On Megalocypris princeps. 



The inferior antennæ (fig. 6), originate at rather a long 

 distance from the superior, at the inferior corner of the 

 frontal part of the body. They are rather strongly built, 

 pediform and doubly geniculate, being curved downwards 

 and backwards. Of the two joints composing the basal, 

 part, or scape, the distal one is rather large and extended 

 more or less straight in front, forming with the short and 

 thick proximal joint a slight elbow-shaped bend. Jt only 

 carries a single slender seta, which issues from the end 

 below, and is curved backwards. The terminal part is 

 composed of 3 joints of very unequal size. The proximal 

 joint is about the length of the distal joint of the scape, 

 but somewhat narrower, and is connected with it by an ab- 

 rupt, almost rectangular bend, being extended straight 

 downwards. At the base it carries a slender bristle pro- 

 jecting in front, and behind, at some distance from the 

 base, a small sensory papilla is attached to a separate 

 ledge. A slender recurved seta, moreover, issues from 

 the end of this joint behind, and inside the tip a trans- 

 verse row of 6 very delicate bristles occurs (see fig. 7), 

 answering to the natatory setæ in other Cyprididæ. In the 

 present form, however, these setæ are extremely small and 

 rudimentary, without any ciliation. The 2nd joint, as a 

 rule, forms with the 1st a geniculate bend, being turned 

 more or less beckwards. It is scarcely more than half as long 

 as the 1st, and much narrower, carrying on both edges, about 

 in the middle, 2 or 3 setæ. At the end, it projects below 

 to an obtuse prominence, advancing over the base of the 

 terminal joint, and armed with 4 strong claws minutely 

 denticulate inside. The last joint is very small, and carries 

 a single claw similar to those proceeding from the terminal 



