XVIII PREFACE. 



bericht for 1879, not otherwise given; 3d, all genera, whether previously 

 recorded correctly or not, which were furnished by the authors them- 

 selves ; and 4th, a few groups higher than genera, most of which were 

 furnished by correspondents, and therefore not expunged; no attempt 

 has been made to collect these, and they are distinguished from the 

 genera by being hair- spaced. Where the entry has been furnished 

 by an author or other correspondent his name is appended in italic* as 

 its sponsor; the name Agassiz is appended to all entries copied from his 

 manuscript additions to the Nomenclator of 184G; for all entries contain- 

 ing no final italicized name the compiler is responsible, but as many of 

 these have, of course, been taken at second hand, it will be best in all 

 doubtful or critical cases to verify them. That the list is far from being 

 fully complementary the compiler has had ample proofs since the com- 

 pletion of the appendix. When, indeed, such common generic names as 

 Homo and Musca have escaped entry until now, he cannot anticipate 

 that he has been much more successful than his predecessors. 



The second part, or u Universal Index," containing, with its cross- 

 references, about 80,000 entries, includes all names appearing either in 

 the first part of the present work, or in the nomenclators of Agassiz and. 

 Marschall, or in the indexes of the Zoological Record through that for 

 the year 1877. A single letter refers to the place where a fuller account 

 will be found, the Z having an abbreviated form of the year appended to 

 indicate the volume of the Zoological Record. The list gives the names 

 in clear type but in the most compact form, in order that as many names 

 as possible shall be before the eye at once, a prime requisite in an index. 

 There is given: 1st, the name of the genus (including also, in italics, such 

 family or higher names as appear in Agassiz's Noinenclator or my Sup- 

 plemental List); 2d, the authority; 3d, the group; 4th, the date; and 

 5th, the reference to the nomenclators. No critical marks are appended, 

 as was at first intended, as judgment in such matters varies too much to 

 render it desirable, considering the labor involved; the material for 

 judgment is all that should be expected of the compiler. For conven- 

 ience, an edition of each part will be issued separately. 



Finally, the compiler expresses the hope that the work may be found 

 tolerably accurate. To the excellent proof-readers of the Government 

 Printing Office much of the credit is due for what freedom it has from 

 typographical faults and inconsistencies, but every word of the proof has 

 been read by the compiler himself many times with utmost care. If it 

 shall be found as useful to the student as he hopes, the dreary work 

 of its preparation will be looked upon with satisfaction. 



SAMUEL H. SCUDDER. 

 HARVARD COLLEGE LIBRARY, 



Cambridge, Mass., March 31, 1882. 



