Copepoda Found in the Vicinity of Lincoln, Nebraska. 



137 



smooth seta at the outer side. The second joint bears four 

 small setae and one long one. 



The species is widely distributed and fairly abundant, 

 though a little hard to obtain — as when the Birge net is 

 drawn close enough to the ground to get the forms, a large 

 proportion of dirt is obtained. They prefer marshy ponds, 

 and only once — at Louisville — have I found them in any clear 

 deep water. 



Canthocamptus iixinoisensis Forbes. 



One specimen, which was identified as this species, was 

 found near Saltillo. When a second examination to obtain 

 more was made the pond had dried. The drawings made and 

 all appearances agreed with the description given by Forbes, 

 but the species can hardly be reviewed from a single specimen. 



EXPLANATION OF PLATE VII. 



1. — Diaptomus nebraskensis , . . 



...Antenna of male 



. X 216 



2. — " " 





• X 376 



3.— 



" " male. . . . 



. X 216 



4.— 



Abdomen of female. . 



. X 108 



5. — " saltillinus 



. . .Fifth foot of male. . . . 



• X 216 



6.— 



. . .Antenna of male 



• X 376 



7.— 



.. Abdomen of female.. 



. X 108 



8.— 



Fifth foot of female. . 



• X 376 



9. — " eiseni 



. . .Fifth foot of male. . . . 



. X 108 



10. — " " 



. . .Antenna of male 



. X 216 



11. — " " 



Fifth foot of female.. 



. X 108 



12. — " " 





. X 60 



19 



