444 Wisconsin Acadenii/ of Sciences^ Arts, and Letters. 



endopodite nearly equals in length the first segment of the outer 

 ramus. The two terminal spines are rather long, and the inner 

 margin of the tip is setose. 



The first basal segment of the i-ight fifth foot of the ijiale is 

 armed with a spine of moderate size. The second basal seg- 

 ment is quadrangular in form, its length being about twice its 

 width. The lateral hair is situated nearly at the distal end 

 of the segment, jSTear the distal end of the segment, on the 

 posterior surface, is a shelf-like projection, from which arises 

 a blunt hook which extends distally over the proximal end of 

 the first segment of the exopodite. The first segment of the ex- 

 opodite is quadrangular, about twice as long as wide. The sec- 

 ond segment of the exopodite is rather slender, its length being- 

 somewhat less than three times its width. The lateral spine is 

 short, and situated well towards the distal end of the segment. 

 The terminal hook equals in length the preceding segment, is 

 slightly curved, and is serrulate on its inner margin. The en- 

 dopodite is somewhat variable in length, sometimes being about 

 two-thirds the length of the? first segment of the exopodite, and 

 at others nearly equaling that segment. It is armed with fine 

 hairs at the tip. In the left fifth foot of the male, the spine of 

 the first basal segment and the lateral hair of the second are 

 situated as in the right foot. The length and width of the se<3ond 

 basal segment are about equal. The first segment of the ex- 

 opodite is about twice as long as wide, quadrangular in form,^ 

 with its inner distal angle setose. The second segment is irreg- 

 ular in form, about four times as long as Avide, setose on the 

 inner margiu. It is armed on the distal extremity with a fin- 

 ger-like process and a long, curved spine; this spine is setose. 

 The endopodite is slender, somewhat curved at its distal part, 

 and considerably longer than the first segment of the exopo- 

 dite. It is setose on the inner margin of the tip. 



Authors vary somewhat in regard to the length. In Forbes's 

 original paper, the average length is given as 1.778 mm., no 

 distinction being made as to sex. De Gueme and Richard give 

 the length as about 1.5 mm. Ilerrick and Turner give the 

 length' of the female as 1.5 to 1.7 mm., and that of the male as 



