96 Tin American Geologist. August, 1893 
been covered orfilled with a horny sheath like thai of a tur- 
tle. 15m the discovery of conical, blunt teeth in connection 
with these jaws leaves scarcely room to doubt that they were 
set in the alveolus above mentioned. This is unusual in fishes, 
but is at the same time a character frequently seen in rep- 
tiles and may indicate the intermediate nature and position of 
these creatures. 
What then was the probable food of Titanichthys? Some 
day perhaps his fossil stomach may be found to tell the tale, 
as has happened with more than one <d' our extinct predeces- 
sors on earth. Hut we may in the meantime hazard a few 
suppositions. The waters of the Cleveland shale abounded in 
sharks. To a creature witli the armour of Titanichthys the 
teetli of even the most formidable of these would be harmless 
and many of them may have fallen victims to his huge jaws. 
But it may be replied, and with at least a show of reason. 
that so ponderous a brute could never catch the nimble but 
unarmed elasmobranch. Possibly the objection is fatal to the 
supposition. But we do not know the locomotive organs of 
Titanichthys. The huge iron-clads of to-day are not among 
the slowest of ships. And sometimes the nimble may be 
taken by the craft of the slow. The race is not always to the 
swift. 
Furthermore the sharks above alluded to must have preyed 
on some other of the finny tribes. We have the stomach of 
one in which lies a half digested ganoid fish of unknown ge- 
nus and species, indicating to us the existence at that day of 
other fishes whose relics we have not seen, and reminding us 
of our deep, deep ignorance of the life of the Devonian seas. 
To this ignorance we may safely appeal for the solution of 
these enigmas, and we must yet grope for many a day through 
the mist and darkness before we can repeople these seas with 
their ancient population or call before our mind's eye all the 
fishes that then lorded it over the rest of creation. 
The third and last number of this remarkable trio surpasses 
even the first in the formibable nature anil strength of its of- 
fensive weapons. It was but recently discovered and the 
specimen is not yet cleared from the matrix. The jaws, how- 
ever, are quite enough to prove its character and differentiate 
it at once from both Dinichthys and Titanichthys. Rivaling the 
