THE MANUAL OF CONCHOLOGY. 



Founded by the late Geo. W. Tryon, Ji'n., continued under the care of the 

 Conchological Section. Academy of Natural Sciences of Philadelphia, by 

 Henry A. Pilsbry, Conservator. 



The Manual of ConeholOgy is a fully illustrated mnnography of recent 

 molluscs. Issued in octavo form, in quarterly parts. Each part comprises 64 

 (or more) pages of letterpress, and 15 to 20 plates. 



The Second Sf.rie.s is now in progress : the First, Marine Univalves, of 

 which sixteen volumes have appeared finished that series as planned by its 

 illustrious founder. A supplemental volume to this series will be issued this 

 year, to contain the Dentaliidae. Of the present Series, Terrestrial Molluscs, ten 

 volumes have been published, completing Helix with Index. A few copies of 

 Vol. IX, "Guide to the Study of Helices," will be sold separately at the 

 regular subscription price. Separate copies of the Index, suitable for the purposes 

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



The Monography of the Bulimi was commenced in the tenth volume. 



The illustrations of the iNIanual have received high commendation, and are 

 fully equal to the best figures of shells published. 



Prices : — Plain (uncoloured) edition, $3 00 per part. Coloured edition, $5.00 

 per part. Fine edition (both coloured and India-tinted plates) $8.00 per part. 



Structural and Systematic Conchology, by Geo. w. Tryon, Jun. 



A Complete Conchological Text Book of 1,200 pages, 140 plates and 

 over 3,500 figures of Genera, Anatomy, «S:c. Three volumes bound in one. 

 Cloth. Price $6.00. 



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

 address : — 



S. RAYMOND ROBERTS, Treasurep. 



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



important IRc^uction of price. 



2 volumes (7 parts with 2 Supplements) 2061 pages, 

 Royal Octavo, 1886-1890. 



DR. C. A. WESTERLUND'S 



FAUNA OF THE PALAEARCTIC LAND AND FRESH -WATER MOLLUSCA, 



(I.N' German Language). 



Reduced in Price from £t,. 9s. od. to £2. is. od. post free. 

 After the sale of a limited nmnhcr of copies the original 2^r ice will again be charged. 



R. FRIEDLANDER & SOHN, BERLIN, N,W. 

 THE JOURNAL OF CONCHOLOGY. 



Vol. IX, No. 9, January, 1900. 



PRINCIPAL CONTENTS: 



Additions to British Conchology (continued). By J. T. Marshall. 

 Sylvanus Hanley. By Edgar A. Smith. 



A cross between Limnaea stagnalis and L. auriddaria. By G. W. Chaster. 

 Etymology of the names Azeca and Assiminea of Leach. By the Rev. G. A. Frank 

 Knight. (Illustrated.) 



ANNUAL SUBSCRIPTION, 5s. 



Hon. Secretary, W. E. HOYLE, M.A., The Owens Colleg-e, 



Manchester. 



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