267 



the lake, but is outnumbered, in some beds at least, by both Laiupsilis 

 luteola and Unio gibboaufi. Its relative scarcity in some of the shore beds 

 is in part made up by its wider distribution in the deeper waters of the 

 lake than the others reach, and on its presence on the isolated bars, 

 where it was occasionally taken up by the dredge. 



On account of the great variability of Anodonta grandis and the 

 difficulty in distinguishing the various forms, particular attention was 

 paid to this species as found in the lake, and the lake specimens were com- 

 pared with numerous examples from the neighboring lakes and rivei. 

 No Anodontas were found in the Tippecanoe River near Lake Maxin- 

 kuckee Outlet, and we were therefore unable to compare our lake speci- 

 mens with the form that would be most interesting in this connection. 



The mussels of Tippecanoe Lake at the head of Tippecanoe River 

 were examined in this connection. Blatchley (Indiana Geological Report 

 for 1900, p. 190) has reported Anodonta grandis as common, and the 

 subspecies footiana as frequent in Tippecanoe Lake. The Anodontas 

 of that lake differ markedly both in the size and shape of the individuals 

 from those of Lake Maxinkuckee. The difference in size can be easily 

 explained by the more favorable conditions in Tippecanoe Lake. This 

 body of water is more fluviatile than Lake Maxinkuckee, being directly 

 connected with the Tippecanoe River, which is already a fairly lai-ge 

 stream when it leaves the lake, and the mussel beds of the lake and river 

 are continuous. The upper part of Tippecanoe Lake is exceptionally 

 favorable for Anodontas; the living mussels are large and abundant, 

 and the dead shells almost pave the bottom near shore, several dead 

 shells often being telescoped within each other. Some of the shells 

 reached a size not often surpassed in the neighboring rivers; one example 

 measuring 172.5 mm. long, 95 mm. high and 65 mm. in diameter. A 

 few were thickened with a tendency to form half pearls, or "blisters", 

 but most were thin. A number of the shells approached Anodonta cor- 

 indenta in general form, and one flattened, rounded shell resembled A. 

 snborbiculata. The Anodontas from other lakes of the Tippecanoe River 

 system, such as Center Lake and Eagle Lake near Warsaw, resemble 

 those of Lake Maxinkuckee, but are generally smaller and shorter. 



The Anodontas of Lake Maxinkuckee were also compared with those 

 of Yellow River a few miles to the north, and with the various lakes 



