

CYCLOPOIDEA. 1225 



There are four pairs of natatories, and the fourth pair is very short. 

 Both branches are three-jointed. 



In latitude 17i° north, longitude 20*° west, October 2,1838, a speci- 

 men was obtained having nearly the above characters. It was the 

 first seen of the genus. The only points of difference which the draw- 

 ings seem to indicate, are a much stouter cephalothorax in a dorsal 

 view, and the anterior antennae but five-jointed. Length, about one- 

 thirtieth of an inch. Colourless, or slightly greenish. The abdomen 

 has the same form as in the above, and two similar though smaller 

 appendages. 



CORTC^lUS CONCINNUS. 



C. pellucido similis. Ceplialothorax pernio crassior ; abdomen graciMus; 

 styli breviores, dimidium abdominis longitudine non superantes. An- 

 tennas anticaz^-articulatas. 



Similar to G. pellucidus. Cephalothorax a little stouter; abdomen 

 more slender ; caudal stylets shorter, not half as long as the abdo- 

 men. Anterior antennae three-jointed. 



Plate 86, fig. 7 a, lateral view, natural size ; a/, dorsal view of 

 cephalothorax, imperfect ; b, posterior antenna. 



Pacific Ocean, latitude 15° 35' south, longitude 138° 30' west, 

 August 19, 1839; also, about two hundred and fifty miles south of 

 Tongatabu. 



Length, one-twenty-fourth of an inch. Colourless, with a blue tinge 

 along the venter. 



This species resembles the preceding ; but has a more slender abdo- 

 men and shorter stylets in proportion. The upper and under sides of 

 the abdomen in a profile view are parallel. There are appendages to 

 the posterior part above as in the preceding. The anterior antennae 

 appeared to be quite short and to have only three joints. The apex 

 of the second joint of the posterior antennae is truncate and bears a 

 minute spine, rendering it acute. 



307 



■ 



