284 SYSTEMATIC PALEONTOLOGY 



Occurrence. MARTLNSBURG SHALE (Fairview division). Tuscarora 

 Mountain, one and one-half miles southeast of McConnellsburg, Pennsyl- 

 vania. A characteristic fossil of the Pulaski shale of New York and of 

 the corresponding horizon (Fairview division of the Maysville group) 

 in the Ohio Valley. 



Collection. -U. S. National Museum. 



Genus ALLONYCHIA Ulrich 



ALLONYCHIA OVATA Ulrich 



Plate LVII, Fig. 27 



Allonychia ovata Ulrich, 1893, Geol. Surv. Ohio, vol. vii, p. 642, pi. xlviii, 

 figs. 4-6. 



Description. Shell large, 55 mm. in length and 36 mm. wide, subovate 

 but almost erect, strongly convex. Hinge line short not alated posteriorly 

 with the beaks large, incurved and not terminal. Surface marked with 

 40 to 45 radially arranged costae. Hinge line short, edentulous, with a 

 high ligamental area. 



A fairly well preserved cast in sandstone from Tuscarora Mountain, 

 Pennsylvania, exhibited all the characters of this well-marked species. 



Occurrence. MARTINSBURG SHALE (Fairview division). Tuscarora 

 Mountain, one and one-half miles southeast of McConnellsburg, Penn- 

 sylvania. Upper part of Fairview formation at Covington, Kentucky. 



Collection. U. S. National Museum. 



Family AV1CUL1DAE 



Genus PTERINEA Goldfuss 



PTERINEA (CARITODENS) DEMISSA (Conrad) 



Plate LVII, Fig. 24 



Avicula demissa Conrad, 1842, Jour. Acad. Nat. Sci. Philadelphia, vol. viii, 



p. 242, pi. xiii, figs. 3. 



Avicula demissa Hall, 1847, Pal. New York, vol. i, p. 292, pi. Ixxxix, fig. 2a, b. 

 Pterinea demissa Hall and Whitfield, 1875, Geol. Surv. Ohio, Pal., vol. ii, 



p. 78, pi. ii, fig. 1. 

 Caritodens demissa Foerste, 1914, Bull. Sci. Lab. Denison Univ., vol. xvii, 



p. 269, pi. i, figs. 10, pi. 3, fig. 11. 



