210 BRITISH ENTOMOSTRACA. 
3. Canthocamptus furcatus. Tab. XXV, figs. 1, 2 ; 
Tab. XXX, figs. 4, 5,6. 
Cyclops furcatus, Baird, Mag. Zool. and Bot.,i, 330, t. 9, f. 26-28, 
1837. 
Cyclopsina furcatus, M. Edwards , Hist. Nat. Crust., iii, 429. 
Cantho carpus furcatus, Baird, Trans. Berw. Nat. Club, ii, 154, 1845. 
Nauplius furcatus, Philippi, Wiegm. and Erichs. Arcliiv, 1843, p. 69. 
The thorax and abdomen are more distinctly separate 
from each other than the two preceding species, especially 
when viewed in a prone position. They are composed of 
ten segments, the first being the largest ; the last termi- 
nating in two short lobes, from which issue two long 
setae, more than half the length of the body, and two 
others, about half the length of the former. The first 
segment, with which the head is consolidated, is furnished 
with a short beak. The eye is of a bright ruby colour. 
The antennae consist of seven or eight articulations, and 
at the fourth joint are very distinctly forked. The upper 
division is not articulated, and is longer than the lower 
limb, which is divided into three or four joints, each of 
which throws upwards and forwards a tuft of short setae. 
The antennules are formed of two articulations, the latter 
terminating in three or four rather long setae. The man- 
dibles were not seen. The posterior foot-jaws consist of 
two segments, the latter terminating in a curved hook, 
pointing upwards, as in C. minutus. 
The first pair of feet (f. 2 a) has the superior or ex- 
ternal stalk the longer of the two. It is composed of two 
joints, the first of which is short, and the second longer, 
having a strong tooth or process on its inferior edge, and 
terminating in three or four short, curved setae or hooks. 
The inferior or internal stalk has three articulations ; the 
first short and thick, the second longer and broad, and 
the third short and terminated by two tolerably long and 
straight setae and five or six curved ones, each gradually be- 
coming shorter than the others. The three succeeding pairs 
of legs resemble those of the two preceding species. The 
fifth pair (t. XXX, f. 5 b) has an appendage in the form of 
