14 COMPARATIVE ZOOLOGY. [Apr. 



By Exchange. 



Day, Dr. F., 57 species, 60 specimens from Malabar, India. 

 Montes-de-Oca, Rafael, 10 specimens of Xiphophorus hellerii, 

 from Jalapa, Mexico. 



By Purchase. 



Schmeltz, J. D. E., Jr., 22 species, 44 specimens from Lake 

 Baical, Siberia. 



Milner, J. W"., 30 species, many specimens from Sandusky, 

 Ohio. 



Steindachner, Dr. F., a collection from San Francisco, Cal. 



Green, Seth, several specimens and species from Western 

 New York. 



By Purchase and Exchange. 

 Salmin, C. L., 79 species, 175 specimens from the North Sea 

 and the Elbe River. 



Vienna Museum, 33 mounted skeletons. 



Report on the Collection of Mollusks, by John G. Anthony. 



During the present year considerable activity has prevailed 

 in this department, and much has been done to increase its 

 usefulness. 



During the earlier part of the year much attention was 

 paid to exchanges, and a vast amount of material was thus 

 added to our resources for augmenting the collection, and for 

 still further exchanges for future increase. 



The number of packages received by exchange since my 

 last report has been twenty-eight, containing 3,266 species 

 and 37,717 specimens. 



Our resources for exchanges have been largely increased 

 recently by the purchase of an extensive collection of shells, 

 made by the late W. Harper Pease, in the Pacific Islands. 

 This collection has only been in our possession for a few 

 weeks, and hence has been but partially examined, but even 

 that cursory examination has shown that besides adding sev- 

 eral hundred species to our collection, it will afford the means 

 of exchange, to a very great extent, by the large number of 

 duplicates it contains, especially of Partulas, Achatinellas 

 and other genera peculiar to the Polynesian group. 



