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worthy of careful consideration. There are several species of fishes of 

 the Tippecanoe Eiver {Etheostoma camurum, Hadroptems evicles, Hy- 

 bopsis aniblops, etc.), which were not found either in the Outlet or in 

 the lakes, and other species {Hadropterus asjiro, Ericymha buccata, 

 Diplesion blennoides) which have pushed half way up the Outlet, but 

 were found no further up. 



In this connection, the mussel fauna of the Outlet is worthy of con- 

 sideration, and on various occasions, but especially on a trip down the 

 Outlet September 30, 1907, particular attention was paid to this feature. 



The Outlet is not particularly well suited to the growth and life of 

 mussels. The bottom is either a firm peaty soil or fine shifting sand; 

 moreover, the course has been artificially changed in some places and 

 the stream has naturally shortened its length in others by making 

 cutoffs. In addition to this the mussel fauna of such a narrow shallow 

 stream would be the prey of muskrats, minks, etc., the entire length 

 and width of the beds. 



On the trip mentioned above, abou.t a mile below Lost Lake a fine 

 example of Lampsilis iris was found. This is the farthest up stream 

 any species of mussel was obtained, and as this species is fairly common 

 in both lakes and abundant in the Tippecanoe River, we have here the 

 nearest approach to a continuous fauna. Some dead shells but no living 

 examples of Quadrula nnduJata were found a little farther down. 

 Farther down stream from a quarter to half a mile, a short distance 

 above the second cross-road south of the lake, was found a small mussel- 

 bed of about forty or fifty mussels, the great majority of which were 

 Quadrula undulata. A few living Lamrsilis iris, two dead Symphynofa 

 compressa, one living Symphynota costata (gravid) and a few dead 

 shells of Quadrula coccinea, complete the list. Below this point no mus- 

 sels were found until near where the Outlet joins the Tippecanoe. Here, 

 a few rods up the Outlet, a fair bed of Quadrula coccinea was found. 

 Of the five species of mussels found in the Outlet, only two, L. iris and 

 Q. coccinea, are found in the lake, the latter but rarely. The form and 

 general appearance of the Q. undulata of the Outlet is quite peculiar 

 and they can be picked out at once from collections from the various 

 rivers of the country. They are unusually elongate, in this respect 

 resembling some of the Tippecanoe mussels but differing from them in 



