6 PREFACE. 



The zoological collections, althongb comparatively small, contain an 

 unusual number of new genera and species, notably in molluscs, insects, 

 crustaceans, and echinoderms. Descriptions of these have been fur- 

 nished by Profs. Yerrill, S. I. Smith, Dall, Hagen, and Osten-Sacken, 

 and will be found under the appropriate headings. Thanks are due to 

 these gentlemen and to others whose co-operation has added much to 

 the scientific value of this report. 



The Bulletin concludes with a study of Chionis minor, an unique and 

 little-known bird, with an attempt to establish its proper position iu 

 classification. 



J. H. K. 



Smithsonian Institution, 



Washington, B. C, November 1875. 



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