REPORT ON THE SCIIIZOPODA. 217 



Description. — Only a solitaiy, somewhat mutilated specimen, an adult female, was 

 procured on the Expedition. It measures only 6 mm. in length. 



The form of the body (see PL XXXVIII. figs. 1, 2) is remarkaljly short and thick- 

 set, more so than in any of the previously known species, with the anterior division 

 somewhat dilated. 



The carapace is evenly arched above and deeply emarginate posteriorly, exposing the 

 dorsal part of the two last segments of the trunk. It has a distinct, though not \Qvy 

 sharply marked cervical sulcus, and its inferior margins are evenly incurved in the 

 middle. The frontal margin projects in the middle almost at a right angle, covering a 

 part of the ocular pedicles, and the antero-lateral corners are but slightly produced as 

 rather broad, obtuse-angled lobes. 



The caudal segments are all well-nigh of equal length and a little depressed, their 

 breadth being somewhat greater than their height. 



The eyes are comparatively small, of a regular ovoid form, and projecting but .sHghtly 

 at the sides. The cornea occupies about one-third of the eye, and has a dark pigment. 



The antennular peduncle (fig. 3) is rather short and thick, with the last joint as large 

 as the basal, and the middle joint very obliquely truncate at the end. 



The antennal scale (fig. 4) is exceedingly small, scarcely as long as the antennular 

 peduncle, and of an oblong-oval form, about three times as long as broad. It is fringed 

 all round with long setae (omitted in the figure), and has a very short terminal articulation. 



The oral parts could not, of course, be examined closely in the sole specimen before us. 



All the legs were broken oif, their basal parts only being left. 



The marsupial pouch (see fig. 1) was fully developed in the specimen, and contained 

 young, in the so-called pupa stage (figs. 6, 7), agi-eeing perfectly with those of other 

 Mysidans. 



Tlio tolson (fig. 5) is of a somewhat triangular form, broadest at the base, and 

 regularly tapering toward the apex. The lateral borders are in greater part quite smooth, 

 armed in their hinder part only, on either side, with about six denticles. The apical 

 incision is very deep, occupying, as it does, fully one-third of the length of the telson, 

 and also rather broad. The edges limiting the incision are quite smooth in their hinder 

 half, whereas a dense fringe of spinules runs along the anterior part, much as in the 

 Norwegian species. The terminal lobes are rather narrow, and bear on the tip two 

 somewhat unequal spines, the outer being the longer. 



The uropoda (see fig. 2) do not exhibit any essential difi'erence from those in the 

 other species, their terminal plates being comparatively broad, and the inner plate much 

 shorter than the outer, with the auditory apparatus distinctly developed. 



Habitat. — The above-described specimen I took from a small bottle containing 

 specimens of Paranebalia longipes (Willcmoes-Suhm), collected in shallow water at the 

 Bermuda Islands. 



(ZOOL. CHALL. EXP. PART XXXVII. — 1885.) Oo 28 



