Che Conchologists Exchange. 
COPYRIGHT SECURED, 
A Monthly Publication designed for Conchologists and Scientists 
generally. Wm. D. Averell, Editor and Publisher. 
Vol. Il. MARCH and APRIL, 1888. 7) 
May % ee 
Ce IN TEN eS. 
PAGE. 
The Shell-Bearing Mollusca of Rhode Island, H. F. Carpenter, 5 " 109 
Brief Notes on the Land and Fresh-Water Shells of Mercer Co., Ill., Wm. A. Marsh, 1@ fo) 
Notes on the Unionidee of Florida, Dr. S. H. Wright and Berls H. W right, III 
Lyogyrus, Gill, and other American shells, H. A. Pilsbry, 113 
Margaritana Hildrethiana, Lea, B. Shimek, 114 
Notes on American Shells, Rey. Wm. M. Beauchamp, 114 
A Noted Scientist Dead (Geo. W. Tryon, Jr.) From Phila. Public Laden II5 
Bell Taps, : : : : F : 116 
Editorial Notes, 117 
The Conchologist in Beamuded Me Matthew Tones 118 
A Collecting Trip to Onset Bay, Mass., F. C. Baker, . 119 
Exchanges, 3 119 
Standard Works on Concho 120 
CHESTNUT HILL, Philadelphia, Pa. 
Single copies, 5 cents; 50 cents a year in the United States 
and Canada; Foreign Countries, 62 cents; Countries not in 
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