66 THE NAUTILUS. 



Vitrea hammonis (Strom). Choptank River, just below Cboptank 

 Mills (one mile east of Henderson, Maryland), Kent Co. 



Vitrea indentata (Say). Chop tank River, just below Choptank 

 Mills (one mile east of Henderson, Maryland), Kent Co. Also 

 Brandywine valley between Duponts and Rockland, and near Dela- 

 ware City. 



Zonitoides arboreus (Say). Choptank River, just below Chop- 

 tank Mills, Kent Co.: Brandywine valley between Duponts and 

 Rockland ; Mt. Cuba and southwest side of Brandywine hills, just 

 below Pennsylvania State line (W. Stone !), near Delaware City ; 

 cnear Dover, Kent Co., and Seaford, Sussex Co. 



Gastrodonta ligera (Say). Brandywine valley between Duponts 

 and Rockland. 



Gnstrodonta suppressa (Say). Brandywine valley between Du- 

 ponts and Rockland. Southwest side Brandywine hills, just below 

 Paline and Mt. Cuba (W. Stone !); also near Delaware City. 



Philomycus carolinensis (Bosc.). Mt. Cuba (W. Stone !), Brandy- 

 wine valley between Duponts and Rockland. 



Pyramidula ulternuta fergusoni (Bid.). Brandywine valley be- 

 tween Duponts and Rockland. 



Lymncea^ humilis (Say). Near Delaware City; between Du- 

 pont's Powder Mill and Rockland. 



Lymnaa desidiosa (Say). Brandywine river between Duponts 

 and Rockland. 



Lymnsea columeUa (Say). Brandywine river between Duponts 

 and Rockland ; Seaford, Sussex Co. 



Planorbis bicarinatus (Say). Brandywine river between Duponts 

 and Rockland. 



Physa heterostropha (Say). Brandywine river between Duponts 

 and Rockland ; Seaford, Sussex Co.; head of Red Clay creek, 

 Christiana township. 



Goniobasis virginica (Gmel.). Brandywine River between 

 Dupont's Powder Mill and Rockland ; also Seaford, Sussex Co., 

 Delaware. 



Sphaerium sp. Head of Red Clay Creek, Christiana Township, 

 Delaware. 



1 The original orthography of this name is, here restored. American authors 

 have almost universally spelled it Liinnsea. H. A. P. 



