3i6 



THOMAS J. HEADLEE. 



shores of the lake and even in deep water but, in spite of con- 

 siderable search, we found no live specimens. The shells of Pisid- 

 ium iiHzquilatei'ale Prime were also found, although less abund- 

 antly, but neither were live specimens of it taken. Neither of these 

 has before been reported from this region and the latter, not 

 from Indiana. 



A B C 



FlG. 2. A, left and right valves of Pisidium inaquilaterale (dorso-ventral diame- 

 ter of original is .19 in.) ; B, left and right valves of Sphanum partiimeitim (dorso- 

 ventral diafheter is .29 in.) ; C, left and right valves of SpJuErintn striatinum (dorso- 

 ventral diameter of original left valve is .27 in., while that of the original right valve 

 is .29 in.). 



In conclusion, I wish to acknowledge my indebtedness to 

 Prof. C. H. Eigenmann under whose direction this work was 

 done, and to R. Ellsworth Call, who kindly identified the three 

 last-mentioned species. 



