46 



THE MUSEUM. 



phase of lo. In habits the animals, 

 so far as is known, are somewhat sim- 

 ilar to each other, with this difference, 

 that Angitrema is fitted to dwell in 

 more quiet waters than the necessities 

 of lo require. 



Taken in another aspect, the in- 

 quiry why lo should be confined ap- 

 parently to the head-waters of the 

 Tennesee River can be answered (in 

 the proverbial Yankee style) by offer- 

 ing the inquiry why a curious group of 

 shells with a fissured lip should be 

 found only in the Coosa River in Ala- 

 bama. This, like much more that 

 might be made the subject of inquiry, 

 is a part of the unwritten history of lo 

 that remains to be investigated. 



The reader who may desire to refer 

 to a summary of what has been writ- 

 ten on species of lo will find such in- 

 formation as is a ailable for the pur- 

 poses of a naturb ist in a work entitled 

 Strepomatidffi, by G. W. Tyron, Jr., 

 Smithsonian Miscellaneous Collections 

 No. 253. 



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Flora of the Vpper Susqueliamia: -The 

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THE MUSEUM. 



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