452 Wisconsin Academy of Sciences^ Arts, and Letters. 



is strongly denticulate on the inner margin and less so on the 

 outer. It is armed with three spines. The inner two are 

 upon a distinct base, which represents the third segment. 

 These two spines are pectinate, and the inner is considerably 

 the longer. The endopodite is slender, about equal in length 

 to the first segment of the exopodite. It is setose at tip and 

 armed with two long pliunose spines. 



The spines of the first basal segments of the male fifth feet 

 are small and acute. The second basal segment of the right 

 foot is quadrate, with the lateral hair situated near the distal 

 angle. Upon its posterior surface near the inner distal angle 

 is a short hook-like process. On the inner margin at a little 

 less than half its length is a small conical process. From the 

 middle of the posterior surface near the distal end arises a 

 stout falciform process which nearly equals in length the first 

 segment of the exopodite. The first segment of the right exo- 

 podite is equal in length to the second basal se.xnient. It is 

 arcuate, the inner surface being concave and the outer convex. 

 The second segment is longer than the first, quadrangular, and 

 has the lateral spine at the outer distal angle. The terminal 

 hook is rather stout, falciform, siymmetrically curved, and equal 

 in length to the segments of the exopodite. The inner margin 

 is markedly denticulate. The endopodite springs from the 

 inner margin of the second basal segment. It nearly equals 

 one-half the length of the first segment of the exopodite. It is 

 setose at tip. 



The left foot reaches to the end of the first segment of the 

 right exopodite. The second basal segment is trapezoidal in 

 form, as wide as long, and has the lateral hair near the distal 

 angle. The first segment of the exopodite is longer than wide 

 and setose on the inner distal angle. The second segment of 

 the exopodite is long and slender, arising from the outer half 

 of the distal end of the preceding segment. Its margins are 

 slightly concave, and the inner margin is setose. It is termi- 

 nated by a digitiform process and a stout spine. This spine is 

 armed on its inner surface with stout spinules. The endopo- 

 dite is long and slender, reaching one-half the length of the 



