JOURNAL OF CONCHOLOGY. 435 
UPON TEE PRINCIPLES, OF 
NOMENCLATURE, 
INNID) IVBUBIOR, ANP IPICI CNN KOIN INO) Pas, 
GENERA 
OF RECENT MOLLUSCA. 
(The Presidential Address delivered at the Annual Meeting, September roth, 1896). 
By J. COSMO MELVILL, M.A., F.L.S. 
CONTENTS. 
I. Historical Sketch and Summary of Pre-Linnzean Authors 
II. Causes leading to necessary revisions in Zoological Nomen- 
clature. 
III. Heads of the Stricklandian Code 1842. 
IV. Revision of the Stricklandian Code 1864—1866. 
V. Report of the Committee on Zoological Nomenclature to the 
American Association 1877. 
VI. La Société Zoologique de France 1881. 
VII. Comments by various writers on the subject of Nomenclature. 
VIII. Dr. P. L. Sclater, F.R.S, and the Zoological Society of 
London, 1896. F 
IX. Code of the German Zoological Society and Das Tierreich 1896. 
X. List of the Linnzean genera of Shells. 
XI. Genera, about the Nomenclature of which some difference cf 
opinion has existed. 
XII. Observations on particular genera. 
XIII. Three suggested rules for systematists. 
XIV. Summary. 
SEVEN years have elapsed since I last had the honour of 
addressing the Members of this Society from the Presidential 
chair, and in reviewing the interval I have much pleasurable 
satisfaction in noting the steady growth, increase, and general 
vitality pervading not only this community and this Society, 
but likewise kindred institutions whose aim and vazson a’étre 
are identical. 
