KONGL. SV. VET. AKADEMIENS UANULINGAlt. BAND. 22. N:U 7. 371 



The female. 



Pl. XVI, lijr. 8-18. 



The peroion. The third segment is shorter thaii the first tuo logether; tlio seveiith 

 segment is as long iis the tlivee ])rececling together. 



The Jirst and aecond paiv.s of perceopoda (Pl. XVI, fig. 10 — 12) are like those in 

 the preceding species in shape, but the femiii- is much longer than the three following 

 joints together. 



The third and fourtli pairs (Pl. XVI, fig. 1,3 and 14). The lowcr hind corner of 

 the fem ur, as well as that of the genu, projects into a sharp poiiit. The front margin 

 of the tibia, earpus, and metaearpus is fringed with minute spines. The lower front 

 corner of the metaearpus is produeed into an elongate-triangular, sharp-pointed process 

 in front of the curved dactylus. 



The fifth pair (Pl. XVI, fig. 15) are only a little longer tlian the fourth. Tlie fe- 

 mur is feebly bent in the shape of a S, with the upper half of the front margin concave, 

 and tlie lower half feebly convex: the lower front corner is angular and sharp-pointed; 

 the up])er part of the liind margin is strongl}- convex, the lower part excavated, and iiear 

 the lower corner pi-oduced into a tolerably long and sharp-pointed process. The lower 

 front corner of the genu projects into a sharp point. The stem of the earpus is 

 elongated, but not twice as long as broad; the carpal process is more than twice as long 

 as the tubercle on the under margin of the earpus, and scarcely a third part as long as 

 the stem of the joint. The tubercle on the under margin is slightly incised at the top, 

 but not two-pointed, and not distinctly crenulated. The metaearpus is arched, nearly 

 as long as the stem of the earpus, and provided with a broad faintly crenulated tubercle 

 at the middle of the front margin. A dactylus is pi'esent only in the younger spe- 

 cimens. 



The sixth p)air (Pl. XVI, fig. 16) reach beyond the apex of the earpus of the fifth 

 pair. The fem ur is straight, with the lower front corner produeed into a sharp-pointed, 

 feebly curved process; the femur is fully as long as the three following joints together. 

 The lower front corner of the genu projects into a sharp point, as does also the upper 

 front corner of the tibia. The metaearpus is more than half as long as the earpus. 



The seventh pair (Pl. XVI, fig. 17) are shorter than the sixth. The femur is more 

 than a third part longer than the femur in the sixth pair, nearly twice as long as all 

 the following joints together, and about six times as long as broad; it has the lower front 

 corner produeed and sharp-pointed as in the sixth pair. The genu and tibia are armed 

 as in the preceding pair. The earpus equals a fourth part of the length of the femur, 

 but is not twice as long as the metaearpus. 



The pleonal segments have the lower hind corner angular but not produeed. 



The uropoda. The Jirst pair do not reach to the apex of the last; the peduncle is 

 more than twice as long as the equal rami. The second pair reach only a little beyond 

 the apex of the peduncle of the first pair, but do not attain the apex of the peduncle of 

 the third pair; the inner ramus is narrower, and considerably shorter, than the outer. 



