406 Wisconsin Academy of Sciences, Arts, and Letters. 



The right endopodite is small, shorter than 

 the first segment of the exopodite, 

 Terminal segment of the right exopodite is 

 elongate, 

 Right endopodite rudimentary, left endopo- 

 dite 2-segmented, spatulate in form, . . . .spatulocrenatui —D.i''' 

 Terminal segment of right exopodite much 

 the broadest at the distal end, lateral 

 spine nearly terminal and straight, - 



left endopodite elongate conipeclatus ^ p ' ' 



Terminal hook of right exopodite falci- 

 form, lateral spine at the distal third 

 of the segment, second basal segment 

 of the right foot broad at the distal 

 end with process at the external distal ^ 



angle sanguineus - P ' 



Terminal segment of right exopodite of usu- 

 al length, 

 Lateral spine terminal. 

 Inner surface of left endopodite rugose, 



a very large species, stagnalis ^ O'l 



Segments of right foot short and broad, 

 terminal hook long and strongly 

 curved, lateral spine long and 



straight, saltillinus 



The right endopodite Is distinctly longer than ' -^ 



the first segment of the exopodite, 

 The first segment of the right exopodite has an 

 oblique ridge on its dorsal surface. 

 The first segment of the right exopodite has -i 



a transverse ridge, the lateral spine of the 

 terminal segment is about one-half as 



long as the segment, asymmetricVrS - P'' 



The first segment of the right exopodite has 

 two curved processes on its dorsal surface, 

 the lateral spine of the terminal segment 



equals or exceeds in length the segment, dorsmlis -6.1 



rhe first segment of the right exopodite does 



not have a transverse ridge on the dorsal i 



surface, s 



The lateral spine of the terminal segment of 



the right exopodite is terminal, the en- . 



dopodites are distinctly two-segmented, Bakeri —p-i 



The lateral spine is situated on the distal 

 third of the terminal segment of the right 

 exopodite, the right endopodite is indis- 



-pA 



