380 The American Geologist. December, 1894 
rently somewhat crushed inward, thereby narrowing the alve- 
olus to the same amount. 
The syniphysial part of the jaw is but slightly injured, and 
its appearance strongly suggests an intermandibular bone or 
cartilage. The symphysial surface retreats rapidly upward, 
so that the lower point is the most prominent. The bone is 
very massive even to the end, differing in this respect strik- 
ingly from the corresponding bone of Titanichthys. It is 
nearly an inch thick at the thinnest part under the alveolus 
and often exceeds this measurement. 
It is almost impossible to doubt that this deep alveolus once 
carried one or more strong teeth, as was the case with Titan- 
ichthys : but as no trace of such organs was met with, we 
can only at present speculate on this point. 
At the bend of the jaw the bone measures two inches in 
thickness. Inferiorly the edge of the jaw is sharp along its 
whole length, smooth in its hinder portion, but slightly rough 
and somewhat tuberculated in front. 
The peculiar bend of the jaw may excite a suspicion that 
some degree of fracture has taken place during fossilization, 
and that the figure does not therefore represent the true form. 
But, in addition to the fact that the bone shows no sign of 
fracture in that place, we may add that the fossil occurred in 
a rather unusual position, not lying flat in the shale but set 
on edge, so that fracture in the direction supposed is quite 
impossible. 
The generic name is taken from the mythologic term 
BpovTt/g, one of the Cyclopes; and the honor of the specific 
name is only a just tribute to the industry and perseverance 
of its discoverer, Dr. W. Clark, of Berea, Ohio. 
GEOLOGICAL HISTORY OF THE MISSOURI 
PALEOZOIC. 
By (i. C. Broadhead. Columbia. Mo. 
The Missouri Paleozoic rocks, in their average surface de- 
velopment, include : 
Upper Carboniferous 2,000 feet. 
Lower ( larboniferous to the base of the Burling- 
ton 1.100 
