LAMELLIBRANCHIATA. 



185 



oblongus, Meek & Worthen, 1860, (Avic- 

 ula oblonga) Proc. Acad. Nat. Sci. 

 Phil., Keokuk Gr. [Sig. oblong.] 



occidentalis, Shumard, 1855, (Pecten oc- 

 cidentalis) Geo. Rep. Mo., Carbonifer- 

 ous & Permian. [Sig. western.] 



occidentalis, "Winch ell, 1863, Proc. Acad. 

 Nat. Sci., Chemung Gr. This name 

 was preoccupied. 



orbicidatus, see Lyriopecten orbiculatus. 



oweni. Meek & Worthen, 1860, Proc. 

 Acad. Nat. Sci. Phil., Keokuk Gr. 

 [Ety. proper name.] 



parjlis, Conrad, 1842, (Avioula parilis) 

 Jour. Acad. Nat. Sci. Phil., vol. 8, 

 Cornif. Gr. [Sig. equal, hke.] 



pecteniformis, Conrad, 1842, (Avicula 

 pecteniformis) Jour. Acad. Nat. Sci . 

 vol. 8, Up. Held. Gr. and Marcellus 

 shale. [Sig. like a Pecten.] 



pellucidus. Meek & Worthen, 1860, Proc. 

 Acad. Nat. Sci. Phil., Coal Meas. [Sig. 

 clear, transparent.] 

 princeps, Conrad, Ham. Gr. [Sig. prin- 

 cipal.] 

 providencensis. Cox, 1857, (Pecten pro- 

 videncensis) Geo. Sur. Ky., vol. 3, 

 Coal Meas. [Ety. proper name.] 

 rectilaterarius. Cox, 1857, (A.vicula rec- 

 talaterarea) Geo. Sur. Ky., vol. 3, 

 Coal Meas. [Sig. straight-sided.] 

 reticulatus, Dawson, 1868, Acad. Geol., 



Carboniferous. [Sig. reticulated.] 

 ringens. Swallow, 1858, (Pecten ringens) 

 Trans. St. Louis Acad. Sci., Permian 

 Gr. [Sig. gaping.] 

 rugaestriatus, Hall, 1843, (Lima rugse- 

 striata) Geo. Pep. 4th Dist. N. Y., 

 Chemung Gr. [Sig. having wrinkled 

 striae.] 

 sanduskyensis, syn. for Aviculopecten par- 

 ilis. 

 signatus. Hall, 1843, (Avicula signata) 

 Geo. Rep. 4th Dist. N. Y., Chemung 

 Gr. [Sig. marked.] 

 simplex, Dawson, 1868, Acad. Geol., Car- 

 boniferous. [Sig. simple.] 

 striatus. Hall, 1843, (Pecten striatus) Geo. 

 Rep. 4th Dist. N. Y., Chemung Gr. 

 [Sig. striated.] 

 suborbicularis. Hall, 1843, (Pterinea sub- 

 orbicularis) Geo. Rep. 4th Dist. N. Y., 

 Chemung Gr. [Sig. somewhat orbic- 

 ular.] 

 subrectus, Conrad,1841,( Avicula subrecta) 

 Ann. Rep. N. Y., Coralline limestone. 

 [Sig. somewhat-straight.] 

 tenuicostus, Winchell, 1863, Proc. Acad. 

 Nat. Sci., Chemung Gr. [Sig. slender- 

 ribbed.] 

 undulatus. Hall, 1877, Pal. N. Y., vol. 5, 



Ham. Gr. [Sig. wavy.] 

 unionensis, Worthen, 1875, Geo. Sur. 111., 

 vol. 6, Oorniferous Gr. [Ety. proper 

 name.] 



2i 



utahensis. Meek, 1860, (Pecten utahensis) 



Proc. Acad. Nat. Sci., Coal Meas. 



[Ety. proper name.] 

 whitei. Meek, 1872, Pal. E. Neb., Coal 



Meas. [Ety. proper name.] J 

 williamsi. Meek, 1871, Proc. Acad. Nat. 



Sci., Chouteau limestone. [Ety. 



proper name.] 

 winchelli. Meek, 1875, Ohio Pal., vol. 2, 



Waverly Gr. [Ety. proper name.] 

 AvicuLOPiNNA, Meek, 1867, Am. Jour. Sci., 



vol. 44. [Ety. from the resemblance 



to the genera Amcula and I'inna.'} 

 americana. Meek, 1867, Am. Jour. Sci., 



vol. 44, Coal Meas. [Ety. proper 



name.] 



AxiNus, Sowerby, 1821, Min. Conch., vol. 3. 



[Ety. axine, battle-axe.] This genua 



is unknown in palseozoic rocks. 



ovatiis, see Schizodus ovatus. 



securis, Shumard, 1859, Trans. St. Louis 



Acad. Sci., Permian Gr. [Sig. axe or 



hatchet-shaped.] 

 Bakbvellia, King, 1849, Perm. Fobs. [Ety. 



proper name.] 

 antiqua, Munster, 1826, (Avicula antiqua) 



Goldtuss Germ. Pefref. Not American, 

 parva. Meek & Hay den, 1858, Trans. Alb. 



Inst., vol. 4, Permian Gr. [Sig. small.] 

 (?) pulchra. Swallow, 1858, Trans. St. 



Louis Acad. Sci., Permian Gr. [Sig. 



beautiful.] 

 Cakbonarca, Meek & Worthen, 1870, Proc. 



Acad. Nat. Sci. Phil. [Ety. carbo, 



coal; Area, a genus of shells; from 



the minute teeth on the cardinal mar- 

 gin, as in Area.} 

 gibbosa. Meek & Worthen, 1870, Proc. 



Acad. Nat. Sci. Phil., Coal Meas. [Sig. 



gibbous.] 

 Cabdinia, Agassiz, 1838, in Societ. Basil. 



[Ety. cardo, the hinge of a door.] 

 sequimarginalis, Winchell, 1862, Proc. 



Acad. Nat. Sci., Marshall Gr. [Sig. 



equal-margined.] 

 antigonesensis, Dawson, 1868, Acad.Geo., 



Carb. [Ety. proper name.] 

 complanata, Winchell, 1862, Proc. Acad. 



Nat. Sci., Portage Gr. [Sig. smoothed.] 

 concentrica, Winchell, 1862, Proc. Acad. 



Nat. Sci., Marshall Gr. [Sig. con- 

 centric] 

 cordata. Swallow, 1858, Trans. St. Louis 



Acad. Sci., Permian Gr. [Sig. heart- 

 like.] 

 (?) fragilis. Cox, 1857, Geo. Sur. Ky., vol. 



3, Coal Meas. [Sig. frail, easily 



broken.] 

 occidentalis. Swallow, 1860, Trans. St. 



Louis Acad. Sci., Chemung Gr. [Sig. 



western.] 

 subangulata. Swallow, 1858, Trans. St. 



Louis Acad. Sci., Permian Gr. [Sig. 



somewhat angular.] 

 subangulata, Dawson, 1868, Acad. Geol 

 This name was preoccupied. 



