96 Transactions. — Zoology. 



Genus Cyclops, Mutter. 

 Anterior antennae forming hinged clasping organs in the male. Pos- 

 terior antennae 4-jointed, without a secondary branch. Mandible dilated 

 and toothed at the extremity, palp minute bearing two long setae. Maxilla? 

 strongly toothed. Swimming-feet with both branches 3-jointed.* 

 a. — Anterior antenna 17 -jointed. 



1. Cyclops gigas, Claus. PI. IX., figs. 8-10. 



C. gigas, Claus. Die freilebenden Copepoden (1863), p. 100. 

 Anterior antenna? reaching to third segment of the body, tapering in 

 width somewhat uniformly, relative length of joints as follows : — 



1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 

 16. 15. 3. 8. 5. 3. 6. 3. 3. 3. 4. 4. 3. 4. 5. 8. S. ' 



last joint terminated by about six setae. Posterior antennae strongly 

 developed. Mandibles strongly toothed. Setae of the swimming feet 

 densely plumose ; spines pectinately toothed. Fifth foot 2-jointed ; basal 

 joint broad, bearing a single long seta at the outer angle ; second joint 

 longer, narrow, with a long and a short seta. Abdominal segments 

 pectinately toothed on their posterior margins. Caudal segments about 

 8 times as long as broad, slightly exceeding in length the three preceding 

 abdominal segments. Central caudal setae longer than abdomen ; outer 

 three-fourths the length of central ; inner very short. Length -^ inch. 



Hab. Tomahawk Lagoon, near Dunedin. 



Our form agrees in all respects with the European species, and the 

 description is almost a reproduction of that in Brady's Monograph, vol i., 

 p. 105. 



/3. — Anterior antenna 1^-jointed. 



2. Cyclops nova-zealandia, G.'M. Thomson. (Trans. N.Z. Inst., vol. xi., 



p. 258.) 

 Numerous specimens (all males) were sent to me from Canterbury by 

 Mr. Charles Chilton. 



y. — Anterior antenna 12-jointed. 



3. Cyclops serrulatus, Fischer. PI. XL, figs. 19-22. 

 Cephalothorax oval, not greatly exceeding in length the rather slender 



abdomen. Anterior antennae reaching to the middle of third body segment, 

 tapering gradually to the extremity ; the relative lengths of the joints being 

 about as follows : — 



1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 

 20. 7. 5. 12. 8. 5. 10. 16. 13. 17. 23. 22 

 Fifth pair of feet very small, 1-jointed, subtriangular, dilated outwards, 

 bearing 2 setae and a ciliated lancet-shaped spine. Caudal segments much 



* See " Trans. N.Z. Inst.," vol. xi., p. 258, 



