Cincinnatian and Lexington Fossils 75, 



Orthoccras hammelli occurs at the Wallace Horrell locality, 5 

 miles south of Hanover. Smaller fragments of the same species 

 occur in the Hitz layer, at the top of the Saluda bed, at Madison, 

 Indiana; and two miles east of Tucker, in Jefferson county, Ken- 

 tucky, at the overhead bridge, crossing the Southern Railroad. In 

 these specimens the primary longitudinal striations are conspicuous- 

 ly stronger than the intermediate ones. 



Specimens of Orthoceras hammelli of about the same size as 

 the type specimen occur at numerous localities in the "mottled" 

 limestone, forming the upper part of the Saluda section in many 

 parts of southeastern Indiana. It occurs at this horizon at the 

 railroad cut west of Weisburg, 16 feet above the "shale bed," asso- 

 ciated with Entomis madisonensis , Eurychilina striatomarginata^ 

 Leper ditia caecigena, Primitia cincinnaticnsis, and Primitia millcri. 

 At the creek, east of Ballstown, in Ripley county, Indiana, Ortho- 

 ceras hammelli occurs within 5 feet above the massive Tetradium 

 layer, at the base of the Saluda bed. A mile and a half northeast 

 of Enochsburg, in Franklin county, a specimen was found loose at 

 the Saluda horizon, 15 feet above Big Salt creek. 



A large specimen, 36 mm. in diameter, was found in the Elk- 

 horn bed, at West Milton, Ohio. In this specimen the primary 

 longitudinal striations occur at intervals of about 3 mm. The 

 median secondary striations are inconspicuous, and the intermedi- 

 ate striations can be seen only under a lens. 



Compared with Orthoccras gorhyi. Miller, the septa are more 

 remote, and the annulations are either directly transverse or only 

 moderately oblique. Compared with Orthoccras perroti, the an- 

 nulations are much less prominent, and the longitudinal striae are 

 never very conspicuous or developed into lamellar expansions. 



Orthoceras (Spyroceras) bilineatum-frankfortensis, sp. nov. 



(Plate I, figs. 6 A. B.) 



South of Glenn creek, at the Crow distillery, 6 miles southeast 

 of Frankfort, Kentucky, the Logana bed, with Hcterorthis clytie, 

 is well exposed. The underlying cherty limestone, containing 

 Orthis tviccnaria, is referred by Prof. Arthur M. Miller to the 

 Curdsville bed. This cherty limestone contains a species of Ortho- 

 ccras characterized by low, transverse annulations, rising scarcely 

 half a millimeter above the flat, intermediate grooves. There are 

 7 annulations in a length of 22 mm. in a specimen about 22 mm. 

 wide. The annulations are crossed by sharp, longitudinal striae. 



