SCHIZOPODA. 9 



mouth organs at various stages confirms the identification of the specimens with E. 

 superba. 



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

 antarctica and E. glacialis represent stages in the development of E. superba, and must 

 therefore be regarded as synonymous with that species. 



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

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



EUPHAUSIA CRYSTALLOROPHIAS. 



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

 Euphausla crystallorophias, Holt and Tattersnll, 1906 (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. 18 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 above the 

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

 acute spine ; anterior margins inflated above the eyes talks and produced into a long 

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

 basal 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. 



Pleon (Plate II., Fig. 1) without ridges or dorsal spines; none of the epimeral 

 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. 



Antennular peduncle (Plate IL, Fig. 2), with the basal joint as long as the second 

 and third joints combined and much wider ; no lobe ' or lappet ; a row of about 

 twelve long curved plumose setse set on 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 setae which arm the outer half of the anterior margin and the distal 



