CENTROPAGES. 65 



1. Centropages typicus, Kroyer, PI. VIII, figs. 1 — 10. 



Centropages typicus, Kroyer. Nat. Tidskr. anden. Rsekkc s andet 

 Bind, Side 588, (1849). 

 — — Boeck. Oversigt over de ved Norges Kyster 



iagttagne Copepoder, p. 19, (1864). 

 Ichthyophorba denticornis, Claus. Die frei-lebenden Copepoden, 



p. 199, pi. xxxv, figs. 1, 3—9 (1863). 

 — — Brady. Nat. Hist. Trans. N. &T>., vol. i, 



p. 40, pi. iv, figs. 1—6, (1864). 



Body elongated ; last thoracic segment produced 

 downwards at each side (but more strongly in the 

 female than in the male), into a large and strong spine. 

 Anterior antennae as long as the body (fig. 1), bearing 

 a strong pointed tooth on the outer margins of the 

 first, second, and fifth joints ; right antenna of the male 

 (fig. 2) hinged between the eighteenth and nineteenth 

 joints, and bearing denticulated plates above and below 

 the hinge, much swollen in the niiadle, armed with a 

 strong hook-like spine on the margin of the sixteenth 

 joint. Fifth pair of feet in the female (fig. 9) much 

 like the preceding pairs except that the outer branch 

 has the middle joint produced internally into a very 

 long and strong spine ; in the male (fig. 10) the inner 

 branch is on both sides adapted for swimming, but 

 the outer branch of the right limb has the last two 

 joints developed into a powerful grasping organ by 

 the conversion of each joint into a curved claw, that 

 of the middle joint being stout, crooked, and denti- 

 culated at the extremity ; the outer branch of the left 



