. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. surfaces variously ornameuted. Aperture sub-(|uadrate to sub-orbicular, the iuner lip tliiu. The outer lip bears a nar- row, deep fissure, or sinus, which is the still unclosed con- tinuation of a revolving- band. Pleukotomaria Hall. (Fig. 207.) (Pnl. N. Y., Vol. v., Pt. II., p. 67, PI. XVlll.) Distinguishing Cliamcters.— Large size; sub-globose, or obliquely ovoid conical form; moderately elevated spire, with minute apex, and a b o u t four volutions ; regularly and r a p i d 1 y expanding body-whorl; e
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. surfaces variously ornameuted. Aperture sub-(|uadrate to sub-orbicular, the iuner lip tliiu. The outer lip bears a nar- row, deep fissure, or sinus, which is the still unclosed con- tinuation of a revolving- band. Pleukotomaria Hall. (Fig. 207.) (Pnl. N. Y., Vol. v., Pt. II., p. 67, PI. XVlll.) Distinguishing Cliamcters.— Large size; sub-globose, or obliquely ovoid conical form; moderately elevated spire, with minute apex, and a b o u t four volutions ; regularly and r a p i d 1 y expanding body-whorl; expanded, nearly round, a]iertures. with shallow notch: neatly defined, slightly canaliculate su- ture ; moderately w id e „ .,,. ,„ , 1 ^^ , revolving band, limited Fig. 20i. l'li_ ii,"tlA'nno' TTr1o'P».j iw\ Clarence Hollow : the specimens fr .m the Hamilton ^'} n? \ ui v iijj_, i ^cr5 i Jii group are commonly much distorted (after Hall;. pifTipv si dp • T e V O 1 V i 11 2" striae, cancellated by concentric strite of similar strength. Found ill the Encrinal limestone, at Section 5 (very rare). Fleurotomaria lucina, var. perfasciata, Hall, is dis- tinguished by its coarser fasciculate stride on the body-whorl, which give the shell a nodose appearance. Found in the middle Pleurodictyum bed, in Avery's Ravine (one specimen). Pleckotomaria itvs. Hall. (Fig. 208.) (Pal. X. Y., Yol. v., Pt. n.,p. 76, PL XX.) ,j^ Distinguisldnu, Cliaracters. — Turbi- nate form, with ascending spire, higher than wide; four or five volutions, grad- ually expanding to the ventricose body- whorl; broadly oval aperture, some- what higher than wide; strong revolv- iJ/fafter HanT'°'""''''* ing stricV, crossed and cancelhited by i I. 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 Buffalo Society of Natu
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