EEPORT ON THE SCHIZOPODA. 79 



15. Euphausia dmilis, G. 0. Sars (PL XIII. figs. 1-6). 



Euphansia dmilis, G. 0. Sars, Preliminary Jfotices on the Challenger Schizopoda, No. 14. 



Specific Characters. — Form of body somewhat more slender than in the preceding 

 species. Carapace with only a single, small, lateral denticle at the middle of the inferior 

 margin ; rostral projection rather produced, and very acute. Caudal segments smooth 

 above ; epimera of fourth and fifth segments small, and slightly emarginate inferiorly. 

 Last segment very elongate ; preanal spine diminutive, and simple. Eyes pyriform. 

 Antennular peduncle without any distinct dorsal leaflet. Antennal scale rather broad, 

 ovate, obliquely rounded at the apex, outer corner unarmed. Subapical spines of telson 

 much smaller than in Euphausia pellucida, and quite smooth. Inner plate of uropoda 

 shorter than outer. Length reaching 30 mm. 



Remarks. — This species is very nearly related to Euphausia pellucida, but attains 

 almost twice the size of that form. Moreover, the animal may easily be recognised by 

 the rostrum being considerably more produced, by having but a single lateral denticle on 

 the carapace, by the miich shorter and perfectly smooth subapical spines of the telson, 

 and finally, too, by a somewhat difi"erent relation in length between the terminal plates 

 of the uropoda, as also by the simple structure of the preanal .spine. 



Description. — Of the present species the collection contains but one specimen, an 

 adult male. It measures 30 mm., and hence has about double the length of the speci- 

 mens belonging to the preceding species. 



The general form of the body (see PL XIII. fig. 1) approximates to that of Euphausia 

 pellucida, though perhaps a trifle more slender. 



The carapace has the anterior part but very slightly keeled above, and it runs out as 

 a comparatively long and very acute rostral projection, reaching beyond the middle of 

 the basal joint of the antennulas. On the inferior margin occurs but a single small 

 denticle, placed a little in front of the middle, or somewhat behind the base of the first 

 pair of legs. 



The caudal segments are, as in the preceding sj^ecies, smooth above, and taper 

 out gradually backward. The three anterior pairs of epimera present the usual form, 

 and project not inconsiderably, whereas the two posterior j)airs exhibit a somewhat 

 difi"erent aspect, projecting, as they do, a trifle less, and having the lower margin 

 slightly incurved, as also the posterior lobe narrowly produced. The last segment 

 is very elongate, and the preanal spine exceedingly small and quite simple, claw- 

 shaped. 



The eyes (see fig. 2) are rather large and pyriform, with the cornea greatly expanded. 



The antennular peduncle (ibid.) exhibits much the same appearance as in Euphausia 

 pellucida, but lacks any distinct dorsal leaflet, the basal joint forming at the extremity 

 above only a slight, well nigh imperceptible lobe. 



