THE NAUTILUS. 
13: 
LAND AND FRESH-WATER SHELLS OF ALLEGHENY COUNTY, PA. 
COLLECTED BY Ss. 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 aiternata Say. 
Patula solitaria Say. 
Patula perspectiva Say. 
Patula striatella Anthony. 
Punctum pygmeum minutissi- | 
mum Lea. 
Selenites concavus Say. 
Mesomphix fulginosus Griff. 
Mesomphix ligerus Say. 
Mesomphix intertextus Binn. 
Mesomphix inornatus Say. 
Hyalina arborea Say. 
Hyalina indentata Say. 
Hyalina minuscula Binn. 
Hyalina milium Morse. 
Hyalina radiatula Alder. 
Hyalina wheatleyi Bld. 
Conulus fulyus Drap. 
Gastrodonta multidentata Binn. 
Ferussacia subcylindrica Linn. 
Leucocheila contracta Say. 
Leucocheila armifera Say. 
Vertigo ovataSay. &@ 
Vertigo pentodon Say. 
Vertigo milium Gld. 
Succinea avara Say. 
Limneza columella Say. 
Limnea humilis Say. 
Limneea palustris Mull. 
Limneea desidiosa Say. 
Planorbis bicarinatus Say. 
Carychium exile Lea. 
Carychium exiguumay. 
Helicina occulta Say. 
Physa heterostropha Say. 
Ancylus fuscus Adams. 
Spherium striatinum 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. 
1 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 Unionidz 
and Strepomatidz in the headwaters of that river system.—EpD. NAUTILUS. 
