20 G. O. Sars. 



The antennulæ, antennæ and oral parts do not exhibit 

 any peculiarity in their structure. 



The legs, too, the number of which is 25 pairs, are 

 built much on the same type as in the preceding species. 

 Figs. 6, 7, 8 represent a leg of the 2nd, 9th and 10th pairs, 

 seen from the posterior face. It will be seen from these 

 figures, that the appendicular plate of the exopodite, so 

 characteristic of the present genus, is greatly developed and 

 of the usual securiform shape. Moreover, the lobular cha- 

 racter of the distal part of the exopodite is even still more 

 pronounced than in the preceding species, the lobules being 

 very sharply defined, constricted at the base, and separated 

 by deep incisions. The epipodite in the 2 anterior pairs (see 

 fig. 6) is rather small, but in the succeeding pairs it gra- 

 dually increases in length, attaining its maximum size in 

 the 9th pair (fig. 7). In this pair, the dorsal lappet of the 

 exopodite is drawn out to a slender thread-like lash, which 

 penetrates more or less deeply into the egg-masses visible 

 on each side of the body, at about the middle (see fig. 31), 

 thus assisting the corresponding, much transformed parts of 

 the 2 succeeding pairs (fig. 8) in keeping the egg-masses in 

 place. 



The caudal piece (see fig. 5) exhibits the structure cha- 

 racteristic of the present genus, forming above at the base 

 a rounded heel-shaped prominence, from which the delicate 

 caudal setæ originate. Below this prominence, the shghtly 

 concaved edges of the caudal plates are armed with 

 numerous small denticles of rather a uniform appearance, 

 and extending to about the middle of the strong spini- 

 form projections, in which these plates terminate below. 

 The caudal claws are about twice as long as the above- 

 mentioned projections, very slightly curved, and minutely 



