1876.] 



SENATE— No. 10. 



25 



nently successful. It not only preserves the thin and tender 

 shells from injury, but also obviates one great objection con- 

 stantly brought against mounting shells on tablets, since this 

 plan admits of all sides of a specimen being examined without 

 removal, and is moreover particularly adapted to the minuter 

 forms. 



Our usual exchanges have been continued, though the 

 number of packages and specimens received or sent away has 

 scarcely been as great as in many previous years. Our col- 

 lection being so large already, we have had no inducement or 

 wish to solicit miscellaneous or indiscriminate exchanges, and 

 hence we have in all cases restricted correspondents to such 

 forms as would furnish us with new or specially desirable 

 species, and have particularly sought for type specimens from 

 authors engaged in describing new species. During the year 

 we have received from 24 contributors 27 packages, containing 

 1,192 species and 13,683 specimens. Many of these were rare 

 types, sent by authors, or else species seldom attainable, and 

 hence of unusual value. 



Some of the parcels received deserve more than a passing 

 notice. Among these I may mention two packages from Mons. 

 A. Morelet, containing mostly species described by him, and 

 derived from localities seldom visited by collectors. 



Our old correspondent. Dr. Dohrn, from whom we have 

 hitherto received so many favors, has again laid us under obli- 

 gations, by furnishing many rare and choice species from 

 Morocco, the Red Sea, Bolivia, and Ecuador. His last box, 

 just received, contained more than forty species entirely new 

 to me. 



Our friends, Messrs. Garrett, Geale, Bland, Count Kornis, 

 and others, have also kindly remembered us from time to time, 

 sending us valuable contributions, for which we desire to return 

 them our sincere thanks. From the first named we received 

 340 species, all collected by himself, mostly in the Feejee 

 Islands, and the localities being carefully noted renders them 

 unusually valuable. 



The number of packages sent to correspondents has been 

 32, containing 2,125 species and 7,328 specimens, 



4 



