NORTH AMERICAN CONCHOLOGY. 



331 



Planorbis campanulatus Say. 



executus Say. 



parvus Say. 



trivolvis Say. 

 Helix albolabris Say. 



alternata Say. 



arboria Say. 



chersina Say. 



concava Say. 



clausa Say. 



electrina Say. 



fallax Say. 



fraterna Say. 



fuliginosa Binney. 



hirsuta Say. 



hydrophila Ingalls. 



indentata Say. 



ligera Say. 



labyrinthica Say. 



limatula Ward. 



lineata Say. 



minuscula Binney 



Helix monodon Rae 



multilineata 



palliata Say. 



perspectiva Say. 



profunda. 



solitaria Say. 



striatella Anthony. 



thyroides Say. 



tridentata Say. 

 Succinea obliqua Say. 



avara Say. 



ovalis Gould. 



vermetus Say. 

 Bulimus fallax Gould. 

 Pupa contracta Say. 



armifera Say. 



pentodon Say. 

 Carychium exiguum Say. 

 Vertigo simplex Gould. 



G-ouldii Binney. 

 Achatina lubrica Mailer. 



Hildretii. — Catalogue of Fresh-water Shells found near Mari- 

 etta, Ohio: by S. P. Hildreth. 



[No date, paging, or descriptions. — W. G. B.] 



Alasmodonta complanata Bar. 

 Unio plicatus Say. 

 ellipticus Barnt s. 



siliquoideus Barnes. 

 anodontoides Lea. 



rectus Lam. 



ovatus Say. 



alattis Say. 

 Alasmodonta rugosa Barnes. 

 Cyclas similis Say. 

 Unio heros Say. 



tuberculatus Barnes. 



verrucosus Barms. 



pustulatus L^ea. 



pustulosus Lea. 



metanevrus R if. 



cornutus Harms. 



rugosus Barnes. 



perplexus Lea. 



Unio irroratus Lea. 

 cylindricus Say. 

 torsus Raf. 

 pyramidatus Lea. 

 undatus Barnes. 

 mytiloides Raf. 

 trigonus Lea. 

 scalenius Raf. 

 cuneatus Barnes. 

 niger Raf. 

 phaseolus ILildreth. 

 ellipsis Lea. 

 foliatus Hildreth. 

 securis Ze«. 

 abruptus Say. 

 gibbosus Barnes. 

 elegans L< a. 

 multiradiatus Lea. 

 planus Barnes. 



