The Rogers Gap Fauna of Central Kentucky 137 



30 — Cycloconcha ohlonga, sp. nov. (Plate I, Fig. 6) — The 

 shell figured has a thickness from valve to valve of scarcely 5 mm. 

 If it be a species of Cycloconcha (Orthodontiscus) , it differs from 

 species previously described in its oblong form and the position 

 of the beak nearer the anterior margin. The cardinal outline is 

 comparatively straight, and the basal margin is less curved than 

 in previously described species of the genus. Found at the rail- 

 road cut 59.1 miles from Ludlow. Cycloconcha ovata, Ulrich, 

 occurs in the Southgate and Economy divisions of the Eden, at 

 Cincinnati. 



31 — Fusispira cf. sulcata, Ulrich (Plate III, Figs. 4, 5) — 

 This species, described from Rogers Gap, was founded chiefly 

 upon the presence of several more or less obscure revolving fur- 

 rows on the cast of the interior of the shell used as a type. If 

 these interior furrows are a constant feature, the species has not 

 been found since, during the numerous investigations of the type 

 localities. However, specimens closely agreeing in form, but lack- 

 ing the furrows, are not rare, and possibly may belong to the same 

 species. They are most frequent at the cut 59.1 miles south of 

 Ludlow, but have been found also at 59.8, and at the cut immedi- 

 ately north of Sadieville, north of the railroad bridge. Fusispira 

 sulcata is figured on plate 53 of the Geologv of ^Minnesota, volume 

 III. 



33 — Hormotoma terehriformis, sp. nov. (Plate III, Figs. SA, 

 B) — This species has some resemblance to Hormotoma belli- 

 cincta, Hall, and it is upon this resemblance, in the absence of 

 the surface markings or of the aperture, that the generic reference 

 is based. Compared with Hormotoma hellicincta, from the Tren- 

 ton of New York, however, it is a longer and more slender species. 

 Only casts of the interior are known. The whorls are rather 

 evenly convex. There is no angulation suggesting the location 

 of a peripheral band, as in the augustiua division of the genus 

 Lophospira. In the type specimen, found at the second railroad 

 cut north of Rogers Gap, there is an apical angle of about 20 de- 

 grees ; five whorls are well preserved, the body whorl is imper- 

 fectly indicated ; and at least three whorls are missing at the apical 



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