On the genus Broteas of Loven. — Broteas falcifer. 19 



lamellar projections, similar to those occurriag on the 2 pre- 

 ceding joints, and meeting them, when this section is bent in 

 against the middle one. The 2 outer joints are rather short, 

 and the last terminates in a small, hook-like projection, much 

 as in the male of our common Biaptomus denticornis. 



The posterior antennæ, oral parts and natatory legs, do not 

 exhibit any difference in structure from those parts in the female. 



The last pair of legs (fig, 15), on the other hand, look 

 very different. They are much larger, and conspicuously 

 asymmetrical, the right leg being considerably larger than 

 the left and pronouncedly prehensile. Of the 2 basal joints 

 the distal one of the right leg is much larger than that of 

 the left, and is provided outside with a slender bristle. The 

 inner ramus on the left leg is very small and rudimentary, 

 knob-like, whereas on the right leg it is considerably produced, 

 reaching beyond the proximal joint of the outer ramus, 

 and tapering to an obtuse, finely ciliated point. The distal 

 joint of the outer ramus in this leg is much larger than 

 the proximal one, and oblong oval in form, slightly narrowed 

 distally, and provided outside near the tip with a com- 

 paratively small spine. To the end of this joint, a very strong, 

 somewhat flexuous claw is movably articulated. This claw, 

 which is fully as long as the last joint, is somewhat thickened 

 in the middle, and exhibits a fine serrulation along the 

 greater part of its inner edge. The outer ramus of the left 

 leg reaches about to the end of the proximal joint of the 

 right leg. Its distal joint is rather small, forming an 

 obtuse, unarmed lamella; but from the end of the proximal 

 joint originate, a very strong, claw-like spine, which crosses 

 the base of the terminal joint, curving downwards. This 

 spine, which at the base inside is accompanied by a slender 

 bristle, considerably exceeds in length the ramus itself. 



