240 The American Geologist. October, 1903. 
above the larger plates over the dome of the theca. In differ- 
ent individuals one finds nearly every stage of progression 
from the non-stellate form to those very prominently stellate. 
Young or small specimens of C. ulrichi have the depressed 
form with the large and not sharply delimited basal area of C. 
stellatus showing progressive development towards a more bal- 
loon-shaped theca with a pinched and restricted basal termina- 
tion. The largest known specimen has a diameter of 12 cm. 
Formation and locality. — Very common in the lower portion 
of the Helderbergian (Hunton formation) of Indian Territory 
where Mr. Ulrich found specimens at many localities for a dis- 
tance of fifty miles. Some of the best localities are 3 miles 
north-east and 4 miles south of Daugherty, and \]/% miles and 
2 miles south of Franks. 
It gives the writer great pleasure to name this species for 
its discoverer, Mr. E. O. Ulrich, one of America's most dis- 
tinguished paleontologists and an indefatigable collector. 
Cat. numbers 35,082 — 35,085. U. S. N. M. 
THE DEVONIAN ERA IN THE OHIO BASIN.* 
By Edward W. Clayvole. 
Part II. 
DEVONIAN PALAEONTOLOGY OF THE 
APPALACHIAN GULF. 
The full consideration of the palaeontology of the whole 
area of the Appalachian sea during the Devonian era would in- 
clude a study of all the work that has been done in New York 
and the other eastern states as a standard of comparison, and 
then similar study of the fossils of the other portions of the ba- 
sin west and south. Obviously the result would be a treatise far 
exceeding the necessary limits of this essay. But an attempt 
will be made to treat with reasonable fullness some of the prob- 
lems and to give in due detail some of the facts connected with 
the Devonian history of Appalachian life. It will, therefore, 
be convenient to treat our subject succinctly under the nine 
main headings which follow. 
* Continued from page 105. 
