Euphaiisiidæ. 35 



sharply-defined segments, and of 2 small terminal appendages, 

 the inner of which answers to the palp in the maxillæ, the 

 outer to the exognath. The proximal segment of the basal 

 part forms a broadly rounded expansion inside, clothed with 

 several densely ciliated setæ, and on the inner edge of the 

 distal segment 5 similar setæ occur, and also a short 

 spine issuing just behind the distal seta. The terminal 

 appendages are both biarticulate; but the proximal joint of 

 the inner one, or the palp, is still imperfectly defined from 

 the basal part. It carries 2 small bristles inside, and a 

 short incurved spine. The distal joint of this appendage 

 is oval in form, and carries on the tip 4 curved setæ. 

 The outer appendage, which in the adult animal is de- 

 veloped into the natatory ramus, is about the size of the 

 inner, and has the proximal joint quite short, with a small 

 bristle outside. The distal joint is narrow oblong, and 

 exhibits in its outermost part traces of a subdivision into 

 short articulations. It carries 5 setæ, one of which is 

 rather small, and attached outside at a short distance from 

 the tip. 



Behind the above-described limbs, which all belong to 

 the cephalic division, there are no other appendages as yet 

 developed, though, as above stated, a slight projection 

 immediately behind the maxillipeds indicates the place 

 where the 1st pair of thoracic appendages (legs) will de- 

 velop themselves. Nor can as yet, any trace of pleopoda 

 be detected. The last segment of the metasome has, how- 

 ever, given origin to a pair of appendages partly concealed 

 below the basal part of the telson. 



These appendages (see fig. 12) represent the uropoda, 

 which in the adult animal together with the telson form the 



