436 Wisconsi7i Academy of Sciences, Arts, and Letters. 



eral dilatations are situated at the distal third of the segment, 

 and each lobe bears two small spines. The second segment is 

 very short, and is nearly concealed by the first. The third seg- 

 ment and the fiirca are about equal in length. The furcal rami 

 are ciliate on both the inner and outer margins. 



The antennae are 25-segmented and extend beyond the furcal 

 rami. The right antenna of the male is much swollen anterior 

 to the geniculating joint; the antepenultimate segment is pro- 

 duced on its distal end into a short, blunt process, which makes 

 very nearly a riglit angle with the longitudinal axis of the seg- 

 ment. 



In the female fifth feet, each of the first basal segments is 

 armed on the posterior surface with a very strong tooth-like pro- 

 jection in place of the customary spine. The lateral hair of 

 the second basal segment is rather stout. The length of the 

 first segment of the exopodite is twice its breadth. The hook 

 of the second segment is strongly curved, and is denticulate on 

 its inner margin. The third segment is represented by two 

 spines ; these spines arc unusually long. The endopodite is 

 slender and somewhat longer than the first segment of the ex- 

 opodite. Its tip is setose, and armed on the inner side with 

 two long, slender spines. 



In the fifth feet of the male, each of the first basal segments 

 is armed on its posterior surface with a strong tooth-like process 

 in addition to the customary spines. The second basal segment 

 of the right foot is longer than broad. On the posterior distal 

 surface near the inner margin is a small hyaline process. The 

 first segment of the exopodite is quadrate; it is prolonged 

 slightly on its outer distal angle, and on its posterior surface 

 near the inner margin bears a broad quadrate hyaline process, 

 whose length nearly equals that of the segment. The second 

 segment of the exopodite is twice the length of the first, is broad 

 at the proximal end, and narrow at the distal end. The proximal 

 end is nearly three times as broad as the distal. The lateral spine 

 is situated at the proximal third, is long, strongly curved, and 

 serrulate on its inner margin ; its length about ecpals the length 

 of the segment. The terminal hook is as long as the rest of the 

 right foot. It is slender, strongly curved, slightly angular, and 



