KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 123 



than those of the two preceding pairs, but of the same elongate form; the outer margin 

 of the outer ramus and the inner margin of the inner ramus are fringed with short hairs, 

 the two other margins, which are in contact, are armed with short spines ; the outer ramus 

 is longer than the inner one, and equals in length about three fourths of the peduncle. 

 The telson is large, bluntly triangular and as long as broad ; it is much broader than 

 the peduncle of the last pair of uropoda and half as long; it is also longer than half the 

 last, coalesced, ural segment. A rounded process projects from the under side of the telson 

 between the bases of the last pair of peduncles. 



The female. 



PL VIII, fig. 1, 3, 4, 13, 14 and 18. 



The body is only a little wider than in the male, the hind part is comparatively 

 shorter. 



The head is larger than in the male, as long as the first three peraeonal segments 

 together and not fully twice as deep as long. The antennal groove is compara- 

 tively small. 



The eyes are similar to those in the male, but hairs are more densely set between 

 the facets. 



The first pair of antenna? (PI. VIII, fig. 3 and 4). The first joint of the peduncle 

 is very large and thick, irregularly globular, longer than the two following peduncular 

 joints together; the second joint is cylindrical, as long as broad; the third joint is a little 

 longer than the second, somewhat wider at the apex. The only flagellar joint is longer than 

 the whole peduncle, comparatively slender, and feebly tapering towards the apex, where 

 it is rounded. On the inner side of the flagellum there are some few olfactory bristles, 

 which seem to be two-jointed (PL VIII, fig. 4). 



The second pair of antennce are unusually small, and feebly developed. They consist 

 of only two short joints, and are fixed at the limit between the front and under margins 

 of the head, not visible in a side-view of the animal. 



The mouth-organs are like those in the male. 



The perceon is built in the same peculiar manner as in the male, the anterior parts 

 of the second to sixth segments being elevated, but the rolls thus formed are higher and 

 more strongly convex. The first segment is not fully half as long as the second segment, 

 the seventh one is the longest of all. 



The epimerals are as long as the under margins of the corresponding segments. 

 The epimeral of the first pair is as deep as long, that of the second pair is a little longer 

 than it is deep, those of the following pairs are more than twice as long as deep. 



The branchial sacks are fixed to the second to sixth pairs of perseopoda, they are 

 a little longer than the femora of the corresponding pairs. 



The ovitectrices are fixed to the second to fifth pairs ; they are irregularly triangular, 

 broadest at the apex, somewhat longer than the branchial sacks. 



