THE 
AMERICAN GEOLOGIST. 
Vol. XIV. SEPTEMBER, 1894. No. 8. 
[Paleontological notes from Blchtel Collecje.— No. 7.] 
CLADODUS ? MAGNIFICUS, A NEW SELACHIAN. 
By E. W. Claypoi.e. Akron. Ohio. 
(Plate V.) 
Among the latest discoveries which have rewarded the per- 
sistent search of the veteran collector, Dr. (lark, is a jaw, or 
rather, a pair of mandibles whose characters are remarkable 
enough to deserve description, even though we at present 
know almost nothing, except by inference, of the animal which 
it represents. 
I have figured the inner surface of one of these in the ac- 
companying plate. The other is, unfortunately, broken across 
and incomplete, yet abundantly sufficient for recognition. 
They were found lying almost free on the surface of a slab of 
shale, in the valley of the Rocky river on the same horizon — 
the Cleveland shale — that has already yielded us so many 
kindred fossils. 
The right ramus, which is the best preserved, and whose in- 
ner face is here figured, will form the basis of the following 
description. So far as it affords characters, these are clear 
and determinate, but. unfortunately, no trace of teeth was 
found, so that it is not possible to affirm whether or not the 
jaw belongs to a cladodont fish. 
h is of very large size, measuring fifteen inches in length 
by three inches and a half in greatest depth. It is a Hat. thin 
plate of hone corrugated along the edge, hut generally not 
exceeding one-eighth of an inch in thickness, though in places 
it may he double this. A well marked hut -hallow f088a for 
the reception of the condyle i- prevent, which laces slightly 
inward as well as upward. In front of this and behind it are 
processes for the attachment of the connecting ligament-. 
