THE NAUTILUS. 



65 



Helicina orbiculata tropica Jan. 

 Praticolella berlandieriana Mor- 



icand. 



Praticolella griseola Pfr. 

 Polygyra dorfeuilliana Lea. 

 Polygyra dorfeuilliana sampsoni 



Weth. 



Polygyra mooreana W. G. B. 

 Polygyra texasiana Mori can d. 

 Polygyra roemeri Pfr. 

 Polygyra monodon fraterna Say. 

 Bulimulus dealbatus liquabilus 



Rve. 

 Bilimulus dealbatus mooreanus 



Pfr. 

 Bulimulus dealbatus schiedi- 



anus Pfr. 



Strobilops labyrinthica texasi- 

 ana P. & F. 



Pupoides marginatus Say. 

 Bifidaria armifera Say. 

 Bifidaria contracta Say. 

 Bifidaria tappaniana C. B. Ad. 

 Bifidaria pentodon Say. 

 Bifidaria procera cristata P.& F. 

 Bifidaria pellucida hordeacella 



Pils. 



Vitrea sculptilis Bland. 

 Vitrea indentata Say. 

 Vitrea indentata umbilicata 



Singley. 



Vitrea dalliana roemeri P. & F. 

 Euconulus fulvus Mull. 

 'Euconulus chersinus trochulus 



Reinh. 



Zonitoides arboreus Say. 

 Zonitoides minusculus Binn. 

 Zonitoides singleyanus Pils. 

 Limax flavus Linn. 

 Philomycus carolinensis Bosc. 



Pyramidula alternata Say. 



Helicodiscus eigenmanni P. & F. 



Punctum pygmoeuni Drap. 



Succinea avara Say. 



Carychium exile II. C. Lea. 



Planorbis bicarinatus Say. 



Planorbis liebmanni Pfr. 



Planorbis parvus Say. 



Planorbis trivolvis Say. 



Planorbis tumidus Pfr. 



Physa mexicana Ph. 



Physa mexicana conoidea C.& F. 



Physa forsheyi Lea. 



Physa rhomboidea Crandall. 



Physa osculans Hald. 



Amnicola peracuta P. & W. 



Lymnaea desidiosa Say. (Variety?) 



Lymnaea bulimoides techella Hald. 



Calyculina transversa Say. 



Tritogonia tuberculata Barnes. 



Quadrula forsheyi Lea. 



Quadrula aurea Lea. 



Quadrula pustulosa Lea. (Smooth 

 variety.) 



Anodonta imbecilis Say. 



Lampsilis gracilis Barnes. 



Lampsilis purpuratus Lamarck. 

 (Variety.) 



Lampsilis berlandieri Lea. 



Lampsilis berlandieri Lea. (Va- 

 riety.) 



Lampsilis anodontoides Say. 



Lampsilis parvus Barnes. 



Lampsilis texasensis Lea. 



Lampsilis ventricosus satur Lea. 



Lampsilis laevissimus Lea. 



Plagiola macrodon Lea. 



Unio tetralasmus Say. 



Unio tetralasmus manubius Say. 



Unio tetralasmus camptodon Say. 



