2 University of Michigan 



meandering stream six to fifteen feet in ^vidth, seldom more 

 than three feet deep except in high water, and with a current 

 flowing at the rate of twenty-five feet per minute. In mid- 

 stream, the water here is practically free from vegetation, but 

 for a quarter of a mile from the lake both banks show a 

 profuse growth of water cress, together with small patches of 

 peppermint (Iinpaficiis hiflora), Scutellaria lateriflora. Iris 

 versicolor and Miimtlits jainesii. Close to the lake the banks 

 become impassablv boggy, with growths of cat-tail (Typha 

 latifolia), swamp loosestrife (Decodon verticillata') , Spargan- 

 ium and swamp dock (Rnmcx brittanica). The bottom of 

 the stream remains firm and sandy to its entrance into the 

 lake. 



Aphredoderus is not found in the upper portion of this 

 brook, where the water dashes over gravel — the habitat of 

 the rainbow darter (Poecilichthys cocntlens) . It is abundant 

 however, in the lower quieter course of the stream. Here 

 it is associated with an abundance of aquatic insects, amphi- 

 pods and snails, and with twenty-four other species of fishes. 

 These fishes are: Auiia calva, Catostomus commcrsonnii, 

 Erimyzon sitcceia, Piuicplwlcs notatiis, Scuiotilus atrouiacu- 

 latiis, Notcmigonns cr\solcucus, Notropis coruiitits, Nocouiis 

 kentiickiensis, Amciiints Jiatalis, Ameiurus nielas. Umbra limi, 

 Esox z'cruiiculafus^ Fundnlus notatus, Eucalia iuco)isfaus, 

 Labidesthcs sicciilus, Auibloplites rupcstris, Cliaowbrytfus 

 gulosiis, Lcponiis incisor^ Eupomotis gibbosus, Microptcriis 

 salmoides, Bnlcosonia nigrum, Poecilichthys iozcac, Poeci- 

 lichthys coendeiis, Microperca punctulata. 



The smaller tributary of Black Lake is three or four feet 

 deep in its lower course. It has here a miry bottom covered 

 in many i^laces with a growth of Chara and Rlodea, 



