60 THE NAUTII.US. 



Philadelphia. He and his brother officers and some of the mem- 

 bers assemble there once a week, open the packages, verify the 

 names, label and mount the specimens and place them in the cases. 

 In the next issue of the Nautilus we will begin again the work 

 of acknowledging the receipt of all shells sent during the month 

 bv the members. 



EXCHANGES. 



(Exchange notices of moderate length will be inserted free for subscribers.) 



Wanted to exchange British and Tropical Mollusca for U. S. 

 Mollusca of all kinds. Please send lists first and receive mine. 

 None of the commonest species required. — B. Tomlin, 69 Liverpool 

 Road, Chester, Eng. 



Wanted, Helices, in exchange for land and fresh-water shells. — 

 Edw. G. Vanatta, 1608 N. 12th St., Philadelphia, Pa. 



Wanted. — Marine univalves, especially of Mexico, Central and 

 South America. Offered — many specimens, Marine, Land, and 

 Fresh- Water, both U. S. and Foreign. — E. C. Broione, Framingham, 

 Mass. 



Collectors who desire to dispose of North American Land, 

 Fresh-water and Marine shells for those of California, will do ivell 

 by sending their exchange lists to Williard 31. Wood, 2817 Clay 

 Street, San Francisco, Cal. 



Pacific Coast, marine, land and fresh water shells, for land and 

 fresh water shells of the West Indies and South America, G. W. 

 Lichtenthaler, Bloomington, Ills. 



Fossils from the Silurian, Devonian Subcarboniferous and Car- 

 boniferous, to exchange for other fossils, especially of the Cretan 

 ceous and Tertiary ; send lists and receive mine. C. S. Hodgson, 

 Albion, III. 



Cretaceous and Eocene fossils, minerals, agates, marine and 

 fresh water shells, to exchange for rare marine shells, cloth-bound 

 books or agates. Homer Squyer, Mingusville, Mont. 



Herkimer County Land and Fresh-water Shells to 

 exchange for desirable species from other localities. Send lists and 

 receive mine. Albert Baily, Chepachet, N. Y. 



