NATURAL SCIENCES OF PHILADELPHIA. 109 



Anodonta edentula, Say. 

 Holston River. Scarce. 



CORBICULAD^E. 

 Sphaerium fabale, Prime. 



Turkey Creek, near Concord. Scarce. 

 Sphceriuni occidentale, Prime. 



Lyon's Bend, Knox County. 

 Pisidium abditum, Haldeman. 



Pond Spring, Monroe County ; Haskell's Spring, Knox County. 

 Pisidium compression, Prime. 



Pond Spring. Rare. 



Pisidium virginicum, Bgt. 



Turkey Creek, a few large single valves; Tellico River, more 

 abundant, not large. 



AQUATIC PULMONATES. 

 Lymnaea columella, Say. 



Sinking Creek. Abundant. 

 Lymnaea desidiosa, Say. 



Pond Spring. Abundant. Other localities, a few. 

 Lymnaea humilis ? Say. 



A single specimen was taken alive from a rock high up on a 

 bluff facing the Tennessee River in Roane County. It may have 

 strayed from a little spring of water trickling down the cliff a few 

 feet awa} r . 



Physa heterostropha, Say. 



Specimens are usually found in the various parcels of shells taken 

 from small streams and springs. 



Physa hypnorum, Drap. 



A single specimen. Station unknown. 



Planorbis bicarinatus, Say. 



A few small specimens from a lagoon near Chilhower Mountain 

 in Blount County. Larger specimens in Tellieo River. 



Planorbis parvus, Say. 



A few dead shells were sent for identification, taken from some 

 spring. Two specimens, evidently alive when taken, have been 



