KONGL. SV. VET. AKADEMIENS HANDL1NGAR. BAND. 21. N:0 5. 57 



The sixth pair (PI. VII, fig. 31); the femur is broadly ovate. The anterior margin 

 of the carpus is fringed with short, equidistant hairs. The metacarpus is sharply ser- 

 rated. The dactylus is a fourth of the length of the metacarpus. 



The seventh pair (PL VII, tig. 32 and 33) the femur is uncommonly large, almost 

 as broad as long, longer than the three following joints together. The dactylus, shorter 

 than the metacarpus, is thicker at the lower end, plated with small, ovate, spiniferous scales. 



The pleon is very large, much longer than the last four pereional segments. The 

 lateral parts of the segments are very deep, the hinder corner angulated. 



The peduncles of the pleopoda are shorter than the rami. The rami are 15- to 16- 

 jointed. 



The urus is shorter than the last pleonal segment. The first segment is almost 

 as long as the two following together, the second segment is only a little shorter than the 

 third. The hinder corners of the third seg'ment are rectangular, not produced. 



The uropoda (PI. VII, fig. 34); the first pair reach nearly to the end of the last pair; 

 the peduncle is broad, linear, only a little longer (21:19) than the rami; the rami are 

 equal in length, narrow, acute, finely serrated along both margins. The second pair reach 

 almost as far as the first pair; the peduncle is broad, linear, about as long as the interior 

 ramus; the exterior ramus is shorter than the interior one, smooth on the outer margin, finely 

 serrated on the inner. The third pair have the peduncle a little narrowed above, longer 

 than the last two ural segments together, and longer than the rami; the rami are almost 

 equal in length, elongate-lanceolate, acute. The exterior ramus is smooth on the outer 

 margin and finely serrated along the inner; the interior ramus is serrated along both margins. 



The telson is large, triangular, rounded behind, much longer than half the peduncle 

 of the last pair of uropoda and nearly as long as the last two ural segments. 



7. VIBIL1A BOREALIS, SPENCE BATE and WESTWOOD, 1868. 



Vibilia borealis, Spence Bate and Westwood. 

 Facsimile from Sp. Batk and Westwood. Brit. Sessile-eyed Crust. TI, p. 524. 



Diagn. Caput non rostratum, segmentis duobus primis pereii longius. Oculi niodici. Elagellum au- 

 tennarum primi paris ante rotundatum, caput cum segmentis duobus primis pereii longitu- 

 dine fequans. Pedes pereii curti, non hirsuti. Femora pedum parium quatuor priorum 

 angusta cylindrica, femora parium trium ultimorum dilatata. Tibiaj pedum tertii ac quarti 

 parium non tumidse, dactyli brevissimi. Pedes quinti et sexti parium pedibus tertii et 



K. Sv. Vet. Akad. Handl. Band. 21. N:o 0. ° 



