SYSTEMATIC INDEX. 



52. 



53. 



54. 



55. 



5iJ. 



57. 



58. 

 59. 



60. 

 61. 

 62. 



63. 



64. 

 65. 



66. 

 67. 



68. 



69. 

 70. 

 71. 



72. 



73. 

 74. 



75. 



76. 



77. 



78. 



Page j Paoe 



Sphaerium solidulum, Prime, i 79. Sphaerium argentinum, Orb. 



36 52 



Sphaerium triangulare, Say. | 80. Sphaeriumbahiense, Spix. 53 



36 , 81. Sphaerium barbadense, 



Sphaerium striatinum, Lain. 



37 

 Sphaerium stamineum, Conr. 



38 

 Sphaerium rhomboideum, 



Say. 39 



Sphaerium dentatum, Iluld. 



40 

 Sphaerium fabalis, Prime. 40 

 Sphaerium occidentale, 



Prime. 41 

 Sphaerium nobile, Gould. 41 

 Sphaerium patella, Gould. 42 

 Sphaerium vermontanum, 



Prime. 42 

 Sphaerium erdarginatum, 



Prime. 43 

 Sphaerium flavum, Prime. 43 

 Sphaerium tumidum, Baird. 



43 

 Sphaerium spokani, Baird. 44 

 Sphaerium elevatum, Hald. 



44 

 Sphaerium partumeium, Say. 



45 

 Sphaerium jayanum, Pr/7fte.46 

 Sphaerium tenue, Prime. 47 

 Sphaerium trans ver sum, Say. 



48 

 Sphaerium contractum, 



Piime. 48 

 Sphaerium securis, Prime. 49 

 Sphaerium rosaceum, Prime. 



50 

 Sphaerium sphaericum, Anth. 



50 

 Sphaerium truncatum, Lins. 



Prime'. 53 



82. Sphaerium modioliforme, 



Ant. 54 



83. Sphaerium meridionale, 



Prime. 55 



84. Sphaerium maculatum, Mrl. 



55 



85. Sphaerium veatleyii. Ad. 56 



86. Sphaerium portoricense. 



Prime. 56 



87. Sphaerium parvulum,P/7me. 



57 



88. Sphaerium viridante, Mrl. 57 



89. Sphaerium cubense. Prime. 



58 



90. Sphaerium recticardinale, 



M. .y II. 58 



91. Sphaerium planum, J/. ^- //. 



58 



92. Sphaerium formosum, 



M.yH. 59 



93. Sphaerium subellipticum, 



M. iJ- //. 59 



PisidiuiEi, Pfeiffer. 



59 



94. Pisidium virginicum,i3oj<r^. 



61 



95. Pisidium adamsi. Prime. 63 



96. Pisidium aequilaterale. 



Prime. 63 



97. Pisidium compressum. 



Prime. 64 



98. Pisidium variabile, Prime. \3^ 



99. Pisidium nov-eboracense, 



Prime. 67 



100. Pisidium abditum, Hald. 68 



101. Pisidium simile, Prime. 69 



51 ] 102. Pisidium chilense. Desk. 69 



Sphaerium lenticula, Gould. | 103. Pisidium jamaicense. Prime. 



51 70 



Sphaerium subtransversum, , 104. Pisidium pulchellum, Desk. 



Prime. 52 { 70 



