19 
and which are still preserved in his cabinet. 
Three or four of these fragments seemed to 
disclose the configuration of the whole lower 
surface of the buckler, in a more or less per¬ 
fect state. Within a few months, another 
friend brought for my examination a fine 
large head of the same species, from the same 
locality, and which exhibited the under side 
or thorax in quite a perfect state of preserva¬ 
tion. All the fragments have precisely the 
same structure, so that there can be no doubt, 
we have now the external configuration of the 
entire head or buckler of the calymene bufo. 
The anterior edge of the buckler of this 
species, as has been often observed, is marked 
by a deep groove or furrow, produced ap¬ 
parently by the junction of the upper and 
the under shell at this place, and which at first 
sight looks like the mouthy of the animal; in¬ 
deed, Professor Brongniart calls the elevated 
ridges on each side of this groove the lips. 
The mouth was, however, placed no doubt 
much farther beneath. These Zips, perhaps, 
indicate the separation of the shell, through 
