42 Gr. O. Sars. 



shape (see fig. 1), though, on a closer comparison, it diiïers in 

 that the posterior extremity is somewhat narrower and more 

 produced. Seen from the dorsal or ventral face (fig. 2), it 

 appears fully as tumid as in the female; but the greatest 

 width does not occur in the middle, but somewhat more 

 in fronto 



The enclosed animal (see fig. 3) distinguishes itself at 

 once from that of the female both by the very different form 

 of the rostrum and by the structure of the 1st pair of legs. 



The head (see figs 3 & 4) appears on the whole com- 

 paratively shorter and stouter than in the female. This is 

 chiefly due to the peculiar development of the rostral expansion, 

 which is far less produced and, as it were, cut oif at the tip. 

 In a lateral view of the animal, the head therefore appears 

 blunted at the end, instead of being drawn out to an acute 

 angle, and the dorsal and lateral keels do not meet, as in 

 the female, but terminate, each separately at the edges of the 

 plain apical face. Viewed in front (fig. 5) the head looks also 

 very different from that of the female, the rostrum being much 

 shorter, slightly widening distally, and transversely truncated 

 at the tip, with the terminal edges finely ciliated. 



The antennulæ (see figs 4, 5) are perhaps a little larger 

 than in the female, but otherwise of the very same structure. 



Also the antennæ and oral parts agree in their structure 

 perfectly with those parts in the female. 



The legs are only 10 pairs in number, and accordingly 

 also the segments of the trunk (see fig. 3) are reduced to 10, 

 instead of being 12, as in the female. Of the legs, only the 

 1st pair are modified to grasping organs, whereas the 2nd pair 

 (fig. 8) are of exactly the same structure as in the female. 



The 1st pair of legs (fig. 6) have the 2 proximal endites 

 confluent to a single broad expansion. The hand (see also 

 fig. 7) is nearly quadrate in form, though somewhat broader 

 at the base than distally. It has no projecting thumb, and 



