

 mouth organ* at various stages confirms the iil-ntitiuation of the specimens with E. 



This brief rtswmi of the development, 1 think, justifies the view that E. 

 (intarcHca and E. jlacialis represent stages in the development of E. mtjtfrba, and must 

 therefore be regarded as synonymous with that special. 



It should be- mentioned that Hodgson's types of E. australi* differ in no way from 

 E. superlxi (females), except in being considerably damaged. 



EUPHAUSIA CRYSTALLOROPHIAS. 



(Plate II., Figs. 1-10 ; Plate IV., Fig. 10.) 

 Euiikaiuia rryttallorophuu, Holt and TiUU-nwll, 1900 (1). 

 Localities of Captures : 

 Winter Quarters. 



26. 1. 02-8. 3. 02, 1 specimen, 24 mm. 



,, ,, 216 specimens, larval. 



No. 3 Hole, 52 specimens, larval to 25 mm. 

 No. 4 Hole, 4572 specimens, larval to 32 mm. 

 No. 6 Hole, 13 specimens, larval to 25 mm. 

 No. 8 Hole, 4642 specimens, larval to 32 mm. 

 No. 13 Hole, 50 specimens, larval. 



No specimens were captured either on the outward or homeward journey. 



Form, moderately robust 



Carapace (Plate II., Figs. 1 and 2), with a prominent, rather long and acute 

 spine on its lateral margins, a little anterior to the middle, and just alx>ve the 

 insertion of the second thoracic limb ; nritero-lateral angles terminating in an 

 acute spine ; anterior margins inflated alove the eyestalks and produced into a long 

 acute rostrum extending to the visual part of the eye and about half-way along the 

 lsal joint of the antennular peduncle ; there is a faint gastro-hepatic groove and 

 a distinct keel runs forward medio-dorsally from the latter into the rostrum. 



Pli-im (Plate II., Fig. 1) without ridges or dorsal spines; none of the epimerel 

 plates much produced ; sixth segment about one and a half times as long as the 

 fifth ; preanal spine well developed and usually simple, but in large examples bifid. 



Eyes (Plate II., Fig. 1) globose and rather large; greatest diameter of the 

 cornea exceeding half the length of the last pleon segment ; pigment black. 



Antennulai- pedunck (Plate II., Fig. 2), with the basal joint as long as the second 

 and third joints combined and much wider ; no lota or lappet ; a row of altout 

 twelve long curved plumose setie set en a ridge on the distal part of its length ; 

 a short stout spine on the outer distal corner, which is more or less concealed by 

 the numerous seta- which arm the outer half of the anterior margin and the distal 



