238 Soiitlieru Cross. 



size to the penultimate limb. In the thoracic appendages, strictly 

 so-called, these proportions fail. In the last three limbs the carpus 

 shortens, and the meros is not only longer in proportion, but of equal 

 size in the three limbs. 



The pleopods are subequal in size and of uniform structure, with, 

 of course, the exception of the last. The coxa is very short, its 

 distal margin being very sinuous ; the basis is comparatively long 

 and stout. The exopodite is the largest, lanceolote, witli long 

 plumose setae on the distal one-third of the outer and two-thirds 

 of the inner margin. The endopodite is smaller, its distal portion 

 being more equally setose on lioth sides, and the inner margin bears 

 a long finger-like process about the middle of its length. 



The uropods are large, the basipodite is broad, and bears on its 

 rounded outer margin a row of plumose setae. The exopodite 

 reaches to tlie origin of the telsonic appendages, and very closely 

 resembles the antennal squame in structure. The endopodite is 

 about the same length, tapering, and has long plumose setae on 

 both sides. 



The telson is proportionately broad at the base ; about one quarter 

 of its length it tapers somewhat rapidly for a short distance, and then 

 very gradually. Between the distal half and the origin of the lateral 

 appendages are three teeth on either side. Beyond the third spine, 

 which is the largest, the telson tapers quickly, and then terminates 

 in a lanceolate manner. The appendages are a pair of large, some- 

 what outwardly curved blades. 



Some twenty to thirty specimens of this species were taken 

 between the ice-floes on January 13, 1899, in lat. 65*52°, long. 

 162 • 32° E. Temperature 31° Fahr. 



EUPHAUSIA AUSTKALIS. 



Body about forty-five millimetres in length from rostrum to 

 telson, and very stoutly built. 



In general anatomical details this species so closely resembles 

 the last that I was disposed to regard glacialis as the young of this 

 form. Close examination proves that the two forms seem distinct, 

 and it is only necessary here to call attention to the points of difference. 



The carapace is precisely similar, save that the rostrum is 

 narrower ; its base does not occupy the entire width of the carapace. 



First antenna. Occurs both as singular and plural. The lappet 

 at the distal extremity of the first joint is bi-lobed, and that at the 

 end of the second extends to half the length of the third joint. 



