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Copepoda Found in the Vicinity of Lincoln, Nebraska. 119 



ARTICLE XIII. — A STUDY OF THE COPEPODA 

 FOUND IN THE VICINITY OF LINCOLN, NE- 

 BRASKA * 



By Albert D. Brewer, A. M. 



This study has been thorough only for the spring months 

 and for the immediate vicinity of Lincoln, but includes some 

 forms found at neighboring places in the state. While many 

 collections were made earlier than March, they have been 

 almost entirely neglected, as the collecting apparatus was 

 inadequate to thorough exploration, so that the earlier collec- 

 tions are referred to in one or two instances only. The aim 

 of my study, after identifying the known species and describ- 

 ing two new ones, has been to determine the habitat of the 

 forms present here ; unfortunately the results in that line are 

 mainly negative. 



The table made to show the occurrence does not by any 

 means represent all of the examinations made, but only the 

 more typical and important ones. Other places than those 

 given will have to be referred to occasionally, however. It 

 will be noticed that the faunas of ponds, located but a short 

 distance apart and apparently similar, differ materially in the 

 species present. 



Considering the small locality and limited time during 

 which collections were made, the variety of Copepoda seems 

 to be up to the average. It is deficient in species of Cyclops, 

 but has a large group of Diaptomi. In the latter genus, and 

 to some extent in Cyclops, the prevalent forms are those com- 

 mon to stagnant or temporary pools. This is fully justified 

 by the number of such pools found all along the bottoms of 

 Salt Creek and its tributaries during the spring and early 

 summer. 



The largest lakes examined were not large enough or deep 

 enough to show a different copepod fauna at their center 

 from that found at the edge, or essentially different from that 

 of the smallest roadside puddle. I suppose this lack of a 

 distinctive pelagic or littoral fauna is due to the fact that all 



* Studies from the Zoological Laboratory, The University of Nebraska, Lincoln, 

 under the direction of Henry B. Ward, No. 29. 



(Jour. Cin. Soc. Nat. Hist., Vol. XIX, No. 4.) 1 



Printed July 26, 1898. 



