KORTH AxMERICAN 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. 



Mrsuta Say. 



hydrophila Ingalls. 



indentata Say. 



ligera Soy. 



labyrinthica Say. 



limatula Ward. 



lineata Say. 



minuscula Binney 



Helix mono don Rachett. 



multilineata Say. 



palliata Say. 



perspectiva Say. 



profunda, 



solitaria Say. 



striatella Antlwny. 



thyroides Say. 



tridentata Say. 

 Succinea obliqua Say. 



avara Say. 



ovalis Gould. 



vermetus Say. 

 Bulimus fallax Gotdd. 

 Pupa contracta Say. 



armifera Say. 



pentodon Say. 

 Carychium exiguum Say. 

 Vertigo simplex Gould. 



Gouldii Binney. 

 Achatina lubrica Muller. 



Hildretli. — 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 .S'«^. 



ellipticus Barnes. 



siliquoideua Barnes. 



anodontoidea Lea. 



rectus Lam. 



ovatus Say. 



alatus Say. 

 Alasmodonta rugosa Barnes. 

 Cyclas similia Say. 

 Unio heros Say. 



tuberculatus Barnes. 



verrucosus Barnes. 



pustulatus l^ea, 



pustulosus Lea. 



metanevrua Raf. 



cornutus Ihirnes. 



rugOHUS Barnes. 



perplexus Lea. 



Unio irroratus Zea. 

 cylindricus Say. 

 torsus liaf. 

 pyramidatus Zea. 

 undatus Barnes. 

 mytiloides Raf. 

 trigonua Lea. 

 scalenius Raf. 

 cuneatus Barnes. 

 niger R<f. 

 phaseolus Ilildreth. 

 ellipsis iea. 

 foliatus Ilildreth. 

 securis Lea. 

 abruptus Say. 

 gibbosua Barnes. 

 elegans Zea. 

 multiradiatus Lea. 

 planus Barnes. 



