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, Wincbell, 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.] 



parilis, Conrad, 1842, (Avicula parilis) 

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

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



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, (Avicula 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.] 



rugfestriatus, Hall, 1843, (Lima rugse- 

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

 Chemung Gr. [Sig. having wrinkled 

 strise.] 



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, Corniferous Gr. [Ety. proper 

 name.] 



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.] 

 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 Avicula and Pinna.'] 

 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 genus 

 is unknown in palaeozoic rocks. 

 ovatus, see Schizodus ovatus. 

 securis, Shumard, 1859, Trans. St. Louia 

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

 hatchet-shaped.] 

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

 proper name.] 

 antiqua, Munster, 1826, (Avicula antiqua) 

 GoldfussGerm.Petref. Not American, 

 parva, Meek & Hayden, 1858, Trans. Alb. 

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

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

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

 beautiful.] 

 Cabbonarca, 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.] 

 Cardinia, 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.] 

 subangidata, Dawson, 1868, Acad. Geol 

 This name was preoccupied. 



