THE NAUTILUS. 135 



LAND AND FRESH-WATER SHELLS OF ALLEGHENY COUNTY, PA. 



COLLECTED BY S. H. STUPAKOFF OF PITTSBURGH, PA., 

 FROM JAN., 1890 TO DEC, 1893.^ 



Mesodon albolabris Say. 

 Mesodon var. dentata Binn. 

 Mesodon dentifera Binn. 

 Mesodon profunda Say. 

 Mesodon pennsylvanica Green. 

 Mesodon thyroides Say. 

 Mesodon exoleta Binn. 

 Triodopsis tridentata Say. 

 Triodopsis palliata Say, 

 Triodopsis fallax Say. 

 Stenotrema monodon Rack. 

 Stenotrema var. fraterna Say. 

 Stenotrema hirsuta Say. 

 Helicodiscus lineata Say. 

 Vallonia pulchella Mull. 

 Vallonia excentrica Sterki. 

 Patula alternata Say. 

 Patula solitaria Say. 

 Patula perspectiva Say. 

 Patula striatella Anthony. 

 Punctual pygmseum minutissi- 



mum Lea. 

 Selenites concavus Say. 

 Mesomphix fulginosus Griff. 

 Mesomphix ligerus Say. 

 Mesomphix iiitertextus Binn. 

 Mesomphix inornatus Say. 

 Hyalina arborea Say. 

 Hyalina indentata Say. 

 Hyalina niinuscula Binn. 

 Hyalina milium Morse. 

 Hyalina radiatula Alder. 



Hyalina wheatleyi Bid. 

 Conulus fulvus Drap. 

 Gastrodonta raultidentata Binn. 

 Ferussacia subcylindrica Linn. 

 Leucocheila contracta Say. 

 Leucocheila armifera Say. 

 Vertigo ovata Say. 

 Vertigo pentodon Say. 

 Vertigo milium Gld. 

 Succinea avara Say. 

 Limniea columella Say. 

 Limnsea humilis Say. 

 Limn?ea palustris Miill. 

 Limnsea desidiosa Say. 

 Planorbis bicarinatus Say. 

 Carychium exile Lea. 

 Carychiura exiguum Say. 

 Helicina occulta Say. 

 Physa heterostropha Say. 

 Ancylus fuscus Adams. 

 Sphserium striatiuum Lam. 

 Pisidium ? 



Goniobasis ? 

 Margaritana rugosa Barnes. 

 Unio ligamentinus Lam. 

 Unio gibbosus Barnes. 

 Unio ellipsis Lea. 

 Unio cariosus Say. 

 Unio pyramidatus Lea. 

 Unio trigonus Lea. 

 Unio alatus Lea. 



' The present list is the first essay toward a knowledge of the snail fauna of 

 western Pennsylvania. The region is an interesting one, combining the features 

 of the Atlantic slope and the Ohio valley; and it is desirable to have a complete 

 and accurate catalogue of the fauna. The fresh-water fauna will prove especially 

 interesting, as we know little of the range of the Ohio River types of Unionidae 

 and Strepomatidse in the headwaters of that river system. — Ed. Nautilus. 



