NORTH AMERICAN CONCHOLOGT. 



55 



Page. 



No. 



Unio— 



Page. 



No. 



Margaritana — 



172 



*63 



Schoolcraftensis Le. 



172 



*79 



calceola Lea, 



172 



64 



securis Lea. 



172 



80 



complanata Lea, 



172 



65 



solidus Lea. 



172 



81 



marginata Lea. 



172 



66 



subovatus Lea. 



172 



*82 



rugosa Lea. 



172 



67 



Bubrotundus Lea, 







Anodonta — 



172 



68 



sulcatus Lea. 



172 



83 



Buchanensis Lea. 



172 



69 



tenuissimus Lea. 



172 



84 



decora Lea. 



172 



70 



triangularis Barnes. 



172 



85 



edentula Lea. 



172 



71 



trigonus Lea. 



172 



86 



Ferrussaciana Lea 



172 



.72 



tuberculatus Barnes. 



172 



87 



imbecilis Say. 



172 



73 



undulatus Barnes. 



172 



88 



ovata Lea. 



172 



74 



varicosus Lea. 



172 



89 



pavonia Lea. 



172 



75 



ventricosus Barnes. 



172 



90 



Fepiniana Lea. 



172 



76 



venustus Lea. 



172 



91 



plana Lea. 



172 



77 



verrucosus Barnes. 



172 



92 



salmonia Lea. 



172 



78 



zigzag Lea. 



UNIVALV 



172 

 E SH 



93 

 ELLS 



Wardiana Lea, 



172 



94 



Ancylus rivularis Say. 



173 



120 Helix obstricta Say. 



172 



95 



Helix albolabris Say. 



173 



121 



palliata Say. 



172 



96 



alternata Sai/. 



173 



122 



Pennsylvanica Gr, 



172 



97 



appressa Say. 



173 



123 



perspectiva Say, 



172 



98 



arboreus Sat/. 



173 



124 



profunda Say. 



172 



99 



clausa Say. 



173 



125 



solitaria Say. 



173 



100 



concava Say. 



173 



126 



tridentata Say. 



173 *101 



diodonta Say. 



173 



127 



"Wardiana Lea. 



173 



102 



elevata Say. 



173 



128 



zaleta Lea. 



173 



103 



fallax Say. 







Polygyra — 



173 



104 



fraterna Say. 



173 



129 



Dorfeuilliana Lea. 



173 



105 



fuliginosus Griffith. 



173 



*130 Heleciana. 



173 



106 



glaphyra Say. 



173 



131 



Pupa armifera Say. 



173 



107 



gularis Say. 



173 



*132 



exigua Say. 



173 



108 



harpa Say. 



173 



133 



ovata Say. 



173 



109 



hirsuta Say, 



173 



134 Succinea a vara Say. 



173 



110 



indentata Say. 



173 



135 



cvalis Say. 



173 



111 



inflecta Say. 



173 



136 



retusa Lea. 



173 



112 



inornata Say. 



173 



137 



vermetUB Say. 



173 



113 



interna Say. 







Cyclostoma — 



173 



114 



labyrinthica Say. 



174 



138 



lapidaria Say. 



173 



115 



ligera Say. 



174 



139 



marginalis Say. 



173 



116 



lineata Say. 







PlanorbiB — 



173 



117 



minuta Say. 



174 



140 



armigeruB Say, 



173 



118 



Mitchella Lra. 



174 



141 



bicarinata Say. 



173 *119 



multllineata Say. 



174 



142 



campanulata Say. 



