REPORT ON THE SCHIZOPODA. 215 



Remarks. — The present species may be easily known from the preceding by its 

 exceedinoly narrow tail, the last segment of which is greatly elongate, by the short 

 and thick eyes, the narrow antennal scale, and the want of lateral denticles on the 

 telson. 



Description. — Only a single specimen, apparently a young female, was procured during 

 the Expedition. It lias a length of 8 mm. 



The form of the body (see PL XXXVII. fig. 21), somewhat deformed in the .specimen 

 by pressure, would appear to be much more slender than in ExichcEtomera typica, and 

 the tail in particular is remarkably narrow, as compared with the anterior division. 



The carapace w^ould seem to be relatively larger than in the i)receding species, its 

 wings partly advancing over the first caudal segment. It exhibits, however, posteriorly 

 in the middle, a deep but narrow emargination, exposing the dorsal part of the two 

 posterior segments of the trunk. The frontal margin presents in the middle a very .slight 

 projection, scarcely reaching beyond the ocular segment. 



The caudal segments are cylindrical, and the four anterior very short and subequal, the 

 fifth a trifle longer, and the last exceedingly elongate, nearly as long as the preceding 

 three taken together. 



The eyes are greatly expanded toward the apex, being broader than long, and 

 originate close together, so as not to ^^rojcct laterally. The cornea exhibits, somewhat 

 anterior to the middle, a transverse constriction similar to that in the preceding species. 



The anteunular peduncle appears somewhat more slender than in Euchcetomera tijpica, 

 but otherwise exhibits a very similar structure. 



The antennal scale (fig. 22) is very narrow, linear, about six times as long as broad,, 

 and very slightly curved. As in the preceding species, the apex is obliquely truncate, 

 with the inner corner somewhat projecting and the outer armed with a dentiform pro- 

 jection, but the latter is far from so strong as in that species. 



The legs (fig. 23) are extremely slender, and the posterior pair reach, when reflexed, 

 even beyond the last caudal segment (see fig. 21). In their structure they agi'ee "ndth 

 those in the preceding species, saving that the marginal setae are fewer in number and 

 also rather more elongate. 



The telson (fig. 24) exhibits a short lamelliform shape similar to that of Euchceto- 

 mera tyjjica, being but very little longer than broad, but difi'ers materially in the lateral 

 edges being perfectly smooth, without a trace of the strong denticles occurring in that 

 species. The apex is narrowly truncate, with a very small dentiform projection on either 

 side, and the terminal setae placed close together. 



The uropoda do not seem to diff'er essentially from those in Evchcetomera tijpica, 

 saving that their terminal plates are a trifle more slender. 



Habitat. — The above described specimen was taken November 18, 1875, at the 

 surface of the sea, in the South Pacific, oft" the coast of Chili. 



