2252 CRUSTACEA. 



of New Zealand, April 9, 1840 ; also, April 14, off Sunday Island, in 

 the same region. 



Length, one-sixteenth of an inch. Colour of head, very deep blue 

 (nearly black) ; of the rest of the body, bright grass-green in one speci- 

 men, excepting yellowish along the venter ; in another, bluish, with 

 the intestine deep red; stylets, sienna-yellow. One blue specimen 

 had an egg attached, showing it to be a female. The two anterior 

 antennae extend obliquely forward, making an acute angle with one 

 another. These organs are very slender, and have a few short hairs 

 at apex of first and second joints, and a long setiform appendage at 

 apex of third joint, which is the longest joint of the organ. This joint 

 evidently corresponds normally to the fourth in the preceding species, 

 and is the third, because the normal first was obsolete. The last two 

 joints are subequal. Two very short hairs from under margin of last 

 joint near apex. The characters here specified are entirely those of 



the Setellae. 



The first pair of legs is very slender, and has three very short 

 moveable setae at apex, which are not longer than the third (or last) 

 joint. First pair of natatories much smaller than the following three, 

 and, as in the preceding species, one branch is two-jointed, while the 

 other is three-jointed. Two caudal setae are very long and scabrous; 

 the others are minute. 



Tribe II. DAPHNIOIDEA. 



The Daphnioidea are distinguished by having a large carapax 

 covering the whole body exclusive of the head, and not closing com- 

 pletely below, and by the posterior antennae being exsert; also, by 

 having four to six pairs of foliaceous or subnatatory appendages, cor- 

 responding to the natatory legs of the Cyclopoidea, although of diffe- 

 rent form. The abdomen is usually incurved, and is acutely furcate 

 at extremity. The superior antennae consist of but one or two joints, 



