The Rogers Gap Fauna of Central Kentucky 139 



of Lophospira bicincta, but the peripheral angle is more prominent. 



34 — Liospira vitruvia, Billings — This species is referred pro- 

 visionally to Liospira zntruvia on account of the frequency with 

 which the umbilical cavity is exposed in the casts at hand. The 

 specimens usually do not exceed 15 mm. in diameter, and nothing 

 is known of the surface striations. The species is common at the 

 railroad cut 59.1 miles from Ludlow, and occurs also at 60.3, 59.7, 

 and 54.3 miles from Ludlow. The most striking feature of this 

 species is the relatively deep and wide sutural depression shown 

 by the casts of the interior, especially in case of the last whorl, the 

 slope changing abruptly a short distance from the suture, produc- 

 ing, in the cast, an angular ridge on the side away from the apex 

 of the shell, the curvature on the apical side being more rounded. 

 Liospira vitrjivia is figured on plate 69 of the Geology of Minne- 

 sota, volume 3. 



35 — Hormotoma gracilis, Hall (Plate I, Fig. 3) — Specimens 

 having the apical angle and oblique whorls of the variety suh- 

 laxa, as figured by Ulrich, occur at the railroad cut 59.1 miles 

 from Ludlow. Unfortunately they are only casts of the interior, 

 and the surface stride are unknown. 



36 — Holopea mcerta, sp. nov. (Plate I, Fig. 4) — This spe- 

 cies most closely resembles in form Holopea concinnula, L^lrich 

 and Scofield, and differ chiefly in the last volution or body whorl 

 being relatively of less height, approaching in this respect Holo- 

 pea excelsa, of the same authors, which is, however, a much taller 

 and larger shell. The types occur at the railroad cut 59.1 miles 

 from Ludlow, and similar specimens were found apparently also 

 at 54.2. 



37 — Cycloneina varicosum-cincinnatcnse, Miller (Plate I, 

 Fig. 12A, B) — This variety differs from varicosuni chiefly in its 

 smaller size ; it is characterized by the strong and comparatively 

 equidistant transverse stride, which number about 5 to 7, occasion- 

 ally 8, in a w^idth of 2 mm. along the periphery of the largest or 

 body whorl. Revolving carinae of that part of the whorl which 

 remains above the suture line are rather strong; of these the one 



35 



