21 



REPORT ON THE CRUSTACEA. 



By Walter Faxon. 



Since the last annual report, as much of my time as was not 

 demanded by other duties has been employed in arranging and 

 cataloguing the Crustacea of the " Blake" Expeditions of 1877— 

 78 and 1878-79, together with other collections comprising many 

 type specimens. Much of the value of the carcinological material 

 in this Museum comes from the large number of authors' types 

 contained therein. I have therefore thought it advisable, pending 

 the revision and determination of the whole collection, to select 

 such " type " collections, and carefully number and catalogue the 

 specimens, thus ensuring them against loss of labels and at the 

 same time rendering them easy of access for comparison. Among 

 the collections embracing types or specimens equally authorita- 

 tive, from being labelled by the describers of the species, may be 

 mentioned : — Astacidas from Georgia, described by John Le 

 Conte in 1855 ; Crustacea from the Wilkes United States Ex- 

 ploring Expedition, named by Dana ; types of Stimpson's species 

 from the east and west coasts of the United States, and from the 

 United States North Pacific Exploring Expedition ; types of the 

 species described by Ordway in his monograph of the genus Cal- 

 linectes ; Hagen, in Monograph of North American Astacidae ; 

 Packard, Phyllopoda ; Faxon, Crustacea of Lake Titicaca ; fresh- 

 water Crustacea from the United States, described by S. I. 

 Smith and 0. Harger ; Birge's species of North American Cla- 

 docera ; Cymothoids described by Schiodte and Meinert ; deep- 

 sea Crustacea of the " Bache," " Hassler " and " Blake " Expe- 

 ditions, described by A. Milne Edwards, S. I. Smith, and E. B. 

 Wilson (Pycnogonida). 



Among the noteworthy additions to the collection, during the 

 year, are fine specimens of Astacopsis serratus Haswell and Pali- 



