. Bulletin - New York State Museum. Science. 190 NEW YORK STATE MUSEUM Anastrophia interplicata (Hall) (Fig. loi). Atrypa inter- plica t a Hall (1852. Pal N. Y. 2:275, pi. 57) Distinguishing characters. Extremely con- vex; brachial valve the deepest; moderate sinus and fold; from two to three plications in the former and three to four on the latter; lateral plications increase by implantation. Fig. 101 Anastrophia Inter- ,.,„,. , . , piicata Found in the Clinton lenses^ and m the lower and middle Rochester shale at Niagara. Also in the shale at Lockport (Hall). ...=%.^ Anastrophia brevirostris
. Bulletin - New York State Museum. Science. 190 NEW YORK STATE MUSEUM Anastrophia interplicata (Hall) (Fig. loi). Atrypa inter- plica t a Hall (1852. Pal N. Y. 2:275, pi. 57) Distinguishing characters. Extremely con- vex; brachial valve the deepest; moderate sinus and fold; from two to three plications in the former and three to four on the latter; lateral plications increase by implantation. Fig. 101 Anastrophia Inter- ,.,„,. , . , piicata Found in the Clinton lenses^ and m the lower and middle Rochester shale at Niagara. Also in the shale at Lockport (Hall). ...=%.^ Anastrophia brevirostris Hall (Fig. 102) Atrypa brevirostris _,«!>" Hall (1852. Pal N. Y. 2:278, pi. 58) Distinguishing characters. Wider than high; strongly convex; brachial valve deepest; short nearly equal beaks; 1 i-r ,• •, * Fig. 102 Anastrophia brevirostris sharp bifurcating or interpolated plica- tions, from five to six in the sinus and fold, which are broad and ill defined. Found in the lower Rochester shale at Niagara (?). Also in the shale at Lockport (Hall). Genus pentamerus Sowerby [Ety.: Tziyre, five; ;^, part] (1813. Sowerby. Mineral conchology, i:/'6;ll3ill &l Clavkt. 1893. Pal N. Y. V. 8, pt 2, p. 236) Shell strongly inequivalve, biconvex with highly arched pedicle valve; surface smooth, or with a few broad and obscure radiating undulations. Under the beak of the pedicle valve is a deep and narrow spondyliuni, or plate with an excavated spoon-shaped cavity, supported by a high vertical septum of variable length; brachial valve with a pair of septa, the interior of the shell being thus di- vided into five compartments. Pentamerus oblongus Sowerby (Fig. 103) (Hall. 1852. Pal N. Y. 2:79, Pl- 25) Distinguishing characters. Very large and oblong, varying in out- line with age; wider in anterior part; valves strongly convex at beaks; beak of pedicle valve overarching; subtrilobate division of. Please note that these images are extracted from scanned page imag
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