KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 21. N:0 5. 23 



The fifth pair (PI. Ill, fig. 27) are considerably longer than the sixth pair; the 

 femur is broader than in the other species, only five times longer than broad; the 

 anterior margin shows 5 — 6 strong sharp teeth, the posterior is obtusely serrated; the 

 apical process is very strong, quite straight, live times longer than the genu; the tibia 

 is a little shorter than the carpus (21 : 22); the metacarpus is longer than half the 

 carpus, tolerably stout. The dactylus is short, strongly curved, and robust, thicker at 

 the base, with small opening, and a very short spine at the middle of the hinder margin. 

 (PI. Ill, fig. 28). 



The sixth pair (PI. Ill, fig. 29 and 30); the tibia, carpus and metacarpus are 

 broad, almost tumid; the tibia a little shorter than the carpus, the carpus longer than 

 the metacarpus. The dactylus as in the preceding pair. 



The seventh pair (PI. Ill, fig. 31 and 32) are exactly of the same form as the sixth 

 but much smaller (5:8); they are shorter than half the fifth (5:11). 



The pleon is a little longer than the last four pereional segments, the hinder corners 

 of the lateral parts of the segments are deeper than the anterior, and broadly rounded. 



The pleopoda; the peduncles are much longer than the rami; the exterior ramus is 

 7-jointed, the interior 9-jointed. 



The urus (PI. Ill, fig. 33) is almost shorter than the last pleonal segment; the last 

 two coalesced segments are shorter than the first. 



The uropoda; the inner rami of the first two pairs are longer than the peduncles, 

 those of the second pair are excavated at the interior margin and finely serrated, as is 

 also the inner margin of the peduncle. The outer margin of the interior ramus of the first 

 pair is sharply serrated. The interior ramus of the third pair is as long as the peduncle, 

 sharply serrated along the exterior margin. The exterior ramus of the first pair is short 

 and narrow, equalling about an eighth of the length of the interior ramus, that of the 

 second pair is long and narrow, almost as long as half the interior ramus. The exterior 

 ramus of the third pair is pretty broad, finely serrated along the inner margin, equalling 

 two thirds of the length of the interior one. 



The telson is very minute, much shorter than a tenth of the length of the peduncles 

 of the last pair of uropoda. 



9. TYRO TULLBERGI, C. BOVALLIUS, 1885. 



PI. Ill, fig. 1—9. 



Diagn. Corpus carinatum, lateribus pereii marginatis. Caput rostratum, duplo fere altius quam 

 longius, superne carinatum, carinis divergentibus. Avtennce primi paris quartam partem 

 longitudinis corporis aaquantes. Femora pedum pereii quattuor parium primorum lata, 

 ovata. Pedes quinti paris pedibus sexti paris multo longiores; femur ante leve, post 

 spinulose serratum, articulis tribus sequentibus multo brevius, spinam curvatam simplicem, 

 genu paullo longiorem gerens; tibia carpo multo longior; carpus metacarpo tertia parte 

 longior. Pedes septimi paris tertiam partem longitudinis pedum quinti paris aequautes, 



