14 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



third of the fifth pair. The last two aval segments are coalesced. The uropoda are broad, 

 minutely serrated; the exterior rami of the first and second pairs are small; those of the 

 third pair are large, almost as long as the peduncle. The interior rami of all the three 

 pairs are much longer than the peduncles. The telson is tongue-shaped, narrow, scarcely 

 half as long as the exterior ramus of the third pair of uropoda. 



Colour. Yellowish brown. 



Length. 11 — 12 mm.; (without antenna? 7 — 8 mm.). 



Hab. The south Atlantic, the Indian Ocean (S. M.) 



Syil. 1885. Tyro atlantica, G. BOVALLIUS. »On some forgotten genera among the Amphipodous Crustacea". 



Bih. t. K. Sv. Vet. Ak. Handl. Bd. 10. N:o 14, p. 14. 



The body, the head, and the eyes are very similar to those; in Tyro Sarsi. 



The first pair of dntennce, (PI. II, fig. 12 and 13) have the peduneles longer than 

 in the preeeding speeies, almost equalling a sixth of the length of the fiagelluni. The 

 elongated first joint has the same form and armature as in the preceding speeies, but the 

 second joint is a little longer, equalling about a tenth of the first joint; it carries a straight 

 bristle at the tip. 



The first 'pair of pereiopoda have the carpus only a little longer than the meta- 

 carpus (17:15) and the lower anterior corner of the metacarpus not produced. The 

 dactyl us is feebly curved, as long as half the metacarpus, wanting the characteristical 

 notch at the base, mentioned in the preceding speeies. 



The fifth pair (PI. II, fig. 14 and 15) are of the same appearance as in Tyro Sarsi, 

 but the anterior margin of the femur is smooth and the spine-like process is shorter and 

 broader, and not much longer than the genu. The metacarpus is quite as long as half the 

 carpus, very slender. The dactylus is short but stout, beset wifh fine hairs. (PI. II, fig. 15). 



The sixth pair (PI. II, tig. 16) are much shorter than the fifth; the femur is narrow, 

 linear; the anterior margin of the tibia and carpus smooth, that of the metacarpus 

 slightly serrated. 



The seventh pair (PL II, fig. 17) are shorter than the femur of the fifth pair; the 

 dactylus is short and strong. 



The pleopoda; the peduncles are as long as the rami; the outer ramus with 6 joints, 

 the inner with 8 joints. 



The urus (PI. II, fig. 18); the coalesced second and third segment is shorter and 

 narrower than the first segment. 



The uropoda; the inner rami of all the pairs are much longer than the corresponding 

 peduncles. The exterior rami of the first pair are small but distinct; those of the second 

 pair are a little longer, almost equalling a sixth of the length of the peduncle (3 : 19). 

 The exterior rami of the third pair are large, finely serrated along the inner margin, a 

 little shorter than the peduncle (7 : 8). The serrations on the uropoda are the same as in 

 the preceding species. 



