NORTH AMERICAN CONCHOLOGT. 



TT 



No. 



47 Helix solitaria Say. 



48 striatella Anthony. 



49 suppressa Say. 



50 tridentata Say. 



51 thyroideus Say. 



52 zaleta Say. 



53 Limnea caperata Say. 



54 decidiosa Say. 



L. acuta Lea. 



Philadelphica Lea. 



55 elodes •S'ay. 



56 humilis Say. 



L. parva Lea. 



57 reflexa (S'aj/. 



i. exilis Lea. 



58 jugularis /Saj/. 



i. speciosa Rossmasler. 



59 umbrosa Say. 

 59J columella Say. 



L. chalijhea Gould. 



60 Melania canaliculata Say. 



61 conica Saij. 



62 depygis Say. 



63 ezilis Ilald. 



M. Kirllandianus Lea. 



64 gracilis Anthony. 



65 Sayii Wood. 



66 excurata Conr. 



67 undulata 5«y. 

 C8 varicosa Ward. 



69 Paludinaheterostrophaiurf. 



70 Integra Say. 



71 ponderosa Siay. 



72 Bubcarinata Say. 

 72^ decisa Say. 



73 Physa ancillaria ^Say. 



74 elongata Say. 

 75 



70 gyrina Say. 



P. elUptir.a Lea. 



77 heterostropha Say. 



]'. aurca Loa. 



78 Planorbis armigerus Say. 



79 bicarinatua Say. 



No. 



80 Planorbis campanulatus Say. 



81 concavus Anthony. 



82 corpulentus £>'«!/. 



83 deflectus Say. 



84 dilatatus Gould. 



P. lens (preoccupied) Lea. 



85 exacutus Say. 



Paludina hyalina Lea. 



86 lentus Say. 



87 parvus Say. 



88 trivolvis Say. 



89 Pupa albilabris Ward. 



Cyclostoma marginata Say. 



90 armifera Say. 



91 contracta Say. 



92 corticaria ^ay. 



93 exigua Say. 



94 modesta Say. 

 94J pentodon <S'«^. 



95 Succinea campestris Say. 



S. ohliqua Say. 

 retusa Lea. 

 9G avara Say. 



97 ovalis 5ay. 



<S. aurra Lea. 



98 Valvata sincera Say. 



99 tricarinata 5ay. 



T'. hirarinata Lea. 



100 XJnio alasmodontinus Bam. 



U. comprcssus Lea. 



101 alatus Say. 



U. mryaptcrus Raf. 



102 bullatus Raf. 



U. prasinus Conrad. 

 Schoolcraftensis Lea. 

 pustulosus Lea. 

 Dorfeuillanus Lea. 



103 cardlum J?a/. 



U. ventricosus Barnes. 

 occidens Lea. 

 suhovatus Lea. 

 dolahrsrformis Lea. 



104 cloatricosua <S'a^. 



L'. varicosus Lea. 



