IV 



THE NAUTILUS. 



THE MANUAL OF GONCHOLOQY. 



Founded by the late Geo. W. Tryon, Jr., continued under the care of the Con- 

 chological Section, Academy of Natural Sciences of Philadelphia, by Henry A 

 Pilsbry, Conservator. 



The Manual of Conchology is yi fully illustrated monography of recent mollusks. 



Issued in octavo form, in quarterly parts. Each part comprises 64 (or more) 

 pages of letterpress, and 15 to 20 plates. 



Two series are now in progress : the FIRST SERIES, Marine Univalves, of which 

 fifteen volumes have appeared, finishing the series as planned by its illustrious 

 founder. A supplemental volume to this series will be issued this year, to contain 



ately at the regular subscription price. Separate copies ot the Itiae: 

 the purposes of a Catalogue or Check list can also be had at $1.00 each. 



The Mouography of the Bulimi has bceu commenced in the tenth volume. 



The illustrations of the Manual have received high commendation, and are fully 

 equal to the best figures of shells published. 



Prices: Plain (uncolored) edition 53.00 per part. Colored edition $5.00 per part. 

 Fine edition (both colored and India-tinted plates) $S.oo per part. 



Structural and Systematic Conchology, by GEO W. TRYON, Jr. 



A COMPLETE CONCHOLOGICAL TEXT BOOK of 1200 pages, 140 plates and over 3500 

 figures of Genera, Anatomy, etc. Three volumes bouud in one. Cloth. Price 6.00. 



For further information or descriptive circular, with sample plates of Manual, 

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S. RAYMOND ROBERTS, Treasurer, 



P. 0. Address, GLEN RIDGE, NEW JERSEY, U. S. A. 



American Naturalist." 



MANAGING EDITORS : 



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DR. C. O. WHITMAN, of Chicago University, Chicago, III. 



DR. C. E. BESSEY, of The University of Nebraska, Lincoln, Neb. 



DR. H. C. MERCER, of The University of Pennsylvania. 



PROF. C M. WEED, College of N. H., Hanover. N. H. 



PROF. W S BAYLEY. of Colby University, Waterville, Me. 



Pi'.OF. E. A. ANDREWS, of Johns Hopkins University, Baltimore, Md. 



PROF. A. C. GILL, Cornell University, Ithaca, N. V. 



PROF. H. C. WARREN, Princeton University, Princeton, N. J. 



ERWIN F. SMITH, Department of Agriculture, Washington, D. C. 



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