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. 

 Ctclopsina furcatus, M. Edwards, Hist. Nat. Crust., iii, 429. 

 Canthocarpus furcatus, Baird, Trans. Berw. Nat. Club, ii, 154, 1845. 

 Nauplius furcatus, Philippi, Wiegm. and Erichs. Archiv, 1843, p. 69. 



The thorax and abdomen are niore 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, abont 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 antenuce 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 u])wards, 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 



