44 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



The superior antennae (fig. 4) are comparatively somewhat shorter than 

 in the female, scarcely exceeding in length the anterior division of the body; 

 and they are composed of .only 20 articulations. The two antennae are exactly 

 alike, both having the proximal half clothed in front with strongly developed 

 sensory appendages, in addition to the bristles. Some of the joints of this 

 part, moreover, have assumed a lamellar appearance, especially the third one ; 

 and the 8th joint is still more elongated than in the female, and is apparently 

 constituted of 3 coalesced joints. The distal half of the antennae is very nar- 

 row and, as a rule, forms with the proximal half a slight, angular curve. 



The posterior antennae are of the same structure as in the female, but 

 are comparatively more powerfully developed. 



The oral parts, on the other hand, are rather unlike those in the female, 

 being in some respects much reduced. 



The mandibles (fig. 5) have the masticatory part very poorly developed, 

 whereas the body itself is comparatively larger and broader than in the female. 

 This is also the case with the palp, which is much more robust than in the 

 female, with the basal part very broad and muscular. 



The maxillae (fig. 6), though exhibiting a structure similar to that in the 

 female, are rather smaller, and have both the masticatory lobe and the 

 vibratory plate less fully developed. 



The anterior maxillipeds (fig. 7) are extremely small and rudimentary, 

 only with great difficulty permitting of any close examination. 



The posterior maxillipeds (fig. 8) are likewise much feebler in structure 

 than in the female, and have some of the outer setae recurved and densely 

 plumous. 



The natatory legs (figs. 9, 10), on the other hand, agree exactly, both in 

 size and structure, with those in the female. 



The last pair of legs (fig. 11), as is usual in male Calanoida, are pecu- 

 liarly transformed and prehensile in character. They are rather large, scarcely 

 smaller than the natatory legs, and the development of the 2 legs is very 

 unequal, though both exhibit the same chief parts, viz, a biarticulate basal 

 part, and 2 styliform rami, the outer of which is 3-articulate, the inner uni- 

 articulate. The 1st basal joints of the 2 legs are partly coalesced, and the 

 2nd is very different in the 2 legs. In the right leg it is simple cylindric, 

 and projects far beyond that of the left leg. The 2 rami of this leg are 



