182 REPORT OF NATIONAL MUSEUM, 1884. 



investigation of Chlamydoconcha, a remarkable form of bivalve inollusk, 

 with an internal shell, from California, which proves to be the type of a 

 new family. 



A list of the chief publications by the curator duriug 1884 is appended. 



The number of entries made in the mollusk register during the past 

 year is 5,231, but this is far from indicating the total number of acces- 

 sions, the majority of which have been laid aside to be catalogued later, 

 as occasion serves. 



The total number of molluscan specimens in the possession of the 

 Museum cannot be stated, as fully half of them are not catalogued; but 

 it is safe to estimate them at not less than four hundred thousand, in- 

 cluding duplicates and specimens in spirits. The number of species 

 may approximate twenty thousand, but this is much more uncertain. 

 Several years must elapse before a definite enumeration can be made. 

 The number of entries in the mollusk register is about forty-one thou- 

 sand, but this necessarily includes numerous duplications of the same 

 species from different localities. 



The following accessions have been made to the collection in this de- 

 partment during the year : 

 Adams, S. F., Lakeside, Beadle County, Dakota. Specimens of Planorbis 



trivolvis, from Dakota. 

 Baird, Prof. S. F., Secretary Smithsonian Institution and Director of 



the National Museum. Pearl from Venus mercenaria L., obtained at 



Wood's Holl, Mass., by T. S. Ellis. A remarkably large and fine ex- 

 ample. 

 Beauchamp, Rev. W. 711., Baldwins villa, N. Y. Shells of TJnio, Limncea, 



and Bithinia, from the State of New York. 

 Bloehman, Lucien A., San Diego, Gal. Marine shells (Litorina, Ostrea, 



Cerithidea, &c), from San Diego, Gal. 

 Call, B. Ellsworth, David City, Nebr. Land and fresh-water shells from 



Utah and Nevada, including types of new species, &c. A valuable 



series. 



. Specimens of TJnio Wardii Lea, from Des Moines, Iowa. 



. Specimens of Sphmrium Jayanum and S. transversum, from Des 



Moines. 



Alcoholic specimens of Limax maximus L., from the District of 



Columbia. 



. Twelve species, 127 specimens TJnionidaz, from Des Moines 



River, Iowa. 

 Coleman, W. W., 927 Ninth street, Washington, D. C. Specimen of Lo- 



ligo, from Norfolk, Va. 

 Crawford, Dr. M. R., TJ. S. N., of U. S. S. Shenandoah, JArna, Peru. 



Specimens of mollusks and shells, dry and in alcohol, from latitude 



52° WW south, and longitude 66° 34' west, from the west coast of Tierra 



del Fuego, near the entrance of Magellan Strait. 

 Dale, Dr. F. C. (See Hungerford.) 



