100 PALEONTOLOGY OF OHIO. 



been part of a drifted or loose piece. From the upper part of the Hudson River 

 group, at Fayetteville, Brown county, Ohio. Collection of S. T. Carley, Esq., for- 

 merly of Cincinnati. 



Orthoceras turbidum (n. sp.). 



Plate 3, fig. 1. 



Shell of moderate size and very gradually tapering ; septa not very 

 closely arranged — four, or a little less than four, of them occupying the 

 space of an inch where the diameter of the shell is one and a quarter 

 inches; on the specimen used for description, which has been somewhat 

 flattened accidentally, giving a slightly increased width. Septa moder- 

 ately concave ; siphuncle unknown. 



Surface marked by low, rounded, longitudinal ridges, about four and a 

 half to five of which occur in the space of half an inch. 



The fragment from which the description is taken, and which is, so far, 

 the only specimen known, is somewhat compressed, so that the spaces 

 representing the chambers are slightly displaced and otherwise dis- 

 torted, so that the entire characters of the species can not be deter- 

 mined. But the surface features of the shell are so distinctive and so 

 unlike any others from this horizon that it can not be readily confounded 

 with them. 



Formation and locality : In the shales of the Hudson River group, at Cincinnati. 

 Collection of U. P. James, Esq. 



Genus GOMPHOCERAS, Sowerby, 

 GOMPHOCERAS EOS (ll. sp.). 



Plate 3, fig. 5. 



Shell rather above the medium size, ovoid in form, somewhat tapering 

 from below upward to the middle of the outer chamber, and as rapidly 

 contracting above. Outer chamber apparently forming fully one-third of 

 the entire length of the shell, judging from the form of that portion pre- 

 served in the specimen, the whole being of an elongate ovate form. 

 Septa deeply concave, and arranged at about one-fifth of an inch distant 

 from each other. Siphuncle not satisfactorily determined. Surface of 

 shell and form of aperture unknown. 



The specimen from which the description is taken is quite imperfect 



