10 Carl Bovallius, 



of the segment. The femur is more than thrice as long as broad (10: 3), 

 linear, smooth. The genu and tibia as in the preceding pair. The carpus 

 is long and broad, swollen or inflated, containing a row of glands; possibly 

 the secretions of the glands pass into the metacarpus and throngh a large 

 opening behind the dactylus out into the water [PI. II. fig. 20]. The 

 vietacarpus is only half as long as the carpus, broad and wide; the aper- 

 ture in its lower end, behind the dactylus, is bordered with long hairs, 

 which are bent as hooks at the tips. The dactylus is shorter than a 

 fourth of the metacarpus, broad, and feebly curved. Only in one speci- 

 men there was a branchial sack; this was shorter than the femur. 



The pleon is built in the ordinary way, not inflated, rather more 

 slender than in the true Hyperiœ. The first segment is the longest 

 and deepest, but not twice higher than the third (3: 2). The third is 

 the shortest. The hinder corners of the segments are rounded. The 

 pleon and urus together are longer than a third of the diameter of 

 the globe. 



The pleopoda. The peduncles are longer than the flagella. The 

 third pair are much shorter than the preceding. The flagellum of the 

 first pair consists of 9 — 12 articuli, which carry long plumose hairs or 

 ciliée. [PI. III. fig. 26]. 



The urus [PI. III. fig. 27] consists of two joints, the second and 

 third being coalesced, as usual among the Hj^perids. The first joint 

 is a little shorter than the second, but broader. The second, or coalesced 

 one, is a little narrower behind. 



The first 2}air of uropoda are long, slender, but do not roach quite 

 to the end of the second pair. The peduncle is shorter than the inner 

 ramus, linear, smooth, with a bristle at the lower inner corner. The in- 

 ner ramus is twice longer than the outer, and much broader at the base, 

 sharply pointed downwards, and feebly bent; it is serrated along both 

 margins. The outer one is very narrow, very feebly bent at the tip; the 

 outer margin even, the inner finely serrated. 



The second pair. The peduncle reaches beyond the end of the 

 peduncle of the first pair; it is shorter than the inner ramus, linear, 

 smooth. The inner ramus is a third longer than the outer, and a little 

 broader at the base, straight; the outer margin is even, the inner pro- 

 vided with minute hairs only at the tip. The outer ramus is straight, the 

 outer margin even, the inner armed in the same way as the inner ramus. 



The third pair are very stout. The peduncles very broad, shorter 

 than the inner ramus, smooth. The inner ramus, broad at the base, 



