NORTH 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 partumeia Say. 



3 similis Say. 



4 rhomboidea Say. 



1 Unio alatiis Say. 



2 abruptus Say. 



3 anodontoides Lea. 

 4t arctior Lea. 



5 asperrimus Lea. 



6 ^sopus Green. 



7 crassus Say, 



8 cicatricosus Say. 



9 cylindricus Say. 



10 circulus Lea. 



11 compressus Zea. 



12 coccineus Zea. 



13 Cooperianua Lea. 



14 clavus Za;/i. 



15 cuneatus Barnes. 



16 cornutus Barnes. 



17 dehiscens aSo^. 

 IS ebenus Zea. 



19 elegaiis Zea. 



20 ellipsis Lea. 



21 fabalis Zea. 



22 formosua Lea. 



23 foliatus Ilildreth. 



24 fragosa Conrad. 



25 gibbosus Barnes. 



26 gracilis Barnes. 



27 Graniferus Zea. 



28 glans Zea. 



29 Hildrethianus Zea. 



30 heros .Sa^. 



31 irroratus Lea. 



32 iris L.a. 



33 laevissimus Lea. 



34 lachrymosuB Zea. 



35 multiradiatua Lea. 



No. 



36 tJnio metanevra Eaf. 



37 monodontus >Sa2/. 



38 nasutus Say. 



39 occidens Lea. 



40 Ovattis iSa^. 



41 ptistulosus Lea. 



42 perplezus Zea. 



43 pyramidatus Lea. 



44 ptistulatus Lea. 



45 pileus Zea. 



46 phaseolus Hildreth. 



47 parvus Barnes. 



48 personatus <S«^ 



49 plicatus Say. 



50 politus •Say. 



51 ridibundus Say. 



52 rectus Za??i. 



53 rangianus Lea. 



54 rubiginosus Lea. 



55 subovatus Zea. 



56 Schoolcraftensis Lea. 



57 securis Zea. 



58 sulcatus Lea. 



59 siliquoideus Barnes. 



60 Sayii IT^arc/. 



61 triangularis Barnes. 



62 tuberculatus Barnes 



63 torsa 7u//. 



64 trigonis Lea. 



65 tenuissimus Zea. 



66 undatus Barnes. 



67 verrucosus Barnes. 



68 zigzag 7.ca. 



1 Alasmodonta ambigua .Say. 



2 calceola Zea. 



3 deltoidea I^ea. 



4 complanata Lea. 



5 rugosa Zea. 



6 truncata Saij, 



1 Anodonta edentula Say. 



2 Ferussaciana Zea. 



3 Wardiana? Lea. 



4 plana Zea. 



5 pavonia Zea. 



6 imbecilis Say. 



