128 THE NAUTILTTS. 



76. Plunorbix parrns Say. B, T, F, D. 



77. Segmentinn uriiiiyrnt Say. Everywhere abundant. 



78. Jney/x(sp.?). M, D. 



79. Sjihirrinm fnileaium Lain. B, F, H. Mississippi River at 

 St. Cloud. Specimens extra large and fine. 



80. Sphcerium 4riatiiun Lain. R, F, D, M. 



81. Sjihn riii in fi-iiHxi'ei'xinii Say. I>. 



82. Sphcerium triinc/ttiint Linsley. R, F, S, B, F. 



83. Sjihieriiiin rhomboideum Say. B, H. Mississippi River at 

 St. Cloud. 



84. SpJioerium solidulum Prime. M, F. 



85. Sphcerium Jiiynnum Prime. Marshes near Cleanvater. 



86. Sphcerium srrurlx Prime. H. 



87. Pisidium virginwum Gmel. F. 



88. Pixldhnit fiMltum Hald. F, H, B, T, C. Spring at Belle- 

 vne, Iowa. 



89. Pixidium Wilkeri Sterki. F, M. 



90. Pisidium jiolltum Sterki. F, B. 



91. J'ixidiinii I'lirinbile Prime. F, C, H. 



92. Pistdlmn cniiijirexxttiii Prime. F, M, C. 



93. Pisidium ferrugineum Prime. F, M, II. 



94. PificJiinn rotundatum Prime. B. T. 



95. Unio occidens Lea. ' M. 



96. Unio mins Lam. C, M, F. Red River of the North, Fargo, 

 N. D. 



97. Unio luteolti* Lam. C. 



98. Unio ligamentinus Lam. M. 



99. Anodonta footiana Lea. 



The l'i*i<lin enumerated above are certified to by Dr. Sterki ; the 

 X/i/tii't'iiiiii 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. 



[Coiuliirtril iii the interest of tin- Isaac Lea Cnnchologicnl Chapter of the Agassiz 

 tion by its ' ..'tirral Secretary, Mrv M. lUu Ion Williain.son. 



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 



