498 PROCEEDINGS OF THE ACADEMY OF [1896. 



M. rorata Rve., Trypanostoma spilbnani Lea, T. moniliferum, lo 

 nodosa, lo variabilis, lo nobilis and lo robusia Lea. There are still 

 other forms which will doubtless fall under undulatum as varieties 

 or synonyms. 



79. Pleurocera undulatum nobile (Lea). 



Tennessee River, near Chattanooga (69317) ; Emory River, near 

 Harriman (69316). 



80. Pleurocera undulatum moniliferum (Lea). 



Aboriginal shell heaps, Williams Island, Tennessee River 



(69315). 



81. Pleurocera canaliculatum (Say). 



Clinch River, below Patton's Ferry (69368) ; Tennessee River, 

 near Knoxville (69264), 



82. Pleurocera gradatum (Anth.). 



Tennessee River, near Knoxville (69310) ; Holston River, 1 mile 

 above junction with French Broad (69309). 



83. Pleurocera filum (Lea). 



Tennessee River, near Chattanooga (69306) ; Emory River, near 

 Harriman (69308) ; Tennessee River, near Knoxville (69305). 



84. Pleurocera filum var ? 



South Harpeth River, 6 miles from Bellevue (69307). 

 86. Pleurocera sp. ? 



Patton's Ferry, Clinch River (69324). 



A peculiar species, not corresponding with any described form, 

 but it may be described in a much worn or truncated condition. 



86. Pleurocera cylindraceum (Lea). 



Emory River, near Harriman (69304.) 



It was described from Roane County. Trypanostoma roanense 

 Lea is a synonym of cylindraceum. 



87. Pleurocera hastatum (Anth.). 



Watauga River, below Watauga Station (69318). 



88. Pleurocera alveare (Con.). 



Clinch River, above Patton's Ferry (69311). 



89. Pleurocera unicale (Ilald.). 



Nolachucky, four and a half miles south of Greeneville (69319). 



90. Strephobasis lyonii Lea. 



Tennessee River, near Knoxville (69335) ; Holston River, 1 mile 

 above French Broad (69336). 



