395 



The Pauista or a Solution Pond. 



By Will Scott. 



Page 



Introduction 395 



The Pond — 



Location 396 



Formation 396 



Destruction 401 



Methods 402 



Faunal List 405 



Plankton List 419 



Ecological Relations — 



(a) of the fauna to similar habitats (migration) 420 



(b) of the fauna to this habitat 



Level 424 



Temperature 427 



Light 432 



(c) of the species to each other- 



Food Relations 432 



Relation to Lakes and Rivers 437 



Relation to Cave Plankton 439 



Unsolved Problems 440 



Bibliography 440 



INTKODUCTION. 



In 1909 I gave an account of the plankton of the subterranean stream 

 in the caves of Indiana University's cave farm. Among other things it was 

 found that the plankton is comix)sed of epigean forms and is derived from 

 ponds in such sink-holes as have an opening above their lowest points. A 

 study of the fauna of the ponds furnishing the cave plankton became 

 desirable. 



'Contribution from the Zoijiogical Laboratory of Indiana University No. 119. 



