276 The Ohio Naturalist. [Vol. VIII, No. 5, 



Species Columbus Delaware 



Paracyclas clliptica H x 



Pterinea flabellum (Con.) x x 



Bellerophon cf. pelops H x 



Callonema cf. hcllatida (H.) x 



Callaiiema lichas (?) (H.) x 



Loxoitema hamiltoniac H x 



Plenrotomaria liicina H x 



Pleurotomaria sulcomarginata (Con.) x 



Plenrotomaria sp x 



Trochoncma incekamun Aliller x 



Coleoliis tenniciuctiim (?) H x 



Tentacidites bellulus H x 



Tentacnlitcs scalariformis H x 



Gomphoccras pingue (?) H x 



Goniatitcs sp x 



Orthoceras arkenense Whiteaves x 



Orthoceras sp x 



Phacops cristata H x 



Phacops rana (Green) x 



Proetus macroccphalus H x 



Several zones were observed, which carry faunules differing 

 from each other, but available specimens were found to be so 

 much more aVjundant 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 Nos. S and 9 of the 

 section carr_y 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 "" and the layers 

 immediately 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. pjD. 152-159. 

 The University of Chicago. 



