— 
bo 
CO 
THE NAUTILUS. 
76. Planorbis parvus Say. B, T, F, D. 
77. Segmentina armigera Say. Everywhere abundant. 
78. Ancylus (sp.?). M, D. 
79. Spherium suleatun Lam. B,F, H. Mississippi River at 
St. Cloud. Specimens extra large and fine. 
80. Spherium striatinum Lam. R, F, D, M. 
81. Spherium transversun Say. D. 
82. Spherium truncatum Linsley. R, F, 8, B, F. 
83. Spherium rhomboideum Say. B, H. Mississippi River at 
St. Cloud. 
84. Spheriwn solidulum Prime. M, F. 
85. Spherium Jayanum Prime. Marshes near Clearwater. 
86. Spherium securis Prime. H. 
87. Pisidium virginicum Gmel. F. 
88. Pisidium abditum Hald. F, H, B, T,C. Spring at Belle- 
vue, Lowa. 
89. Pisidium Walkeri Sterki. F, M. 
90. Pisidiwm politum Sterki. F, B. 
91. Pisidiwm variabile Prime. F, C, H. 
92. Pisidium compressum Prime. F, M, C. 
93. Pisidium ferrugineum Prime. F, M, H. 
94. Pisidium rotundatum Prime. B. T. 
95. Unio oceidens Lea. M. 
96. Unio rectus Lam. C, M, F. Red River of the North, Fargo, 
97. Unio luteolus Lam. C. 
98. Unio ligamentinus Lam. M. 
99. Anodonta footiana Lea. 
The Pisidia enumerated above are certified to by Dr. Sterki; the 
Spherium by Mr. E. W. Roper; and such other species as there 
was any doubt concerning by Prof. H. A. Pilsbry. 
” 
TRANSACTIONS OF THE ISAAC LEA CHAPTER. 
[Conducted in the interest of the Isaac Lea Conchological Chapter of the Agassiz Associa- 
tion by its General Secretary, Mrs. M. Burton Williamson. ] 
Owing to the delay of some of our reports the volume of Trans- 
actions was not started promptly on its annual round, but we hope 
our members will make allowance for the delay. The volume will 
