. Annual report of the Regents. New York State Museum; Science. NIAGARA FALLS AND ViCiNlTY 213 Pleurotomaria pervetusta (Conrad) (Fig. 143) (1852. Pal N. F. 2:12, pi. 4 (bis)) Distinguishing characters. Small size; depressed conic spire, the volutions strongly embracing; whorls about four, gradually enlarging; large um- bilicus extending to the apex. Found in the upper Medina sandstones of the Niagara sections. Also at Lockport (Hall). Genus bucania Hall [Ety.: bucina, a trumpet] (1847. Pal' A', y- I -32) Shells coiled, a single plane, with the spire equally concave on either side and 11 ^1 1
. Annual report of the Regents. New York State Museum; Science. NIAGARA FALLS AND ViCiNlTY 213 Pleurotomaria pervetusta (Conrad) (Fig. 143) (1852. Pal N. F. 2:12, pi. 4 (bis)) Distinguishing characters. Small size; depressed conic spire, the volutions strongly embracing; whorls about four, gradually enlarging; large um- bilicus extending to the apex. Found in the upper Medina sandstones of the Niagara sections. Also at Lockport (Hall). Genus bucania Hall [Ety.: bucina, a trumpet] (1847. Pal' A', y- I -32) Shells coiled, a single plane, with the spire equally concave on either side and 11 ^1 1 . -Ml 1 , Fig. 143 Pleurotomaria pervetusta all the volutions visible; outer whorl ven- tricose; all whorls embracing to some extent, having an inner con- cavity; aperture rounded, oval, somewhat compressed on the inner side from contact with preceding whorl. Bucania trilobata (Conrad) (Fig. 144) (Hall. 1852. Pal. N. Y. 2:13, Pl- 4 (bis)) Distinguishing characters. Suborbicular form; three- Pig. 144 Bucania lobcd volutious, all of which are visible; last whorl trilobata greatly expanded; aperture wider than long. Found at Medina and Lockport and fragments in the upper Medina of Niagara indicate its presence there. Class CONULARIDA Paleozoic mollusks of doubtful systematic position, resembhng some modern Pteropoda, but only distantly and ancestrally related to them. Shells conic or tubular, elongate, septate and variously ornamented. Genus conularia Miller [Ety.: diminutive of conus, a cone] (1821. Sowerby. Mineral conchology, 3:107) Shell elongated, pyramidal, with the transverse section varying from quadrangular to octagonal; angles indented by longitudinal grooves. The surface is variously ornamented by transverse or Q. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; University of th
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