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



The auteuual scale (see fig. 2) is rather broad and oval in form, with the apex 

 obliquely rounded, and the outer angle unarmed. It projects scarcely at all beyond the 

 second joint of the antennular peduncle. 



The copulatory appendages to the two first pairs of pleopoda (figs. 3, 4) difi"er some- 

 what in their structural details from those in Euplmusia pellucida. More especially in 

 the first pair, the diflerences are at once perceptible by comparing fig. 3 of this plate 

 with fig. 28 of PI. XII., the hook-shaped processes having a somewhat dissimilar form 

 in the two species. 



The telson (see fig. 5) is very slender, and distinguished from that in Eupliausia 

 jjellucida more particularly l)y the suljapical spines being much smaller and quite 

 smooth. 



As in the preceding species, the uropoda (ibid.) do not attain the length of the 

 telson ; and as regards the terminal plates — contrary to the relation in Euphcmsia 

 ■pellucida — the inner are appreciably shorter than the outer. 



Habitat. — The above described specimen was taken with the trawl, in the South 

 Atlantic, south-cast of Buenos Ayres, having in all probability been brought up from 

 some intermediate stratum of the sea during the hauling up. 



Station 320, February 14, 1876; lat. 37° 17' S., long. 53' 52' W. ; depth, 600 

 fathoms. 



16. Euphausia splendens, Dana (PL XIII. figs. 7-17). 



Eupliausia sjilenderis, Dana, United States Expl. Exped., vol. xiii., Crustacea, p. 642, pi. xlii. 



fig. 5, a~h. 

 Euphausia splendens, G. O. Sars, Preliminaiy Notices on the Challenger Schizo})oda, 



No. 1.5. 



Specifxi Characters. — Form of body somewhat more robust than in the last two 

 species. Carapace with a single denticle about the middle of the lower margin ; anterior 

 part slightly keeled above ; rostral projection remarkably short, scarcely projecting 

 beyond the ocular segment. Caudal segments smooth above ; epimera rather small and 

 evenly rounded. Last segment longer than preceding ; preanal s^^ine simple. Eyes 

 rather large, pyriform. Antennular peduncle without any trace of dorsal lobes, but with 

 a fascicle of very strong curved setse, springing from off the dorsal face of the basal joint. 

 Antennal scale nearly as in Euphausia p)Mucida; basal spine, however, much shorter. 

 Terminal joint of second pair of maxillse very large, and ovate in form. Subapical spines 

 of telson smooth. Inner plate of uropoda a little shorter than outer. Length reaching 

 18 mm. 



Remarks. — As the descriptions of Dana are anything but satisfactory', it is some- 

 what difficult to decide ^\'itli absolute certainty whether this form be in fact identical 



