus furcatus, Baird. Brit. Entom., p. 210, tab. xxv, 
figs. 1,2; tab. xxx, figs. 4, 5, 6 (1850). 
Nauplius furcatus, Philippi. Weigmann’s Archiv, p. 69 (jide 
Baird and Claus) (1843). 
Tisbe furcata, Lilljeborg. De Crustaceis ex ordinibus tribus, 
tab. xxv, figs. 1—5, 11, 12, 17 (1853). 
— — Claus, Die frei-lebenden Copepoden, p. 115, taf. xv, 
figs. 1—10 (1863). Die Copepoden-fauna von 
Nizza, p. 21, taf. iv, figs. 16, 17 (1866). 
Tisbe ensifera, Fischer. Abhandl. der Konig. Bayer Akad., B. viii, 
p. 668, t. iii, figs. 67—70 (1860). 
Idya furcata, Boeck. Oversigt Norges Copepoder, p. 54 (1864). 
— barbigera? Philippi. Weigmann’s Archiv (1843). 
Body elongated, pyriform ; anterior antenne (fig. 2) 
slender, 8-jointed, first four joints (peduncle) consider- 
ably stouter than the rest; the comparative length of 
the joints, though variable, may be stated as follows: 
1. COB Beth Aeol gs Tpeeb Ue 8) 
10 See 1d: 74138 3 3 2 8 
