4 Messrs. E. W. L. Holt a?id W. M. Tattcrsall on 



lateral margins with a single prominent denticle, just above 

 the insertion of the third thoracic limbs. Pleun without 

 dorsal ridges or spines, none of the pleural plates much pro- 

 duced ; sixth segment about one and a half times as long as 

 the hfth. Kyes globose and rather large, greatest diameter 

 exceeding half the length of the sixth segment of the pleon ; 

 pigment black. Antenniilar pi'dnnde "with the basal joint 

 much the wider and as long as the second and third com- 

 bined, and set on its distal half with about twelve curved 

 setae on a ridge terminating at the outer distal corner in a 

 short stout spine more or less overhung and concealed by 

 the setae fringing the outer distal edge; no lappet on any of 

 the joints. Antennal scah VQTichm^ to about the middle of 

 the third joint of the antennular peduncle, about three times 

 as long as broad ; outer margin terminating in a spine, 

 beyond which the apex is not produced. Telson about once 

 and a half as long as the sixth segment of the pleon ; apex 

 acutely pointed ; subapical spines extending for half their 

 length beyond tiie apex and set on their inner margins with 

 a few very minute spines ; dorsal denticles usually in two 

 pairs, the first about halfway tow ards, the second at the base 

 of, the subapical spines. Ui'opods, inner reaching to about 

 the insertion of the subapical spines, outer very slightly 

 longer, with a prominent denticle at its outer extremity. 



Length of the largest specimen 30 mm. 



E. crysiailo7'ophias is chiefly distinguishable from E. sj'/en- 

 dens, Sars, by its much longer and more acute rostrum. It 

 also lacks the lobe or lappet -of the inner angle of the distal 

 dorsal margin of the first joint of the antennular peduncle, 

 present in Sars'.s two types of E. splendens, but overlooked 

 in liis descriptions and figures *. 



!Mr. Hodg>on has favoured us with several thousand 

 specimens taken through holes cut in the ice. Not a single 

 specimen occurs in gatherings made in the open sea, and the 

 species appears to be, as we have endeavoured to indicate 

 in the specific name, exclusively a dweller beneath the roof 

 of ice. 



Euphausia triacantha, sp. n. 



Form moderately slender, slightly compressed. Carapace 

 with the anterior margin produced into a rather acute 

 rostrum nearly extending to the end of the basal joint of 



* This lobe is quite conspicuous, whether in dorsal or lateral view, in 

 the feujale type. In the male, which is considerably smaller, the lobe 

 ie less developed and not conspicuous in dorsal view. 



