Strophomena and Other Fossils 
139 
and over the last volution, thus doing away with the winged 
idea. Under these circumstances, I should prefer to wait for a 
specimen showing the remainder of the shell before admitting 
the presence of a broad, lateral flange. 
Orthoceras tyronensis, sp. nov.. 
{Plate X, Figs. 5 A, B) 
In the Tyrone bed at High Bridge, Kentucky, between 24 and 
29 feet below the base of the green clay at the top of the forma- 
tion, the rock is richly fossiliferous. Here the following species 
of Orthoceras is found. 
Orthoceracone with circular section, with the apical angle 
varying from 6 to 10 degrees. On one fragment, 38 mm. in 
length, the diameter at the larger extremity is 11 mm., and 6.5 
mm. at the smaller end. The septa are moderately concave, about 
6 occur in a length of 6.5 mm., where the diameter of the shell is 
7 mm., the siphuncle at this point is linear in form and about 
two-thirds of a millimeter in diameter. 
The surface of the shell probably is smooth, but in all of the 
specimens at hand it is covered by a papillose layer, resembling 
the encrusting growths to which Parks recently has applied the 
term Dermatostroma. This covering sometimes attains a thick- 
ness of half a millimeter in specimens 7 mm. in diameter. Many 
of the papillae are discrete, but frequently they are more or less 
elongate longitudinally, and coalesce into longer or shorter ridges, 
which sometimes are strong and bold, considering the small 
diameter of the shells. For this covering, regarded as an encrust- 
ing growth, the term Dermatostroma tyronensis is suggested. 
Orthoceras tyronensis, with its corticose covering of Dermato- 
stroma tyronensis occurs also 7 miles south of High Bridge, 
nearly 2 miles northwest of Bryantsville, where the road bends 
northward into a ravine. 
Changes in Terminology 
For Schizonema Schizoramma. Type: Schizoramma 
fissistriata. Bulletin, Denison Univ., vol. xiv, p, 76. 
For Bathycoelia substitute Pionodema. Type: Pionodema sub- 
aequata, Conrad. Bulletin, Denison Univ., vol. xiv, p. 221. 
For Cyclocoelia substitute Encuclodema. Type: Encuclodema 
sordida, Hall. Bulletin, Denison Univ., vol. xiv, p. 227. 
