116 THE VOYAGE OF H.M.S. CHALLENGES. 



6. Corycceus obtusus, Dana (PL XLVI. figs. 7-9). 



Corycceus obtusus, Dana. Crust. U. S. Expl. Exped. (1852), p. 1214, pi. lxxxv. fig. 6. 

 ? „ anglicus, Lubbock, Ann. and Mag. Nat. Hist., vol. xx. (1857), pi. xi. figs. 14-17; 

 Brady, Monog. Brit. Copep., vol. iii. p. 34 pi. lxxxi. figs. 16-19, pi. lxxxiii. 

 figs. 11-15, pi. lxxxiv. figs. 10-14. 



Length, l-29th of an inch ('87 mm.). Animal rather robust, broadly rounded in 

 front; posterior thoracic spines rather short and stout, about one-third the length of the 

 first abdominal segment, which is at least twice as long as the second, and bears at the 

 antero-ventral angle a small projecting spine; caudal stylets as long as the preceding 

 segment, and not divergent ; setae about half as long as the abdomen. Anterior antennae 

 clothed with setae, none of which are much more than half the length of the limb. 

 Lenses large, situated near the sides of the head. The colour of the animal is a 

 beautiful sea-green, the ocular stylets a much deeper shade of the same. 



A few specimens of this extremely pretty little species were taken in the Inland Sea of 

 Japan. Having been mounted on the spot, the colour of some of them was beautifully 

 preserved. It is the only species, excepting Corycceus anglicus, in which I have seen 

 the peculiar little spine of the first abdominal segment, and this character, together 

 with the small size, seems to identify it unmistakably with Corycceus obtusus, Dana, 

 the types of which, however, were found in the Pacific Ocean near El Gran Cocal, 5-g- 

 degrees south of the equator. A single specimen was noticed also in a mounting of 

 specimens from lat. 36° 44/ $., long. 46° 16' W. (Station 325). I am unable to detect 

 any material difference between this species and Corycceus anglicus, Lubbock. 



Co-pil'm, Dana. 



Copilia, Dana, Proc. Amer. Acad. Sci., 1849. 



Body somewhat depressed, broadly quadrate in front, and bearing at each angle a 

 prominent simple corneal lens (anterior eye) ; abdomen much attenuated, five-jointed. 

 Anterior antennae (PL LIII. fig. 3) short, six-jointed (1); posterior very large, strongly 

 prehensile, and terminating in a long, curved claw. Mandibles (fig. G) short, truncated, 

 destitute of a palp, the broad distal extremity finely denticulated and produced at the inner 

 aspect into a slender falciform process ; maxillae (1 fig. 7) slender, deeply divided at the 

 apex into three digitiform segments; anterior and posterior foot-jaws (figs. 8, 9) very small, 

 simple, and terminating in slender prehensile claws. Four pairs of swimming feet, having 

 both branches three-jointed, except the fourth, where the inner branch consists of only one 

 joint. Fifth pair one-jointed, rudimentary. Pigment bodies of the posterior eyes distant, 

 and bent into an angular form. 



