i THE NAUTILUS. 
STANDARD WORKS ON CONCHOLOGY. 
SOLD ONLY FOR CASH. 
STRUCTURAL AND SYSTEMATIC CONCHOLOGY. By Geo. W. Tryon, Jr. New, 
complete, plain edition. Illustrated. $16.00, postpaid. 
WOODWARD’S MANUAL OF ‘THE MOLLUSCA. Appendix by Ralph Tate. Last 
edition, $2.75, postpaid. a 
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. 25sc., postpaid. 
WRIGHT’S CHECK LIST OF N. A. UNIONIDA, &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 and 2, 75c.; Vol. 2, 60c.; Vol. 3, 60c. Postpaid. 
THE CONCHOLOGISTS’ EXCHANGE. Back numbers. Vol. 1, minus No. 1, 50c.} 
Vol. 2, Nos. 1 tog, 35c. Postpaid. 
CONTRIBUTIONS to the Mollusca of Florida By Chas. T. Simpson. Price 25c., postpaid. 
NOMENCLATURE AND CHECK-LIST OF AMERICAN LAND SHELLS. By H.A. 
Pilsbry. Price roc., postpaid. soc. per dozen copies, postpaid. 
YOU CAN SAVE MONEY BY ORDERING SCIENTIFIC BOOKS FROM 
W. D. AVERELL, Mt. Airy, Phila., Pa. 
Nomenclature and Check-List 
—_—OF— 
AMERIGAN LAND SHELLS. 
A list of United States Land Shells, complete to Sept., 1889, containing the 
species and varieties with their habitats, prefaced by a brief discussion of their 
nomenclature. 
Collectors interested in American Shells will find this a useful list for arranging 
and nanin:z their collections, checking desiderata in making exchanges, etc. 
20 pages, Octavo, Price, single copies - 10 cts. 
ss Ss “«* per dozen - 50 ects. 
Address : 
HT, A. PIL SBE, 
Academy of Natural Sciences, 
Logan Square, Philadelphia, Pa. 
