32 Remarks on the Trilobite. 
ness of perfect adaptation to the uses and condition of the class 
of creatures, to which this kind of eye has ever been, and is still 
appropriate. 7 
“If we should discover a microscope, or telescope, in the hand 
of an Egyptian mummy, or beneath the ruins of Herculaneum, it 
would be impossible to deny that a knowledge of the principles 
of optics existed in the mind by which such an instrument. has 
been contrived. The same inference follows, but with cumula- 
tive force, when we see nearly four hundred microscopic lenses 
set side by side, in the compound eye of a fossil trilobite; and 
the weight of the argument is multiplied a thousand fold, when 
we look to the infinite variety of adaptations by which similar 
instruments have been modified, through endless genera and spe- 
cies, from the long lost trilobites, of the transition strata, through 
the extinct crustaceans of the secondary and tertiary formations, 
and thence onward throughout existing crustaceans, and the 
countless hosts of living insects. 
“Tt appears impossible to resist the emolaniatee as to unity of 
ign ina common Author, which are thus attested by such cu- 
mulative evidences of Creative Intelligence and Power ; both, as 
infinitely surpassing the most exalted faculties of the human 
mind, as the mechanisms of the natural world, when magnified 
by the highest microscopes, are found to transcend the most per- 
fect productions of human art.” 
We now proceed to the more immediate object of this commu- 
nication, which is to describe a portion of the under side of the 
fossil animal, which we have named in our monograph calymene 
ufo. 
Some time since, my attention was directed by Dr. J. J. Cohen, 
of Baltimore, to a number of fragments of the heads of this spe- 
cies, obtained from the vicinity of Berkley, Va., 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 perfect 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 ex- 
hibited the under side or thorax, in quite a perfect state of pre- 
servation. All the fragments have precisely the same structure, 80 
that there can be no doubt, we have now the external configura- 
tion of the entire head or buckler of the calymene bufo. 
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