LAMELLIBEANCHIATA. 



185 



proper name.] 

 1857, ( Avicula rec- 

 Sur. Ky., vol. 3, 

 straight-sided,] 

 1868, Acad. Geol., 



oblongus, Meeli & Worthen, 1860, (Avic- 

 ula oblonga) Proc. Acad. Nat. Sci. 

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



occidentalis, Shumard, 1855, (Pecten oc- 

 cidentalis) Geo. Hep. 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.] 



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 Bleas. [Sig. 

 clear, transparent.] 



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

 cipal.] 



providencensis. Cox, 1857, (Pecten pro- 

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

 Coal Meas. [Ety, 



rectilaterarius. Cox, 

 tttlaterarea) Geo. 

 Coal Meas. [Sig. 



reticulatus, Dawson, 



Carboniferous. [Sig. reticulated.] 



ringens. Swallow, 1858, (Pecten ringens) 

 Trans. St. Louis Acad. Sci., Permian 

 Gr. [Sig. gaping.] 



rugsestriatus. Hall, 1843, (Lima rugse- 

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

 Chemung Gr. [Sig. having wrinkled 

 striae.] 



sanduskyensis, syn. for Aviculopecten par- 

 ilis. 



signatns. 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., ChernjjngGr. [Sig. slender- 

 ribbed.] ~c-~i 

 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.] 



24 



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 Auiaila and Pimna.'] 

 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 palseozoic rocks. 

 ovatus, see Schizodus ovatus. 

 securis, Shumard, 1859, Trans. St. Louis 



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



hatchet-shaped.] 

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



proper name.] 

 antiqua, Munster, 1826, (Avicula antiqua) 



Goldf uss Germ. Petref . Not American, 

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



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

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



Louis Acad. Sci., i?ermian Gr. [Sig. 



beautiful.] 

 Caebonarca, 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 Arca.'\ ■ 

 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., 



Garb. [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.] 

 /J, occidentalis, Swallow, 1860, Trans. St. 



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



western.] /l^-V,'. 



subangulata. Swallow, 1858, Trans. St. 



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

 somewhat angular.] 

 subangulata, Dawson, 1868, Acad. Geol 

 This name was preoccupied. 



