IV THE NAUTILI'S. 



THE MANUAL OF CONCHOLOGY. 



Founded by the late lieo. W. Tryon, Jr., continued under the care of the Concho- 

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The Manual of Coiicliology is Aj'ullii illustrated monograph y of recent mollusks. 



Issued in octavo form, in quarterly parts. Each part comprises M lor more) pages 

 of letterpress, and 15 to 20 plates. 



Two series are now in progress: the FIKST SEUIES, Marine Univalves, of which 

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 founder. Of the SECOND SERIES, Terrestrial Molluscs. Ten Volumes have been pub- 

 lished, completing Helix with index. A few copies of Vol. IX of this series, " Guide 

 to the Study of Helices" will be sold separately at the regular subscription price. 

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 also be had at $1.00 each. 



The Monography of the Bidimi has been commenced in the tenth and eleventh 

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

 equal to the best figures of shells published. 



Prices: Plain (uncolored) edition, $3.00 per part. Colored edition, S.">.oo per part. 

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Structural and Systematic Coiicholojjy, by GEO. W. TRYON, JR. 



A COMPLETE CONCHOLOGICAI, TEXT-BOOK of 1,200 pages, 140 plates, ami <>ver ;'.,:><m 

 figures of Genera, Anatomy, etc Three volumes bound in one. Cloth. Free, $6.00. 



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

 address, 



S. RAYMOND ROBERTS, Treasurer. 



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An Illustrated CATALOGUE OF JAPANESE MARINE MOLIA'SKS, by F. 



Stearns and H. A. Pilsbry. Cloth, $3.00; paper, K. .">(>. 



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Invite collectors to write for their new lists of Mollusca, which contain 

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