On the Mollusca procured during the 'Lightning' and 'Porcupine' Expeditions, 



1868-70, part viii., by J. Gwyn Jeffreys, LL.D., F.R.S., &c. [The Author. 



Bullettino della Societa Malacologica Italiana, vol. x., fogli 1-4, con 3 tavole, 



1884 [The Society. 



The Natural History and Scientific Book Circular, No. 62, of W. Wesley, '28, 



Essex Street, London [The Publisher. 



The Naturahst, edited by W. D. Roebuck, F.L.S., and W. E. Clarke, F.L.S., 



August, September, October, November, and December [The Editors. 



Jahrbucher der deutschen Malakozoologischen Gesellschaft, July and October 



[The Editor. 

 Annual Report of the Board of Regents of the Smithsonian Institution for 1882 



[The Institution. 

 Journal of the Cincinnati Society of Natural History, October, 1884, vol. vii.. No. 3 



[The Society. 

 List of the Land and Freshwater Mollusca of the Bristol district, by Adolf Leipner 



[The Author. 

 Science, Nos. 91 — 98. [The Editor. 



Histoire des Melaniens du Systeme Europeen, par J. R. Bourguignat [The Author. 

 Transactions of the Essex Field Club, vol. iii., part 8, April, 1884 [The Club. 



Transactions of the Academy of Sciences of St. Louis, vol. iv., No. 3 [The Academy. 

 Zoologischer Anzeiger, herausgegeben von Prof. Carus, No. 181 [The Editor. 



Journal of the Royal Society of New South Wales [The Society. 



Scientific Results of the exploration of Alaska, article iv., by W. H. Dall 



[R. D. Darbishire. 

 Journal de Conchyliologie, October [The Editors. 



Mollusca of the 'Challenger' Expedition, xv., by Rev. R. Boog Watson, B.A., 



F.R.S.E. [The Author. 



Proceedings of the Academy of Natural Sciences of Philadelphia, part ii.. May — 



October, 1884. [The Society. 



Enumeratio Molluscorum extramarinomm in Sicilia detectorum, by C. Platania- 



Platania [The Author. 



STRUCTURAL AND SYSTEMATIC CONCHOLOGY ! 



AN INTRODUCTION TO THE STUDY OF THE MOLLUSCA, 



By GEORGE W. TRYON, Jun., 



Conservator of the Conchological Section of the Academy of Natural Sciences of Philadelphia. 



Includes the Anatomy and Physiology of the Mollusca, their Geographical and 

 Geological Distribution, Hints for Collecting and Preserving Specimens, Nomencla- 

 ture and Classification, followed by succinct accounts of all the Recent and Fossil 

 Genera and Subordinate Groups, and two Indices. 



It comprises, in three octavo volumes, about 1,200 pages, illustrated by 140 

 plates, containing over 3,500 figures, and a map ; forming the most complete 

 Conchological Text Book ever published. 



Fine Edition, duplicate plates, coloured and tinted, $45.00. Coloured Edition, 

 $33.00. Uncoloured Edition, $20.00. Cheap Edition, three volumes bound in 

 one, thin paper, $12.00. 



Address : — Geo. W. Tyron, Jun., Academy of Natural Sciences, Philadelphia, 

 U.S.A., or Trubner & Co., 57 & 59, Ludgate Hill, London, England. 



THE SCOTTISH NATURALIST, 



A QUARTERLY MAGAZINE OF NATURAL SCIENCE. 

 Edited by Professor Trail, Aberdeen. 

 Annual Subscriptions, payable in advance, 4s. 6d. , post free. 

 Articles and communications for the Magazine should be sent to the Editor 

 before the ist of December, March, June, or September, if intended for publication 

 in the January, April, July, or October numbers respectively. 



Orders for copies, subscriptions, &c., should be sent to S. CowAN & Co., Perth, 

 from whom also Terms for Advertising may be had. 



HELLS, COLEOPTERA, and LEPIDOPTERA. — Students' 

 Collections scientifically determined, at 10/-, 15/-, 20/-, &c. 

 Very useftil as presents and for beginners. — T. A. Verkruzen, 

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