PREFACE. XVII 



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It remains only to indicate briefly the plan and scope of the work. 



The first part, or "Supplemental List," includes 15,939 entries of 

 genera established previous to 1880, not recorded or erroneously given 

 in the uomenclators of Agassiz and Marschall, or the Zoological Record 

 indexes. It includes, however, besides these : 1st, the genera of the 

 Zoological Record for 1878 and 1879 (2,133 names, which had not been 

 entered in the MS. of the second part, or Universal Index, at the time of 

 its preparation) ; 2d, the genera in the index of the Zoologischer Jahres- 

 H 



