FEATHERED FORMS OF OTHER DAYS. 
353 
ARCH/EOPTERYX LITHOGRAPHICA. 
(FROM A PHOTOGRAPH, TAKEN FOR “THE CENTURY,” OF THE SLAB IN THE BRITISH MUSEUM.) 
another, and the hope was entertained that 
Emperor William would secure the treasure 
for Germany, but he, like many a crowned 
head before him, could not appreciate its value. 
“Ah!” as Professor Carl Vogt exclaims, “if 
instead of a bird a petrified cannon or gun 
had been concerned! ” It is from Professor 
Vogt’s article in the “Ibis” of October, 1880, 
that I am enabled to give a drawing of this 
creature as it lies in the slab. The illus- 
tration in the “ Ibis,” however, is a reduced 
photograph taken directly from the specimen ; 
so I did not pretend to copy the many deli- 
cate little excavations made by the skillful 
hammer and chisel of Plerr Haberlein, though 
otherwise my drawing is correct, and gives a 
good idea of the specimen. 
1 hree examples of Arcluzoptcryx exist, then, 
Vol. XXXI. — 35. 
or rather had been discovered up to our time : 
the single feather of Von Meyer; the British 
Museum specimen, which is the one described 
by Professor Owen, and which had attained 
a size about equal to that of our crow ; and 
lastly, the one described by Professor Vogt 
in the “ Ibis.” The latter specimen I have 
since ascertained is now in the Museum at 
Berlin. It is about one-fifth smaller than the 
British Museum specimen, being about the 
size of a ring-dove. 
The feature that first attracts the attention 
both of the layman and of the scientific man, 
as he views the picture of the fossil remains 
of this form for the first time, is the extraordi- 
nary tail. This remarkable appendage con- 
sisted of twenty vertebra;, or joints, each one 
of which bore a pair of perfect rectrices or 
