136 



DISCOVERY REPORTS 



those of a specimen with cirri of long segments. The cirrus Ui is of 52 segments and is 

 nearly 75 mm. long. The first three segments are short, the fourth is longer than broad ; 

 the fifth and sixth are nearly twice as long as broad, the seventh to about the twentieth 

 or twenty-fifth twice as long as broad. The remainder gradually decrease in length until 

 the most distal are as broad as long. In the segments following the first ten or so the 

 distal edge projects slightly on the dorsal side ; the projection is most marked, but not 



Oo 



Fig. I. Piomachociiims kcrguelensis. aj_2, long and short cirri of a specimen with cirri of short segments, 

 X 1-25. a3_4, the same of a specimen with cirri of long segments, x 1-25. b, distal segments of a short cirrus, 

 X9. 



Strong, in the distal segments. All but the basal segments are compressed from side to 

 side, the distal most strongly. 



The small apical cirrus of the same specimen, a, , is of 24 segments and 1 5 mm. long. 

 The basal segments, the first two or three, are broader than long; the proximal are 

 longer than broad but not nearly so much so as in the long cirri. The distal segments are 

 as broad as long and have the dorsal projection more strongly developed and more keel- 

 like than do those of the larger cirri. 



The more elongated cirrus, from another specimen, shown in Fig. i (jg, is of 51 seg- 

 ments and nearly 100 mm. long. The first two segments are broader than long, the third 



