98 



1 UK NAUTILUS. 



Qircinaria concava Say. 

 Omphalina fuliginosa Griff. 



" inornata Say. 



Vitrina limpida GUI. 

 VUrea cellaria Miill. 

 " hammonis Strom. 

 " indentata Say. 

 •' rhoadsi Pils. 

 Eucvaulus chersinus polygyratus 



Pils. 

 Zoniloidts nitida Miill. 

 " arborea Say. 

 " minuscula Binn. 

 Gastrodontu intertexta Binn. 



" ligera Say. 



Agriolimax campestris Binn. 



" agrestis L. 



Philomycus carolinensis Bosc. 

 .Arion fasciatas Nils, (very 



abundant). 

 Pyramidida alternata Say. 

 " perspectiva Say. 



" striatetta Anth. 



Helicodiscus lineatus Say. 

 Succinea retusa Lea. 



" " peoriensis Wolf. 



" ovalis Say. 



" " var. (a striking 



form, apparently 

 new). 

 " avara Say. 



Limnea reflexa Say. 



Limned catascopium Say. 

 umbrosa Say. 

 emarginata Say. 

 desidiosa Say. 

 palustris L. 

 humilis Say. 

 columella Say. 

 owascoensis Baker. 

 Planorbis trivolvis Say. 



" binneyiTryon. 

 campanidatvs Say. 

 bicarinatvs Say. 

 deflectus Say. 

 parvus Say. 

 exacutus Say. 

 Valvata tricarinata Say. 

 Physa gyrina Say. 

 " s«y?7 Tapp. 

 " inlegra Hald. 

 " heterostrjpha Say. 

 Aplexa hypnirum L. 



" " glabra DeKay. 



Ancylus rivularis Say. 

 Pisidium variabile Prime. 

 Spheerium striatinum Lam. 

 '** occidentale Prime. 

 " simile Say. 

 " fabale Prime. 

 " stamineum Con. 



Calyculina securis Prime. 

 " fra)isversa Say. 



" partumeia Say. 



NEW PISIDIA. 



BY V. STERKI. 



Pf's. 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 



