CYCLOPOIDEA. ]J27 



two short branches. The branches are one- or two-jointed, and long 

 setigerous (figs. 60, 61, Plate 71). 



Maxillce. — The maxillae are more or less lamellar. There is an 

 irregular basal joint, bearing stout setulose setae on the interior side, 

 and also longer setae on the opposite side. This basal portion bears a 

 lamellar palpus, consisting of an oblong joint, broad at base, but ab- 

 ruptly narrowed near middle, where there is a one-jointed lateral 

 branch, besides often having a single articulation near the extremity. 

 The palpus has long setae at apex. 



Maxillipeds. — The maxillipeds consist of three very stout joints, 

 forming a line at right angles with the body, slightly flexed, and 

 admitting of motion only in the direction of the body. They are 

 crowdedly furnished on the anterior side with a number of stout and 

 long spinulous setae, those of the third joint being the longest. They 

 extend forward to the mouth or a little beyond it, and constitute a 

 kind of scoop-net for collecting the food of the animal (fig. 77, Plate 

 71, and Plates 79, 80, 81). 



First pair of legs. — These organs, so largely developed in the Calani, 

 are here smaller than the maxillipeds. They have commonly two 

 rather stout joints, bearing a few unequal spinulous setae, resembling 

 the setae of the maxillipeds. Besides these, there is a second branch, 

 which is slender, and consists of three to five naked joints. This 

 branch is large in the Calani, and constitutes the organ, the other 

 being obsolete. It appears to be the outer branch, while the other is 

 the inner. 



In the Calanoid Pontellae, the maxillipeds are but little larger than 

 the first pair of legs. 



Natatory legs. — These are two-branched, from a stout base ; the 

 longer branch is two- or three-jointed, usually three in adults; and 

 the shorter is one- to three-jointed (Plate 82, fig. 6 d, e). They are 

 furnished with setae at the extremity and on the inner side, while at 

 the apex of each joint there are one or two short spines, besides one 

 or two others on the outer side of the last joint. 



The four pairs of natatories are similar in characters. The first is 

 usually the shortest, and the second and third the longest. 



