276 
The Ohio Naturalist. 
LVol. VIII, No. 5, 
Species 
Paracyclas elliptica H. 
Pterinea fiabellum (Con.). 
Bellerophon cf. pelops H. 
Callonema cf. bellatula (H.). 
Callanema lichas (?) (H.). 
Loxonema hamiltoniae H. 
Pleurotomaria lucina H. 
Pleurotomaria sulcomarginata (Con.) 
Pleurotomaria sp . 
Trochonema meekanum Miller. 
Coleolus tennicinctum (?) H. 
Tcntaculites bellulus H. 
Tentaculites scalariformis H. 
Gomphoceras pingue (?) H. 
Goniatites sp . 
Orthoceras arkenense Whiteaves. 
Orthoceras sp . 
Phacops cristata H. 
Phacops rana (Green). 
Proetus macrocephalus H. 
Columbus Delaware 
. . . . x 
. . . . X . X 
.X 
.x 
. . . . x 
x 
X 
X 
X 
X 
X 
X 
X 
X 
X 
X 
Several zones were observed, which carry faunules differing 
from each other, but available specimens were found to be so 
much more abundant among the loose rock that most of the col¬ 
lection was made from the material thrown on the bank. On 
account of this manner of collecting, it is impossible to locate the 
above species in their exact horizons, but Xos. 8 and 9 of the 
section carry perhaps three-fourths of the species collected from 
this formation. 
The similarity of these northwestern Delaware beds and their 
fauna to the Hamilton at Thedford, Ontario, rather than to the 
same formation east in Ohio is certainly remarkable. This is 
more evident when we study the coral zone 5 and the layers 
immediatelv associated with it. Such close relationship doubt¬ 
less indicates direct shallow water connection between these Ohio 
and Canadian sections and the center of dispersion of the Tra- 
verse-Hamilton fauna, and, on the other hand, indirect connec¬ 
tion between northwestern and central Ohio during the time of 
their deposition. 
(5) Grabau; Loc. cit. pp. 152-159. 
The University of Chicago. 
