ECOLOGICAL STUDY OF DRY RUN 



115 



has been dammed up evidently to furnish a supply of drinking 

 water for stock. This makes a pool about a hundred yards long 

 and at its lower extremity seven feet wide and a yard deep. The 

 bottom of this pool is very soft black mud except for a stretch of 

 sand which appears at its head. The fishes found in this region 

 from Station 1 to Station 4 include Boleosoma nigrum Rafinesque, 

 the "johnny Darter"; Cauipostoina aitoiiialiim Rahnesciue, the 

 "Stone Lugger" or "Stone Roller" ; Soiiotilus atroiiiaculatus Mit- 



Fig. 14. — Mr. Peterson and laige Snapping Turtle caught in pond near head of 

 Dry Run. 



chill, the "Horned Dace" or "Creek Chub"; Pimephalcs promclas 

 Rafinesque, the "Flathead" or "Black-Head Minnow" ; Piniephales 

 notatits J^afinesque, the "Blunt-nosed Minnow"; Notropis gilherti 

 Jordan and Meek, "Gilbert's Minnow." In other words, all of 

 the species reported for the entire stream were found in this short 

 stretch of stream. The large spring mentioned contained an espe- 

 cially large number of specimens of Scmotilus, some of them being 

 at least nine inches in length. With the exception of Boleosoma and 

 Notropis, the other species were distributed quite uniformly through- 

 out the length of the region. Notropis was found only over the sand 

 stretch mentioned at the head of the backwater formed by the dam, 

 while Boleosoma was found here and for a short stretch above. It 



