NO. 5.] ACCOUNT OF THE SPECIES. 71 



The tail almost attains half the length of the anterior division, and is 

 divided into 4 well-defined segments. The 1st, or genital segment, as usual, 

 is much the largest, though scarcely attaining the length of the 2 succeeding 

 ones combined. It is slightly dilated in front of the middle, and forms below 

 at its anterior extremity a rather conspicuous rounded protuberance. The 

 last, or anal segment is scarcely more than half as large as the preceding 

 one, and is almost transversely truncated at the end. The caudal rami (see fig. 

 12) are narrower and more elongated than in the type species, being about 

 3 times as long as they are broad. They are scarcely at all divergent, though 

 separated by a rather broad interspace, and they have the tip obtusely trun- 

 cated, with a small projecting corner outside the caudal setae. The latter, on 

 each ramus, are 4 in number, all apical and of moderate length, the innermost 

 but one being, as usual, the longest. 



The anterior antennae (fig. 3) are rather slender, and, when reflexed, extend 

 about to the middle of the tail. They are each composed of only 23 articu- 

 lations, the rather elongated 7th articulation apparently representing 3 united 

 joints. The antennae carry in front comparatively short and delicate bristles. 



The posterior antennae (fig. 4) have the outer ramus considerably longer 

 than the inner, and 6-articulate, all the joints being setiferous. 



The mandibles (fig. 5) are moderately strong, with the masticatory part 

 rather expanded, and the cutting teeth well developed, though rather short. 

 The palp is fully as long as the body of the mandible, and has the basal 

 part obliquely produced at the inner corner, so that the inner ramus projects 

 considerably beyond the outer. 



The maxillae (fig. 6) are of quite normal structure, resembling those in 

 the type species. 



The anterior maxillipeds (fig. 7) have the 5 digitiform lobes less densely 

 crowded together than in the Calanoids described in the preceding pages, and 

 the setae issuing from them are rather strong and coarsely ciliated, none of 

 them, however, assuming a spiniform character. The apical setae issuing 

 from the 3 very small distal joints, are well developed, resembling those of 

 the digitiform lobes. 



The posterior maxillipeds (fig. 8) are moderately slender, about twice as 

 long as the anterior, and have the 2 basal joints of about equal length. The 

 terminal part is a little shorter and not reflexed. 



