34 



' 



i6 



17 



18 



19 



20 



2 I 

 22 



23 



^4 



-'5 

 26 



27 

 28 

 29 



30 

 31 



32 

 33 

 34 

 35 

 36 

 37 

 3S 



39 



40 



4< 

 42 



43 



44 



45 

 46 



47 

 48 



49 



50 



S[jhceriiim Jayanum, Prime. 



" tenue, Prime. 



" transversum, Say. 



" secure, Prime. 



" rosaceum, Prime. 



•' truncatum, Linsley. 



" lenticulum, Gould. 



Pisidium Virginicum, Gmel. 



" Adamsi, Prime. 



" compressum, Prime. 



" variabile, Prime. 



" abditum, Hald 



" ventricosum, Prime. 



" rotundatum, Prime. 



" occidentale,Ne\vcomb, 



■■' ultramontanum, Prime, 

 sp. 

 sp. 

 sp. 

 Unio alatus, Say. 

 " asperrimus, Lea. 

 " borealis, A. F. Gray. 

 " Canadensis, Lea. 

 '■ cariosus. Lea. 

 " complanatus, Sol. 

 " ellipsis, Lea. 

 " gibbosus, Barnes. 

 " gracilis, Barnes. 



lachrymosus, Lea. 

 '■ ligamentinus. Lam. 

 " luteolus, Lam. 

 " multiplicatus, Lea. 

 " nasuius, Say. 

 " occidens, Lea. 

 " phaseolus, Hildreth. 

 " plicatus, LeS'jeur. 



5 1 Unio pressus, Lea. 



• radiatus, Lam. 



' rectus, Lam. 



' rubiginosus, Lea. 

 spatulatus. Lea. 



' subovatus, Lea. 



' tenuissimus, Lea. 



' triangularis, Say. 



' undulatus, Barnes, 



' ventricosus, Barnes. 

 6 1 Margaritana calceola. Lea. 



52 

 53 

 54 



55 

 5^' 

 5 7 

 5S 



59 

 60 



62 

 63 



65 



66 



complanata,Barnes. 

 margaritifera, L. 

 marginata. Say. 

 rugosa, Barnes, 

 undulata, Say. 



67 Anodonta angulata, Lea. 



68 

 69 



70 



7' 

 72 



— ^ 



74 



75 

 76 



77 

 78 



79 



80 



81 

 82 



83 



84 



85 

 86 



Benedictii, Lea. 

 corpulenta, Cooper. 

 Dallasiana, Lea. 

 edentula. Say. 

 Ferussaciana, Lea. 

 fluviatilis, Dillwyn. 

 Footiana, Lea. 

 fragilis. Lam. 

 implicata, Say. 

 Kennicottii, Lea. 

 lacustris, Lea. 

 Lewisii, Lea. 

 Nuttalliana, Lea. 

 ovata, Say. 

 plana, Lea. 

 Simpsoniana, Lea. 

 subcylindracea. Lea. 

 undulata. Say. 

 Wahlamatensis, Lea. 



