SECTION A.] NORTH AMERICAN CONCHOLOGY. 



623 



No. 



85 Planorbis exacutus Say. 



Paludina hyalina Lea. 



86 lentus Say. 



87 parvus Say. 



88 trivolvis Say. 



89 Pupa albilabris Ward. 



Cyclostoma marginata 



90 armifera Say. [Say. 



91 contracta Say. 



92 corticaria Say. 



93 exigua Say. 



94 modesta Say. 



95 Succinea campertris Say. 



S. retusa Lea. 



96 avara Say. 



97 ovalis Say. 



9S Valvata sincera Say. 

 99 tricarinata Say. 



V. bicarinata Lea. 

 190 Unio alasmodontinus Barn. 



U. compressus Lea. 



101 alatus Say. 



U. megapterus Raf. 



102 bullatus Raf. 



U. prasinus Conr. 



Schoolcraftensis Lea 

 pustulosus Lea. 

 Dorfeuillanus Lea. 



103 cardium Raf. 



U. ventricosus Barnes. 

 occidens Lea. 

 suh-ovatus Lea. 

 dolabraformis Lea. 



104 cicatricosus Say. 



£/. varicosus Lea. 



105 cuneatus i?o/. 



£/. modioliformis Say. 

 scalenius Raf. 

 patulus Lea. 

 decisus ? Lea. 



106 crassus Say. 



£/. ellipsarius Raf. 

 fasciatus Raf. 

 ligamentina Lam. 

 carinatus Barnes. 



No. 



£7. ellipticus Barnes. 

 venustus ? Lea. 



107 Unio cylindricus Say. 



£7. solenoides Raf. 

 naviformis Lam. 



108 cyphius ffa/. 



U. SESopus Green. 



109 dilatatus Raf. 



U. gibbosus Barnes. 

 nasutus Lam. 

 arctior Lea. 



110 flavus Raf. 



U. rubiyinosus Lea. 

 trigonus Lea. 



111 fasciolus Raf. 



U. multiradiatus Lea. 



112 fasciolaris Raf. 



U. phaseolus Hild. 

 planulatus Lea. 

 camelus Lea. 



113 flexuosus Raf. 



U.foliatus Hild. 



114 fragilis Raf. 



U. gracilis Barnes. 



115 fragosus Conr. 



116 gibbosus Raf. 



U. torulosus Raf. 

 per plexus Lea. 

 Rangianus Lea. 

 capsceformis Lea. 



117 heros Say. 



U. wndulatus Say. 

 multipiicatus Lea. 



118 lapillus Say. 



tl.fabalis Lea. 

 Troostensis Lea. 



119 leptodon /.<,;/'. 



6 r . planus Barnes. 

 velum Say. 



purpurascens Swains. 

 tenHtssinifts Lea. 



120 lineolatus fia/. 



£7. depressus Raf. 

 securis Lea. 



