G. M. Thomson. — On the New Zealand Copepoda. 99 



as long, remainder short ; all more or less setose. Posterior antennae 

 about two-thirds as long as the anterior, slender, 3-jointed, terminating in 

 long claw, somewhat like an elongated fourth joint ; set® few. Mandible 

 tout, strongly toothed; palp 2-jointed, with two setae at the articulation of 

 the second joint, and three at its extremity. Maxillae (?) not satisfactorily 

 made out. First pair of foot-jaws 3-jointed, rather stout, last joint 

 2- branched, each branch furnished with several setae. Second foot-jaws 

 very long, terminating in a powerful chelate hand, which is directed for- 

 ward ; this hand is articulated almost at right-angles with the previous 

 joint, and is furnished at its lower proximal end with 5 comb-like teeth ; 

 palm minutely serrated ; claw as long as the hand, strongly curved. First 

 pair of thoracic feet shorter than succeeding pairs ; branches 1-jointed, 

 furnished with setae of nearly equal length with themselves ; three succeed- 

 ing pairs long and slender, branches 3-jointed, ciliated on their anterior 

 margins, furnished posteriorly with long somewhat plumose setae ; last 

 pair with the inner branch considerably distended. Fifth pair (?) 1-jointed, 

 conical, terminating in a single seta. Length, Jg- inch. 



Colour — pale brown ; integument closely punctated, particularly on the 

 cephalic and dorsal portions. 



Hab. Numerous specimens were obtained by the dredge in Otago 

 'Harbour in about 5 fathoms. 



This species cannot be mistaken for any other hitherto described ; it is 

 nearest A. spherica, Claus, but is sufficiently distinguished by the remark- 

 able form of its abdominal segments, by the 6-jointed anterior antennae, and 

 by the form of the chelate hand of the second pair of foot-jaws. 

 Sub-family Canthocamptine^e, Brady. 

 Genus Diarthrodes, n. gen. 



Anterior antennae 9-jointed ; secondary branch of the posterior antennae 

 1-jointed. Mandible-palp simple 2-jointed. Second foot-jaw forming a 

 prehensile clawed hand. Outer branch of the first foot very short, 2-jointed ; 

 inner branch 3-jointed, the first joint greatly elongated, second and third 

 very short ; second, third, and fourth pairs of feet with both branches 

 3-jointed ; fifth pair 2-jointed. 



1. Diarthrodes nova-zealandia, n. sp. PI. VIII., figs. 15-22. 



Body somewhat tumid ; abdomen much narrower than cephalothorax. 

 Anterior antennae tapering, rather densely setose, the relative lengths of the 

 joints being as follows : — 



1, 2, 3, 4, 5, 6, 7, 8, 9. 

 16. 16. 12. 10. 5. 6. 6. 7. 4. 



Posterior antennae 2-jointed ; last joint bearing five terminal and two 

 small lateral setae ; basal joint with a small 1-jointed appendage bearing 



