20 BRITISH COPEPODA. 
Posterior antennz 2-jointed, with a minute 1-jointed 
inner branch. Mandible-palp short (fig. 6), consisting 
of a basal portion and two short 1-jointed branches. 
Maxilla armed with several curved teeth (fig. 7), and 
having a small bilobed setose palp. First pair of foot- 
jaws (fig. 8) divided into several setose segments ; 
second pair elongated (fig. 9), 3-jomted, forming a 
grasping hand, which terminates in a curved claw. 
First four pairs of feet (fig. 10) nearly alike; both 
branches 3-jointed. Hach foot of the fifth pair con- 
sists of a single broad fringed plate, larger in the 
female than in the male. Ovisac single. 
1. Tacuripius BREvicorNIs (Muller). Pl. XX XVII. 
Cyclops brevicornis, Miller. Zool. Dan. Prodr., 2414 (1776). Ento- 
mostraca, p. 118 (1785). 
— — Fabricius. Faun. Groen., 240 (1780). 
Tachidius = — Lilljjeborg. De Crustaceis ex ord. trib., 
p. 196, tab. xxii, figs. 12—16; tab. xxiii, 
figs. 1, 2,9; and tab. xxiv, figs. 17, 18 (1853). 
— — Brady. Nat. Hist.Trans. Northumberland and 
Durham, v. iu, p. 130, pl. v, figs. 1—9 (1868). 
— — Boeck. Oversigt Norg. Copepoder, p.33 (1864). 
Body robust, produced into a short, blunt rostrum; 
body-segments fringed on their posterior margins with 
rows of minute teeth; last three abdominal segments 
about equal in length, those of the tail (fig. 16) rather 
longer than broad. Anterior antenne of the female (fig. 
4) 7-jointed ; first two joints large, third, fourth, and 
fifth short and nearly equal, sixth nearly as long as the 
two preceding, seventh very small, the whole limb beset 
