98 



1IIE NAUTILUS. 



Circinaria concava Say. 

 Omphalina fuliginosa Griff. 



" inornata Say. 



Vitrina limpida Gld. 

 Vitrea cellaria Miill. 

 " hammonis Strom. 

 " indentata Say. 

 ' rhoadsi Pils. 

 Euconulus chersinus polygyratus 



Pils. 



Zonitoides nitida Miill. 

 ". arbor ea Say. 

 " minusculd Binn. 

 Gastrodonta intertexta Binn. 



" lie/era Say. 



Ayriolimax campestris Binn. 



" agrestis L. 



Philomycus carolinensis Bosc. 

 Ariou fasciatns Nils, (very 



abundant) 

 Pyramidula alternata Say. 



perspectiva Say. 

 " striatetta Anth. 



Helicodiscus lineatus Say. 

 Succinea retusa Lea. 



" " pcoriensis Wolf. 



" ovalis Say. 

 <k " var. (a striking 



form, apparently 

 new). 



" avara Say. 

 Lt'mnea reflex a Say. 



Lhnnea catascopium Say. 



" umbrosa Say. 



'* emarginata Say. 



" desidiosa Say. 



" palustris L. 



" humilis Say. 



'' cohimella Say. 



" owascoensis Baker. 

 Planorbis trivolvis Say. 



" binneyiTryon. 



" campanulatus Say. 



" bicarinatus Say. 



" deflectus Say. 



'' pnrvus Say. 



" exacutus Say. 

 Vcilvata (ricarinata Say. 

 Physa gyrina Say. 

 " srr^n Tapp. 

 " Integra Hald. 

 " heterostrjpha Say. 

 Aplexa hypnirum L. 



Ancylus rivularis Say. 

 Pisidium variabile Prime. 

 Sphserium striatinum Lam. 



" uccideiitale Prime. 



" simile Say. 



" fobale Prime. 



" stamineum Con. 

 Calyculina securis Prime. 



" transversa Say. 



" partumeia Say. 



NEW PISIDIA. 



BY V. STERKI. 



/Vs. superius n. sp. Mussel rather small, well inflated, ovoid in 

 outlines, rounded or subangular ; beaks rather posterior, broad, 

 rounded or somewhat flattened on top, projecting over the superior 



