KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 21. N:0 5. 25 



The first pair of pereiopoda (PI. Ill, fig. 4); the femur is elongate-ovate, the tibia 

 longer than the genu; the carpus is elongate-ovate, a little longer than the linear 

 metacarpus, which is narrower; both joints are beset with long hairs. The dactylus 

 is longer than half the metacarpus, feebly curved. 



The second pair (PI. Ill, tig 5); the carpus is shorter than the metacarpus, narrow, 

 linear; the dactylus is half as long as the metacarpus. 



The third and fourth pairs are slender, with the femora a little dilated, the tibiae 

 shorter than the carpi, and the dactyli long, feebly curved. 



The fifth pair (PI. Ill, fig. 6); the femur is linear, seven times longer than broad, 

 the anterior margin is quite smooth, the posterior spinously serrated; the apical process 

 is curved, a little longer than the genu. The tibia is very elongated, nearly twice as long 

 as the carpus (15:28), linear; the metacarpus equals two thirds of the length of the 

 carpus, both are linear; the dactylus is long, slender, feebly curved, longer than a third 

 of the metacarpus (2 : 5). 



The sixth pair are slender, the joints linear, not tumid, the carpus much longer 

 than the tibia. The dactylus as in the preceding pair. 



The seventh pair (PI. Ill, fig. 7) are short and slender, scarcely half as long as 

 the sixth pair, and shorter than the femur of the fifth. The joints are linear, not tumid; 

 the metacarpus is as long as the carpus; the dactylus is almost rectangularly bent, 

 pedunculated; at the base of the peduncular part there is an opening for the meta- 

 carpal glands. 



The pleon is a little shorter than the last four pereional segments (11:12). The 

 lower margins of the lateral parts of the segments are straight, with rounded corners. 



The pleopoda (PI. Ill, fig. 8) with the peduncles longer than the rami, the exterior 

 ramus with seven, the interior with nine joints. 



The urus is only a little shorter than the last two pleonal segments together; the 

 last two coalesced segments are as long as the first. 



The uropoda (PI. Ill, fig. 9); the first and third pairs are quite smooth, the 

 second serrated along the inner margin of the peduncle. The exterior rami of the first 

 pair are long, narrow, a third of the length of the interior ones; those of the second 

 pair are shorter, scarcely a fourth of the length of the interior ones; those of the third 

 pair are of the same form, equalling half the length of the corresponding interior rami. 



The telson is elongate-triangular, longer than a third of the peduncle of the last 

 pair of uropoda. 



10. TYRO PACIFIC A, C. BOVALLIUS, 1887. 



PI. Ill, fig. 10—17. 



Diagn. Corpus non carinatum. Caput paullo ^altius quam longius, superne indistincte carinatum, 

 carinis divergentibus. Antennae primi paris dimidio corporis paullo bi-eviores. Femora 

 pedum pereii quattuor parium primorum angusta. Pedes quinti paris pedibus sexti paris 



K. Sv. Yet. Akail. Handl. Hand. 21. N.o 5. 4 



