ll THE NAUTILUS. 
STANDARD WORKS ON CONCHOLOGY. 
SOLD ONLY FOR CASH. 
STRUCTURAL AND SYSTEMATIC CONCHOLOGY. By Geo. W. Tryon, Jr. New, 
complete, cheap edition. Illustrated. $8.00, postpaid. 
WOODWARD’S MANUAL OF ‘THE MOLLUSCA. Appendix by Ralph Tate. Last 
edition, $2.75, postpaid. 
KEEP’S WEST COAST SHELLS. A fascinating book for collectors, young and old. 
182 illustrations. $1.75, postpaid. 
BALDWIN’S LAND SHELLS OF THE HAWAIIAN ISLANDS. 25c., postpaid. 
WRIGHT’S CHECK LIST OF N. A. UNIONID&A, &c. 25c., postpaid. 
RANDOM NOTES ON NAT. HISTORY. Containing H. F. Carpenter’s article, ‘‘ The 
Shell-Bearing Mollusca of R. I.;’’ and Ritchie’s ‘‘ Check List of Shells.’’ Vol. 1, minus 
Nos. 1 aud 2, 75c.; Vol. 2, 60c.; Vol. 3, 60c. Postpaid. 
THE CONCHOLOGISTS’ EXCHANGE. Back numbers. Vol. 1, minus No. 1, s5o0c.: 
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Orders taken for Tryon’s Manual. Conchological, and other works not in stock, supplied at short notice. 
PRINTING IN ALL ITS BRANCHES, NEATLY AND PROMPTLY 
EXECUTED, AND ESTIMATES FURNISHED. 
W. D. AVERELL, Mt. Airy, Phila., Pa. 
PUBLICATIONS FOR SALE BY THE CONCHOLOGICAL SECTION, ACADEMY 
OF NATURAL SCIENCES OF PRILADELPRIA, 
STRUCTURAL AND SYSTEMATIC CONCHOLOGY, 
A Guide to the Study of Mollusca. 
BY GEO. W. TRYON, Jr. 
CHEAP EDITION. Text on thin paper. Illustrations (printed on both sides of the pages), 
also on thin paper. 3 volumes bound in one, cloth, : ‘ : é , 2 $8.00 
PLAIN EDITION. All the plates uncolored, but on plate paper. Letter-press same as in 
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MANUAL OF COC © heey - 
BY GEO. W. TRYON, Jr. 
Continuation by HENRY A. PILSBRY. 
FIRST SERIES.—Marine univalves, Vols. I to X. 
SECOND SERIES.—Terrestrial Mollusks, Vols. I to V. 
Address for circulars giving contents, 
S. RAYMOND ROBERTS, 
Treasurer Conchological Section, 
Logan Square, Philada., Pa. Philada, Acad. Nat. Sciences. 
