^2 Bulletin of Laboratories of Denison JJjiiversity [Voi. xi. 
Schizophoria propinqua. H., Spirifera gregaria. Clapp., Spir- 
ifera macrothyris. H., Spirifera manni. H., Spirifera varicosa 
(?) H., Stropheodonta concava. H., Stropheodonta demissa. . 
Con., Stropheodonta inequiradiata. H., Stropheodonta pater- 
soni. H., Stropheodonta perplana. Con. 
Lamellibranchiata. Conocardium cuneus. Con., Modio- 
morpha perovata. M & W. , Mytilarca ponderosa. H., Para- 
cyclas elliptica. H., Paracyclas lirata. Con., Pterinea pinguis. 
H., Sanguinolites (?) sanduskyensis (?) M. 
Gastropoda. Bellerophon pelops. H., Euomphalus dec- 
ewi. Bill., Loxonema pexata. H., Loxonema bellatulum. H., 
Callonema lichas. H., Pleurotomaria lucina. H., Turbo kear- 
neyi., Turbo shumardi. Vern. 
Cephalopoda. Gomphoceras sp., Gyroceras Columbiense. 
Whit., Orthoceras profundum (?) H. 
Crustacea. Dalmanites bifidus. H., Dalmanites calypso. 
H., Dalmanites aspectans. Con., Phacops cristata. PI. 
This fauna is characterized by the abundance of lamelli- 
branchs and gastropods and the comparative rarity of corals. 
The absence of the common species Eridophylluni verneidlan- 
um, Nucleocrinus verneidli, Leptaena rhomboidalis, and Spirifera 
acuminata., all of which are found at Marble Cliff and Columbus 
a short distance below the bone-bed, indicates that the upper 
part of the Columbus division is absent, while the presence of 
many species found in the lower part of this division indicates 
that that portion of the Marble Cliff section is present. The 
abundance of gastropods denotes that the base of the Marble 
Cliff section is here well represented. 
DELAWARE. 
This fauna was collected from the higher of the two chief 
divisions of the Ohio Corniferous, and consequently lay above 
the bone-bed. Because of their dark blue color the strata make 
a striking contrast with the underlying division. The forma- 
tion is thinner bedded than the one belowL As the section on 
the Plate IV shows, several beds of impure shaly lime- 
stone are found. These with the dark color of the rock render 
