IS 
HOW TO TRACE THE CLASSIFICATION. 
On entering the room turn to the left, and in following along the 
cases follow the geological succession from the lowest, or oldest 
formation, in Case a, around the room to the top, or newest 
of the American series in Case q ; beyond which European and 
other fossils are arranged. The Geological Epochs are marked by 
signs suspended in the cases at the beginning of the series repre- 
senting that epoch, and are arranged in regular order from Case a, 
in the order given in the Tabular Section, pages 1 1 and 12, begin- 
ning with the lowest, 1, Archaean, and following around the room, 
always reading from left to right. The lower four shelves contain 
the fossils, and the two upper, rock specimens illustrating it. The 
classification of the fossils is indicated by printed labels, giving 
the name of the division under it, with its meaning ; the size of 
the type indicating the rank of the division. The species labels 
are placed within the trays or over them, and are written labels. 
The arrangement is as yet only partially made, and where not 
fully completed, the written specific labels only are given under 
each division,* but where complete, contain the generic and spe- 
cific name of the specimens under it, the name of the author of 
the species, a reference to the work or volume where published, if 
a type or figured specimen, and the locality where obtained ; the 
geological formation being indicated by the epoch sign under 
which it is arranged, or sometimes on the label itself, as follows : 
No. (TYPE) AM. MUS, NAT. HIST. Hall, Call. 
DencLi^ocriTLVLS lorhgidcLclylixs, JTa.ll. 
Pal. JV: Y. Vol. 3, p. 193, PI. 43, Jig. 1 a-te. 
JSTixtgara group. 
Loclzport, IV. Y~. 
The classification is further indicated by strips of colored wood, 
separating the fossils of a division from the next, as follows. A 
•The complete arrangement of the collections will be made as rapidly as possible, but will 
require considerable time ; preliminary labels will, therefore, be placed with the species as fast 
as the cases can be finished. Persons wishing special information about certain forms, can apply 
to the Curator. 
