482 Wisconsin Academy of Sciences, Arts, and Letters. 



segment is very short, and the third and the fiirca are nearly 

 equal in length. The furcal rami are ciliate on both inner 

 and outer margins. 



The antennae are 25-segmented, and in the female reach the 

 lateral processes of the first abdominal segment. The ante- 

 penultimate segment of the right male antenna has a long, re- 

 curved, acuminate process, which reaches about to the end of 

 the antenna. 



In the fifth foot of the female, the first segment of the exo- 

 podite is twice as long as wide. The second segment is pro- 

 longed into the customary hook. This segment bears a spine 

 at its outer angle and is denticulate on its inner margin. The 

 third segment is distinct and bears two strong spines, of which 

 the inner is longer and is serrate on its margins. 



The endopodite nearly equals in length the first segment of 

 the exopodite, is indistinctly two-segmented, is setose at tip, 

 and bears two rather long spines. 



In the fifth feet of the male, the spines of the first basal seg- 

 ments are rather small. The second basal segment of the 

 right foot is wider than long, has a peculiar rugose expansion 

 of the inner margin, and bears the lateral hair at about two- 

 thirds of its length. The first segment of the exopodite is short, 

 its length being less than its breadth. It is produced on the 

 outer distal angle, and bears a small tubercle en the inner 

 margin near the distal end. The second segment is twice as 

 long as broad, convex on the outer margin, and concave on the 

 inner. The lateral spine is placed near the outer distal angle 

 and is serrate on the inner side. The terminal hook is about 

 as long as the whole right foot exclusive of the first basal seg- 

 ment ; it is abruptly bent at somewhat less than half its length, 

 making very nearly a right angle. The inner margin is den- 

 tate. The endopodite is slender, indistinctly two-segmented, 

 and once and a half as long as the first segment of the exopo- 

 dite. The left foot reaches nearly to one-half the length of 

 the second segment of the right exopodite. The second basal 

 segment is as long as wide, with the lateral hair placed near 

 the distal end. The first segment of the exopodite is twice as 



