24 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



dactylis ejusdem paris pedunculatis. Segmenta uri duo ultima coalita. Pedes uri angusti 

 minute serrati; rami externi elongati, angusti, tertii paris dimidium pedunculi aequantes. 

 Rami interni primi paris pedunculis longiores, secundi paris pedunculis multo breviores, 

 illi tertii paris pedunculos longitudine a?quantes. Telson elongatum, triangulare. 



The body is keeled, the lateral parts of the pereion provided with a distinct margo. The 

 head is rostrate, almost twice as deep as long, with two divergent keels on the upper 

 side. The first pair of aidennce equal a fourth of the length of the body. The femora of 

 the first four pairs of pereiopoda are dilated, ovate. The fifth pair are much longer than 

 the sixth; the anterior margin of the femur is smooth, the posterior margin spinously 

 serrated; the femur is much shorter than the three following joints together; the apical 

 spine-like process is curved, simple, a little longer than the genu; the tibia is much longer 

 than the carpus; the carpus is a third longer than the metacarpus. The seventh pair equal 

 a third of the length of the fifth pair; the dactyli of the seventh pair are pedunculated. 

 The last two ural segments are coalesced. The urop>oda are narrow, minutely serrated; 

 the exterior rami are long and narrow; those of the third pair are as long as half the 

 peduncles. The interior rami of the first pair are longer than the peduncles; those of 

 the second pair much shorter than the peduncles; those of the third pair" are as long as 

 the peduncles. The telsov is elongated, triangular. 



Colour. Reddish white. 



Length. 5 mm., without the antenna? 4 mm. 



Hab. Off Cape Horn; taken by the late Captain Geokge von Scheele. (U. M.). 



Syil. 1885. Tyro Tullbevgi, C. BOVALLIUS. »On some forgotten genera among the Amphipodous 



Orustacea». Bill. t. K. Sv. Vet. Ak. Hand]. Bd. 10. 

 N:o 14, p. 15. 

 » » » 1887. "Arctic and Antarctic Hyperids». Vega-Exp. Vetensk. 



Iakttagelser. Bd. 4, p. 532, pi. 40, fig. 4—10. 



It is a small delicate species with uncommonly well developed eyes and slender legs. 

 Only the female is known. 



The body is shorter and thicker than in the preceding species, with the dorsal side 

 feebly keeled from the head to the first ural segment. 



The anterior margin of the head projects into a very short, obtuse rostrum. 



The eyes (PI. Ill, fig. 2) are comparatively large, quite as large as in Tyro margi- 

 nata, consisting of twelve hexagonal or pentagonal ocelli or rather groups of ocelli. 



The first pair of antenna* (PI. Ill, fig. 3) are short and stout; the peduncle is 

 about a fourth of the length of the fiagellum. The flagellum is three-jointed, the first 

 joint is six times as long as the last two together; the second joint is almost three times 

 as long as the third, both without hairs. 



The pereion is very much arched, the fourth joint is the longest; the last three segments 

 are scarcely longer than the two preceding together; the lateral parts of the segments form 

 a margo, Avhich is not, however, so prominent as in the preceding species. 



The four anterior pairs of epirnerals are a little deeper than in Tyro marginata. 



