Page:Transactions NZ Institute Volume 15.djvu/130
Genus Cyclops, Müller.
Anterior antennæ forming hinged clasping organs in the male. Posterior antennæ 4-jointed, without a secondary branch. Mandible dilated and toothed at the extremity, palp minute bearing two long setæ. Maxillæ strongly toothed. Swimming-feet with both branches 3-jointed.[1]
α.—Anterior antennæ 17-jointed.
1. Cyclops gigas, Claus. Pl. IX., figs. 8–10.
C. gigas, Claus. Die freilebenden Copepoden (1863), p. 100.
Anterior antennæ 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. | 8. |
last joint terminated by about six setæ. Posterior antennæ strongly developed. Mandibles strongly toothed. Setæ 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 posteior margins. Caudal segments about 8 times as long as broad, slightly exceeding in length the three preceding abdominal segments. Central caudal setæ longer than abdomen; outer three-fourths the length of central; inner very short. Length 1⁄10 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.
β.—Anterior antennæ 14-jointed.
2. Cyclops novæ-zealandiæ, 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.
γ.—Anterior antennæ 12-jointed.
3. Cyclops serrulatus, Fischer. Pl. XI., figs. 19–22.
Cephalothorax oval, not greatly exceeding in length the rather slender abdomen. Anterior antennæ 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 setæ and a ciliated lancet-shaped spine. Caudal segments much
- ↑ See "Trans. N.Z. Inst.," vol. xi., p. 258.