rilE NAUTILUS. 67 



Pelecypoda. 

 Lampsilis ventricosa (Barnes), Station 2, rare. 

 Lampsilis radiata (Dilhvyn). Stations 1, 2, common. 

 Anodonta murginuta (Say). Station 2, common. 

 Unio nasittus (Say). Stations 1, 2, common. 

 Unto complanatus (Solander). Stations 1, 2, common. 



Gastkopoda. 



Campeloma decisum (Say). Station 6, rare. 

 Campeloma integrum ohesum (Lewis). Stations 2, 3, rare. 

 Valvata lewisii (Currier). Station 2, rare. 

 Bythinia tentaculata (Linn.), Station 5, common. 

 Goniohasis livescens (Menke). Stations 2, 6, common, 

 Physa gyrina (Say). Station 5, common. 

 Planorhis trivolvis (Say). Stations 2, 4, 6, common. 

 Planorbis hinneyi (Tryon). Station 2, common. 

 Planorhis hicarinatus (Say). Station 2, common. 

 Planorhis campanidatus (Say). Stations 2, 4, 6, common. 

 Planorhis parvus i^-Ay^. Station 5, rare. 

 Planorhis hirsutus (Gould). Station 5, common. 

 Segmentina armigera (Say). Stations 2, 6, common. 

 Lymnsea stagnalis cpjiressa (Say). Stations 2, 3, common. 

 Galha palustris (Miiller). Stations 2, 5, 6, common. 

 Sirohilops lahyrinthica (Say). Station 4, not common. 

 Bijidaria contracto (Say). Station 5, common. 

 Succinea ovalis (Say). Station 5, common. 

 Succinea retusa (Lea). Stations 4, 5, common. 

 Polygyra tridentata (Say). Station 5. common. 

 Polygyra albolahris (Say). Station 5, common. 

 Polygyra fraterna (Say). Stations 4, .5, common. 

 Circinaria concava (Say). Station 4, not common. 

 Vitrea hammonis (Strom). Stations 4, 5, common. 

 Vitrea indeiitata (Say). Station 5, common. 

 Euconuhis fulvus (Mull). Station 4, rare. 

 Zonitoides arboreus (Say). Stations 4, 5, common. 

 Agriolimax cainpestris (Binney). Station 5, common. 

 Phiiomycus carolinensis (Bosc). Station 5, rare. 

 Pyromidula alternntn (Say). Stations 4, 5, common. 

 Helicodiscus paruUelus (Say). Station 4, common. 



