REPORT ON THE COPEPODA. Ill 



1. CoryccEiis varius, Dana (PI. LII. figs. 1-14). 



Corycccus varius, Dana, Crust. U.S. Expl. Exped. (1852), p. 1211, pi. lxxxv. fig. 4, a-i. 

 „ ' longistylis, Dana, Ibid. p. 1212, pi. lxxxv. fig. 5 a-d. 



,, sti/liferus, Lubbock, On Entomostraca collected by Dr. Sutherland, Trans. Entom. 



Soc, vol. iv., N. S., pi. v. figs. 7, 8 (1856). 

 ,, furcifer, Claus, Die frei lebenden Copepoden (1863), p. 157, pi. xxiv. figs 7-12. 



Length, l-8th of an inch (3 mm.). Body slender and elongated ; third thoracic seg- 

 ment produced into two long and acutely -pointed lateral processes, which extend as far 

 backwards as the middle of the abdomen (figs. 1, a, a, and fig. 3, a); caudal stylets vari- 

 able in length, but in the adult many times longer than broad, and usually about twice 

 as long as the abdomen. Anterior antennae (fig. 6) less than half as long as the first 

 segment of the body, six-jointed, the joints of nearly equal length ; posterior antennae 

 (fig. 7 male, fig. 8 female) much larger, and forming a strongly prehensile limb, basal 

 joint bearing two very long spine-like setae, second joint subquadrate, produced at its 

 inner distal angle into a broad acutely pointed, triangular tooth, third joint small, bearing 

 a few small curved, acuminate setae, and at the apex an extremely long falcate claw, 

 which when flexed on the limb interlocks with the two long setae of the basal joint. In 

 the female the terminal claws are much shorter than in the male, while the triangular 

 tooth of the second joint is larger. Posterior foot-jaw (fig. 11) prehensile, and armed 

 with a long, falciform apical claw, at the base of which are two small flagellate 

 setae (fig. 11, a). Inner branches of the first three pairs of swimming feet (figs. 12, 13) 

 very short. Distal extremities of the caudal stylets slightly dilated (fig. 1, a), and giving 

 attachment to several setae, the innermost being robust and about half the length of the 

 stylet, the second half the length of the first, the third rather longer than the second, but 

 much more slender and flexuose ; there is also a small spine at the outer angle, and a very 

 minute marginal seta a little removed from the apex of the stylet. The eyes are situated 

 quite on the front of the head, quite distinct and remote one from the other towards the 

 side of the body. 



Habitat. — Forms which I refer to Corycceus varius occurred in the surface gatherings 

 from a very large proportion of the places visited by the Challenger. The following list 

 of localities shows the wide distribution of the species : — Off Port JacksOh, Australia ; 

 between Sydney and Wellington ; off Kandavu, Fiji ; between Api and Cape York ; off 

 south of Papua; at many localities amongst the Philippine Islands ; Pacific, north of the 

 Sandwich Islands, in kit. 30° 22' N., long. 154° 56' W. (Station 256); in lat. 36° 32' S., long. 

 132° 52' W. (Station 287) ; lat. 37° 3' S. ; long r 44° \T W. (Station 326) ; lat. 32° 24' S., 

 long. 13° 5' W. (Station 335) ; lat 12° 16' S., long. 13° 44' W. (Station 341) ; lat. 9° 43' 

 S.,,.long. 13° 51' W. .(Station 342); lat. 3° 10' N., long. 14° 51' W. (Station 348) ; in 

 various localities between lat. 5° 28' N., long. 14° 38' W. ; and lat. 10° 55' N., long. 17° 



