Miscelianeous Exchanges for Mollusca. 
Tertiary and other fossils from Southern States and 
Europe ; 50 species of Bird’s Eggs; and 60 pounds of 
Minerals consisting of Amethyst on Agate; Agates 
rough and polished; Pyromorphite; Native Copper ; 
Zinc blende; Galena; rare Iron Ores &c., &c., for 
strictly fine and correctly named Mollusca from South 
and Central America, Asia, Africa and Australia. 
Address W. D AVERELL, 
Chestnut Hill, Philada., Pa. 
BOOK EXCHANGE. 
[OPEN TO ALL SCIENTISTS. | 
OFFERED—Ohio Geological Reports for Penna. 
Geological Reports. Also, Powell’s 2d Annual Geo- 
logical Report for the 3d or sth. 
Prof. E. T. NELSON, Delaware, Ohio. 
OFFERED —Kirby’s Butterflies-anad Moths, new, 
bound, for exchange. Wanted—Cooke’s ‘‘ Handbook 
of British Fungi; ’’ “‘ Rust, Smut, Mildew and Mould,”’ 
or any other good works. ARTHUR DOWNES, 
Combe Raleigh, Honiton, Devon, Eng. 
FOR EXCHANGE—“ Knowledge,’’ Annals 
Natural History and Midland Naturalist from April to 
August. TOE UL PiEY, 17 Brazenose:st.,) © > 
Manchester, Eng. 
OFFERED—Woodward’s ‘‘ Manual of the Mol- 
lusca’’ and Scientific Recreation. Wanted—Geologi- 
cal Works. GEO. E. EAST, JR., 10 Basinghall St., 
London, E. C. 
OFFERED—Woodward’s Manual of the Mollusca 
‘75 Edition; Leidy’s Memoir of the Extinct Sloth 
Tribe, N. A.; Lea’s Syn. of Family of Naiades, ’52 
edtn.; Hayes’ Descrip. Inf. Max’y. Bones of Masto- 
dons, 1o plates; Agassiz & Gould’s. Comp. Physi- 
ology, Bohn’s edt’n; Coultas, Prin. Botany, Crypto- 
gamia; Lea’s On a Fossil Saurian of the New Red 
Sandstone Formt’n.; Leidy’s Geol sketch of Est. & 
Fr. Water deposit of Judith R. &c., prest’n copy; 
Meigs’ Obs. Rep. Organs of Dolphin; Lesquereux’s 
Cretaceous Flora, 30 plates. Smith’n Mis. Col. Vol. 4, 
Neuroptera, Vol. 6, Diptera and Caleoptera 3 pp. out. 
WANTED—Eirst 3 vols. Lea’s Obs. Genus. Unio; 
Say’s American Conchology; Goulds Invertebrata of 
Mass.; Kiener’s plates of Shells; Carpenter’s works ; 
Tryon’s Monog. Terr. Moll. of U. S.; Sowerby’s 
Conch. Manual and Plates; or effers in works on 
Conchology. W. D. AVERELL, 
Chestnut Hiil, Phila. 
ANSWERS TO CORRESPONDENTS. 
[OPEN TO ALL SUBSCRIBERS. | 
Amateur :—Helicina subtropica is not de- 
scribed in W. G. Binney’s * Land and Fresh- 
water Shells of North America,” and it there- 
fore looks as though your specimens were 
of 
misnamed. It may be H. tropica Jan which 
is synonymous with H. orbiculata, Say. Habitat, 
Texas to Georgia, Tennessee to Florida. 
B. P. R.—Limnzea gracilis Jay, was dis- 
covered by Prof. Emmons in Lake Champlain. 
Dr. J. Lewis also found it in Schuyler’s Lake, 
N. Y. The color and form of this shell would 
indicate its preference for clear, deep water. 
T. S. H. New Orleans, La.—Linnzeus was 
knighted. by the King of Sweden in 1757, as 
a reward for an invention of his by which the 
fresh-water pearl mussel was made to produce 
its pearls artificially. 
Inquirer, Hartford, Ct—You are correct. 
Unio Cunninghami was found in the lakes of 
Sumter Co., Fla.; but it received its name from 
Prof. Berlin H. Wright. 
C. T. S.—Try a weak solution of some 
colorless acid taking care to apply it only to 
the parts of the sl.ell needing removal. Will 
inquire further. 
PUBLICATIONS RECEIVED. 
1. “The Tertiary Fauna of Newton and 
Wautubbee, Miss ’’ by Otto Meyer and T. H. 
Aldrich. 2. ‘Catalogue of Uniones in the 
cabinets of W. W. Calkins,” (now the prop- 
erty of T. H. Aldrich), from T. H. Aldrich, 
Cincinnati, Ohio. 
“List of Shell-bearing Mollusca of Mich- 
igan,”’ by W. H. DeCamp, M. D., from the 
“ Kent Scientific Institute.” 
“The Shells of Pettis County, Mo.,”’ by F. 
A. Sampson, Sedalia, Mo., from the author. 
Lists of ‘ Hygrophila and Thalassophila”’ 
*Unionide and Cyrenidz”’ in the collection of 
J. J. Brown, M. D., Sheboygan, Wis. 
NECROLOGY. 
Captain D. H. Murdoch, U. S. A., an 
enthusiastic student of nature was drowned in 
the Grand River, Utah, on June 6th, 1886, 
