108 THE NAUTILUS. 



the height of three or four inches. I shall continue these experi- 

 ments next summer. — Dr. G. D. Lind, St. Loins, Mo. 



Mr. Ellwood Pleas, of Dunreith, Indiana, has returned from 

 a very successful collecting trip in Alabama. He secured about 

 100 species of marine shells from the Gulf, nearly 20 species of land 

 shells, about 30 Strepomatidte and 50 Unionidse. About 250 spe- 

 cies of fossils were collected, many very large and choice specimens 

 among them. 



EXCHANGES. 



Exchange. — Land, fresh water and marine shells from France 

 and all other regions — shells also purchased readily. Species of the 

 genus Pecten solicited. — Mr. Bavay, Grand rue, Brest, France. 



For Exchange. — The beautiful 4norfontosw6or6ic?/^ato Say and 

 corpulenta Cp. from Thompson's Lake, 111. Also many fine Unios 

 from Spoon River, 111. Fine Helix multilineata Say, and others. 

 Will exchange for any species, not in my collection, land or sea. — 

 Dr. W. S. Strode, Bernadotte, III. 



A FEW NEW AND RARE SHELLS for exchange for other rare shells. 

 Clementia siibdiaphana Carpenter, Nassa californiana Conrad, Sur- 

 cula carpenteriana Gabb, Cancellaria crawfordlana Dall. — J. S. 

 Arnheim, 8 Stewart St., San Francisco, Cal. 



Exchange. — Offered British shells, land, fresh water and marine, 

 for other shells not in my collection. — E. R. Sykes, 15 Doughty St., 

 London, W. C, England. 



Wanted. — Pacific Coast land and fresh water shells, slugs in- 

 cluded. Will give British land and fresh water and marines, or 

 Virginia laud and fresh water species. Address, Capt. W. J. 

 Farrer, Box 43, Orange, Va. 



Offered — Helix prof anda, tridentata, albolabris ; Zonites ftdgi- 

 nosus, inornatus, ligerus; Patula pei'spectiva, alternata ; Selenites 

 concavus ; Physa heterostropha ; Sphcerium striatiim; Ancylus fuscus. 

 Wanted, United States land and fresh water shells. — >S'. H. Stupa- 

 Tcoff, E. E. Pittsburgh, Pa. 



Wanted. — Zonites from any locality in exchange for British land 

 and fresh water shells. — Robert Walton, Charles St., Lower Rox- 

 borough, Philadelphia, Pa. 



Wanted. — Vallonia from all localities. — Dr. V. Sterki, New 

 Philadelphia, 0. 



