NORTII AMERICAN CONCHOLOGY. 



75 



No. 



3 Melania depygis Say. 



4 Kirtlandiana Lea. 



5 excurata Conrad. 



6 gracilis Anthony. 



7 Sayii Wood. 



8 undulata Say. 



9 varicosa Ward. 



1 Cyclas dubia Say. 



2 partunieia Say. 



3 similis Say. 



4 rhomboidea Say. 



1 Unio alatus Say. 



2 abruptus Say. 



3 anodontoides Zea. 



4 arctior £ea. 



5 asperrimus Lea. 



6 iEsopus Green. 



7 crassus *S'a?/. 



8 cicatricosus <Sa#. 



9 cylindricus Say. 



10 circulus Lea. 



11 compressus Zea. 



12 coccineus Lea. 



13 Cooperianus Zea. 



14 clavus Lam. 



15 cuneatus Barnes. 



16 comutus Barnes. 



17 dehiscens <S'a#. 



18 ebenus Zea. 



19 elegans Lea. 



20 ellipsis Lea. 



21 fabalis Zea. 



22 formosus Lea. 



23 foliatus Ilildreth. 



24 fragosa Conrad. 



25 gibbosus Barnes. 



26 gracilis Barnes. 



27 Graniferus Zea. 



28 glans Zea. 



29 Hildrethianus Zea. 



30 heros Say. 



31 irroratus Zea. 



32 iris L»a. 



33 laevissimus Zea. 



34 lachrymosus I^ea. 



35 multiradiatus Lea. 



No. 



36 Unio metanevra Raf. 



37 monodontus *S'a_y. 



38 nasutus Say. 



39 occidens Zea. 



40 Ovatus Say. 



41 pustulosus Lea. 



42 perplexus Zea. 



43 pyramidatus Lea. 



44 pustulatus Zea. 



45 pileus Lea. 



46 phaseolus Hddreth. 



47 parvus Barnes. 



48 personatus *Say 



49 plicatus »S'a_y. 



50 politus Say. 



51 ridibundus Say. 



52 rectus Zaw. 



53 rangianus Lea. 



54 rubiginosus Zea. 



55 subovatus Lea. 



56 Schoolcrafteusis Lea. 



57 securis Zea. 



58 sulcatus Lea. 



59 ' siliquoideus Barnes. 



60 Sayii IT^ara". 



61 triangularis Barnes. 



62 tuberculatus Barnes 



63 torsa Z'a/. 



64 trigonis Lea. 



65 tenuissimus Zea. 



66 undatus Barnes. 



67 verrucosus Barnes. 



68 zigzag Zea. 



1 Alasmodonta ambigua (Say. 



2 calceola Zea. 



3 deltoidea Lea. 



4 complanata Lea. 



5 rugosa Zea. 



6 truncata Say. 



1 Anodonta edentula Say. 



2 Ferussaciana Zea. 



3 Wardiana? Lea. 



4 plana Zea. 



5 pavonia Lea. 



6 imbecilis Say. 



