84 THE VOYAGE OF H.M.S. CHALLENGER. 



The uropoda (see fig. 4) reach very nearly to the tip of the telson, and have the inner 

 plate projecting slightly beyond the outer. 



Habitat. — The two specimens secured were taken at the following localities : — 



Distribution. — The distribution of the species, as yet known, would accordingly 

 seem to be restricted to the Southern and Antarctic Oceans. 



18. Exqjliausia swperba, Dana (PI. XIV. figs. 5-9). 



Euphausia superba, Dana, United States Exploring Expedition, vol. xiii., Crustacea, p. 645, 



pi. xliii. fig. 1, a-o. 

 Euphatisia superba, G. 0. Sars, Preliminary Notices on the ChaUonger Schizopoda, No. 17. 



Specific Characters. — Body rather compressed. Carapace narrow, without any lateral 

 denticle ; anterior part scarcely at all keeled above ; rostral projection very small, and 

 obtusely rounded. Caudal segments smooth above, with very large epimera. Last 

 segment short, not longer than preceding ; preanal spine obsolete. Eyes large, pyriform. 

 Antennular peduncle very strong, having above, at the end of the basal joint, a small, 

 c-ordiform lobe. Antennal scale comparatively short, ovate, apex obliquely rounded. 

 Exopods of legs, as also pleopods, very powerfully developed. Gills well-nigh as in 

 Euphausia murrayi. Telson with apex very slightly jjroduced ; subapical spines slender 

 and smooth. Uropoda reaching beyond tip of telson, inner plate shorter than outer. 

 Length attaining 48 mm. 



Remarks. — There cannot, I think, be any doubt whatever as to the identity of the 

 form treated of here with Dana's Eupjhausia superba, and, moreover, the specimen in the 

 collection had been labelled with that name by the late Dr. v. Willemoes-Suhm. It is 

 readily distinguished from aU the preceding species, not only by its large size, but also by 

 the very short and obtuse rostral projection, the absolute want of lateral denticles on the 

 carapace, the remarkably thick antennular peduncles, and the powerful development Itoth 

 of exopods and j)leopods. 



Description. — The solitary specimen procured during the Expedition is an adult male, 

 measuring 48 mm. in length. 



The general form of the body (see PI. XIV. fig. 5) is as in Euphausia murrayi, 

 though comparatively more compressed. 



The carapace is rather narrow, and lacks every trace of lateral denticles, and, 



