CoUccfio)! of .Ifol/iisca . . 13 



Dr. Paul Fischer's Manual de Conchyliologie, Paris, V. vSavy, 1888, 

 for reference. Though like all manuals it is behind the times in 

 some parts of its classification, yet it contains an enormous volume 

 of facts and man>- illustrations. It is almost indispensable as a 

 book of reference and costs onl}- some thirty francs. 



To supplement Tryon's Manvial, which does not cover the 

 bivalves or the fresh water and terrestrial pedlinibranch gastro- 

 pods, probably the be.st iconography is the new edition of Chem- 

 nitz" Conchylien Cabinet, edited by Dr. W. Kobelt. 



As a work giving the latest information on the anatomical 

 side the best is the new edition of Bronn's Klassen und Ordnungen 

 der Thierreichs, Molluska, edited by Dr. H. Simroth. The pos- 

 session of these three works will put the library in a position to 

 meet any demands from students which are likely to be made on it 

 for some years to come. 



\"ery respecflfully, 



\VM. H. DAI.I., 

 Palaeontologist U. S. Geol. Survey: Cur. Dept. Mollusks, 

 U. S. Nat. Mus., Washington, D. C. 



Dr. Dall, who at the conclusion of his ^•isit met the Trustees 

 and accepted the title of Honorary Curator of Mollusca, prepared 

 a completely corrected list, in which all changes of name to suit 

 modern views are noted, and the material so arranged that it will 

 be possible to print the catalogue of what, in the opinion of Dr. 

 Dall, is a remarkably good collecT:ion, especially in the shells of 

 the Pacific Region. When these changes can be adopted and new 

 labels printed we shall have nearly 10,000 species arranged in the 

 most modern way. The duplicates are being arranged to facilitate 

 exchanges, but the native Achatinellidae, Avhich are most in de- 

 mand, we have not enough of for exchanges, nor can the\- be prop- 

 erlv determined until Messrs. Sykes in London and Pilsbry in 

 Philadelphia, who are now stud3'ing the family, shall have given 

 us the result of their labors which will doubtless relegate many of 

 the present species to the rank of varieties. The list of acce.s.sions 

 in this Department will appear later on . 



