REPORT ON THE SCHIZOPODA. 87 



The antennal scale (see fig. 2) exhibits a form somewhat different from that in the 

 other species, being rather elongate, oblong-linear, and projecting a little beyond the 

 second joint of the antennular peduncle. The apex is obtusely truncate, and the outer 

 angle juts out into a well marked, dentiform projection. 



The mandibular palp (fig. 5) is very slender, its terminal joint being nearly as long 

 as the median, but very much narrower, linear, and armed with six spiniform bristles, 

 increasing gradually in length toward the apex. 



The first pair of maxilla (fig. 6) have the exognath very large and oval in form, but 

 in other respects resemble those of Eu^oliausia splendens. 



The second pair of maxillas (fig. 7) are more particularly distinguished by the 

 remarkable size and oblong-ovate form of the terminal joint. 



The legs are very slender and elongate, the ischial joint being much the largest, and 

 in the fifth pair (fig. 8) exceeding in length even all the succeeding joints taken 

 together. They are, moreover, furnished with a very dense fringe of remarkably long 

 and delicate setse. 



The gUls (see figs. 1, 8) would seem, on the whole, to agree comparatively closely 

 in structure with those of Euphausia pellucida. 



The telson (see fig. 3) about equals in length the two posterior segments taken 

 together, exhibiting a somewhat less slender form than in the other species, rather 

 flattened throughout and tapering but slightly, with the apex lanceolate. It is armed 

 with three pairs of very small dorsal denticles, exclusive of the subapical spines, which 

 are rather strong and smooth. 



The uropoda {ibid.) are much shorter than the telson, and have the inner plate 

 slightly projecting beyond the outer. 



Habitat. — Of this species, numerous specimens were collected in a single locality, viz., 

 at the ice-barrier in the Antarctic Ocean. They were, as usual, taken in the tow-net, 

 at the surface of the sea. The locality is as follows : — 



Station 153, February 14, 1874 ; lat. 65° 42' S., long. 79° 49' E. 



Moreover, several ver}^ young specimens and larA^se, apparently of the same 

 species, were collected in two other localities near that stated above, viz., at Stations 

 152 and 156. 



Hence there cannot, I think, be the slightest doubt as to this species constituting a 

 form quite peculiar to the Antarctic region. 



20. Euphausia mucronata, G. 0. Sars (PL XY. figs. 9-11). 



Eiiphmtsia mucronata, G. 0. Sars, PreUmiiiary Notices on the Challenger Schizopoda, No. 19. 



Specific Characters. — Form of body as in Eiiplumsia splendens. Carapace with a 

 single lateral denticle, about the middle of the inferior margin ; anterior part ha^ang a 



