14 CAIU, r.oVAl.LIUS, AIMl'IIll'OI)A 11 V]'KH1 IDKA. 



tliiid ul tlic liltli pair. Tliu lust two nral KUginciits aro cualcsccd. Tlic nrojmJa are broad, 

 ininiituly scrrutiHl; tliu exteriör ranii of thc first and second j)airs are small; those of the 

 third pair are hirge, aliiio.st as loiig as tlie ))edimcle. Tlie int(;rior rami of all thc three 

 pairs are nnich longcr than the j)eduiie]es. The bdsou is tongue-shapcd, uarrow, scarcoly 

 half as long as the exteriör ramus of the third pair of iiropoda. 



Colour. Yellowish browii. 



Loilgth. 11 — 12 111111.; (without antenna; 7 — 8 nnii.). 



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



Syil. 1885. Tyro atlaidica, C. BOVALLIUS. »Oii some forgotteu genera iimoiig thc Amphipodous Crustacea^). 



Bill. t. K. Sv. Vet. Ak. liaiidl. Bd. 10. N:o 14, p. 14. 



Thc3 body, the head, and the eyes are very similar to thosi^ in Ty ro Sard. 



The Jirst pair of antennw, (Pl. II, fig. 12 and 13) have the peduncles longer than 

 in the preceding species, almost equalling a sixth of the length of the flagellum. 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 carrics a straight 

 bristle at the tip. 



The Jirst pair of pereiopoda have the carpus only a Jittle longer than the meta- 

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

 dactylus is feebly curved, as long as half the metaoarpus, wanting the characteristical 

 notch at^ the base, mentioned in the preceding speeies. 



The fift/i pair (Pl. II, tig. 14 and 15) are of the same appearance as in Tyro Sarsi, 

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

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

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



The sixth pair (Pl. II, fig. 16) are much shorter than the tifth ; the femur is narrow, 

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

 slightly serrated. 



The seventh p)air (IM. 11, tig. 17) are shorter than the femur of the iifth 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 (Pl. II, fig. 18); the coalesced second and third segment is shorter and 

 narroAver than the first segment. 



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

 peduncles. The exteriör rami of the first pair are small hut distinct; those of the second 

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

 The exteriör rami of the third jiair are large, finely serrated along the inner margin, a 

 little shorter than the peduncle (7 : 8). The serrations on the uropoda ai'e the sanie as in 

 the preceding species. 



