EXPLANATIONS. 
Names of authors and subjects are arranged together alphabetically. 
References to species of animals described or noticed in the Journal, 
though to some extent distributed through the Index, are systemati- 
cally catalogued under the word Zoology. The same plan is followed 
with Botany. 
Obituary notices are collected together under Obituary. 
The references under authors’ names, when numerous, are sometimes 
alphabetized, or distributed according to subjects, but often follow the 
order of the volumes. 
Works reviewed are mentioned under the names of their authors, and 
also under the word Works. 
When an article is illustrated by figures or plates, the fact is noted 
by adding to the number of the page, the letter f. 
A Supplement, (page 317,) is added, containing some omitted refer- 
ences. 
The list of plates and wood cuts, (page 323,) is arranged according 
to volumes, and the page or article is mentioned which each illustrates. 
The numbers in this list indicate the proper order of succession in each 
volume, and not the numbers that may appear on the plates. 
ERRATA. 
Page 14, col. 1, line 24 from bottom, for ‘ Lea,” read “ Lee.” 
36 py ey a GS Bea Sup ptOn BOS, ueadeensoue 
GBR CBB A NG “&- dele “ Barnes, D. W.” 
<0) one A Sifrom) top, tor tloO.) read loweu 
66 CONN Coe 27 CE cl torsos uuned ddlood cde 
ee 98) EOF et)) 4) from botfom), for <<xxxii, read“) xxxil. 
“6156, “ 2, “ 12 and 13 from bottom, dele the lines. 
“185, * 1, “ 16 from bottom, for ‘ xxxiii,”’ read ‘¢ xxiii.” 
GEN Tale GS Th SS IL SG ei for mead eta dirs 
« 212, “ 1, * 12 from top, dele ‘“‘x, 203; xi, 335,”’ and insert the same 
in the 2d line from top. 
Page 287, col. 2, line 21 from top, insert xlui, 390. 
287, “ 2, “ 3 from bottom, insert xxiv, 151. 
ae 
