The Rogers Gap Fauna of Central Kentucky 127 



of its existence at 59.1 from Ludlow is preserved. Here it is 

 very common, and this probably was the type locality. No species 

 of Heterotrypa is known from the Economy or Southgate divisions 

 of the Eden at Cincinnati, if the validity of the genus Dekayella 

 is maintained. 



9 — Perenopora vera, Ulrich. A Perenopora of large size is 

 abundant at many localities near Rogers Gap, including those at 

 59.1 and 58.8 miles from Ludlow. It occurs at all localities be- 

 tween 58.3 and Sadieville. Perenopora vera is an Eden and lower 

 Maysville form. The forms below the Fulton layer may belong 

 to a different species. Perenopora milleri was described by Nickles 

 from the Greendale bed along an abandoned railroad belt line in 

 the northeastern part of Lexington, Kentucky. 



Monotrypa subglobosa, Ulrich, EscJiaropora falciformis, Nich- 

 olson, and Arthropora cleavelandi, James, were identified from 

 the strata at Rogers Gap before it was known that these strata 

 belong stratigraphically below the Eden formation. Since they 

 all are Eden forms, it is necessary that the forms thus identified 

 from the Rogers Gap beds be subjected to further study. In the 

 meantime, it is evident that forms at least closely related to these 

 species exist also in the lower beds, as exposed at Rogers Gap. 



10 — Lingula cf. cincinnatiensis, Hall and Whitfield (Plate II, 

 Figs. 2, 3) . The brachial valve of Lingula cincinnatiensis is charac- 

 terized by four slightly convex cuneiform concrete lateral scars. 

 The anterior part of the middle pair may correspond to the central 

 scars of other species. The outer pair is narrower and less distinctly 

 defined laterally. The median septum extends beyond the central 

 scars to within two-fifths the length of the shell from the anterior 

 margin, becoming high and sharply angular on top. A fragment 

 of a shell, evidently belonging to the same section of the genus, 

 was found at the railroad cut 59.1 miles south of Ludlow. Enough 

 remains to show the presence of a very strong median septum, 

 about a millimeter in height, terminating abruptly 5 mm. in front 

 of the deeply impressed central scars. The thickness from valve 

 to valve is 6 mm., and the width 20 mm. The shell is whitish, 

 pearly, and concentrically striated. The concentric striae are more 



23 



