REPORT ON THE SCHIZOPODA. 79 



15. Euphausici sdmilis, G. 0. Sars (PI. XIII. figs. 1-G). 



Euphausia similis, G. 0. Sars, Pieliminiiry Notices on the Challenger Schizopoda, No. 14. 



Specific Characters. — Form of body somewhat more Mleuder tlian in the preceding- 

 species. Carapace with only a single, small, lateral denticle at the middle of tlie 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 ; j^reanal 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 Ettphausia 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 ha^ang but a single lateral denticle on 

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

 and finally, too, by a somewhat different relation in length between the terminal plates 

 of the uropoda, as also by the simple structui'e of the preanal spine. 



Desc7'iption. — 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 PI. 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 antennulse. 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 species, smooth above, and taper 

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

 and project not inconsiderablj', w^hereas the two posterior pairs exhibit a somewhat 

 difiierent aspect, projecting, as they do, a trifle less, and having the lower margin 

 slightly incurved, as also the •po^'^terior 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. 



