184 



LAMELLIBRANCHIATA. 



tenuilamellata, Hall, 1859, Pal. N. Y., 



vol. 3, Low. Held. Gr. [Sig. very thin- 

 plated.] 

 textilis, Hall, 1859, Pal. N. Y., vol. 3, Low. 



Held. Gr. [Sig. woven.] 

 textilis var. arenaria. Hall, 1859, Pal. N. 



Y., vol. 3, Low. Held. Gr. [Sig. sandy.] 

 trentonensis, Conrad, 1842, Jour. Acad. 



Nat. Sci., vol. 8, Trenton Gr. [Ety. 



proper name.] 

 tricostata, Vanuxem, 1842, Geo. Rep. N. 



Y., Chemung Gr. [Sig. three-ribbed.] 

 trilobata, Conrad, 1842, Jour. Acad. Nat. 



Sci., vol. 8, Up. Sil. [Sig. three-lobed.] 

 triplistriata, Stevens, 1858, Am. Jour. 



Sci., vol. 25, Coal Meas. [Sig. three- 

 lined.] 

 triquetra, Hall, 1843, Geo. Rep. N. Y., 



Onondaga Gr. [Sig. a triangle or 



three-cornered figure.] 

 triradiata, Conrad, 1842, Geo. Rep. 3rd 



Dist. N. Y., Portage Gr. [Sig. three- 

 plicated.] 

 tuberculata, Conrad, 1838, Ann. Rep. N. 



Y., Corniferous Gr. [Sig. tubercu- 



lated.] 

 umbonata, Hall, 1859, Pal. N. Y., vol. 3, 



Low. Held. Gr. [Sig. protuberant.] 

 undata, Hall, 1852, Pal. N. Y., vol. 2, 



Niagara Gr. [Sig. wavy.] 

 welchi, James, 1874, Cin. Quar. Jour. Sci., 



vol. 1, Cin'ti Gr. [Ety. proper name.] 

 whitii, Winchell, 1863, Proc. Acad. Nat. 



Sci., Che'mung Gr. [Ety. proper 



name.] 

 AvicuLOPECTEN, McCoy, 1851, Ann. Mag. 



Nat. Hist., 2nd series, vol. 7. [Ety. 



Aviculopecten, from the resemblance to 



the shells of the genera Avicula and 



Pecten.l 

 acadicus, Hartt, 1868, Acad. Geol., Carb. 



[Ety. proper name.] 

 acutialatus. Swallow, 1858, (Avicula acu- 



tialata) Trans. St. Louis Acad. Sci., 



Permian Gr. [Sig. sharp- winged.] 

 fequilaterus, Hall, 1843, (Avicula sequila- 



tera) Geo. Rep. 4th Dist. N. Y., Up. 



Held. Gr. and Marcellus shale. [Sig. 



equal-sided.] 

 amplus. Meek & Worthen, 1860, Proc. 



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



[Sig. full, large.] 

 armigerus, Harlan, 1835, (Pecten armige- 



rus) Trans. Geo. Soc. Penn., Carb. 



[Sig. armed.] 

 aviculatus. Swallow, 1858, (Pecten avicu- 



latus) Trans. St. Louis Acad. Sci., Coal 



Meas. [Sig. spread out like an Avicula.'] 

 b\irlingtonensis, Meek & Worthen, 1860, 



Proc. Acad. Nat. Sci., Burlington Gr. 



[Ety. proper name.] 

 cancellatus, Hall, 1843, (Pecten cancel- 



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



Chemung Gr. [Sig. cancellated.] 

 cArboniferus, Stevens, 1858, (Pecten car- 



boniferus) Am. Jour. Sci. & Arts, Coal 



Meas. [Sig. from the coal formation.] 



caroli, Winchell, 1863, Proc. Acad. Nat. 



Sci., Chemung Gr. [Ety. proper 



name.] . 

 clevelandicus. Swallow, 1858, (Pecten 



clevelandicus) Trans. St. Louis Acad. 



Sci., Permian Gr. [Ety. proper name.] 

 coloradoensis, Newberry, 1861, Ives' Col. 



Ex. Exped., Coal Meas. [Ety. proper 



name.] 

 convexus. Hall, 1843, (Pecten convexus) 



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



Gr. [Sig. convex.] 

 cora, Dawson, 1868, Acad. Geol., Carb. 



[Ety. mythological name.] 

 coreyanus. White, 1874, Rep. Invert. 



Foss. [Ety. proper name.] 

 coxanus. Meek & Worthen, 1860, Proc. 



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



[Ety. proper name.] 

 crassicostatus, Hall, 1872, 24th R«g. Rep., 



Up. Held. Gr. [Sig. thick-ribbed.] 

 crenistriatus, Meek, 1871, Proc. Acad. 



Nat. Sci. Phil., Wayerly Gr. [Sig. 



having crenulated strise.] 

 debertanus, Dawson, 1868, Acad. Geol., 



Carboniferous. [Ety. proper name.] 

 dolabriformis. Hall, 1843, (Pecten (?) 



dolabriformis) Geo. Rep. 4th Dist. N. 



Y., Chemung Gr. [Sig. resembling 



a mattock or pick axe.] 

 duplicatus, Hall, 1843, (Pecten duplicatus) 



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



Gr. [Sig. doubled, folded in two.] 

 fragilis. Hall, 1843, (Avicula fragilis) 



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



slate. [Sig. frail, easily broken.] 

 glaber, see Pernopecten glaber. 

 gradicostus. White, 1862, Proc. Post. 



Soc. Nat. Hist., vol. 9, Chemung Gr. 



[Sig. ribbed in steps.] 

 halli, Swallow,1860, (Avicula halli) Trans. 



St. Louis Acad. Sci., Coal Meas. [Ety. 



proper name.] 

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



Coal Meas. [Ety. proper name,] 

 indianensis, Meek & Worthen, 1866, Proc. 



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



[Ety. proper name.] 

 intercostalis, Winchell, 1866, Rep. Low. 



Peninsula Mich., Ham. Gr. [Sig. 



lined between costae.] 

 interlineatus. Meek & Worthen, 1860, 



Proc. Acad. Nat. Sci. Phil., Low. Coal 



Meas. [Sig. interlined.] 

 koniucki, Meek & Worthen, 1860, Proc. 



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



[Ety. proper name.] 

 Umaformis, see Pernopecten limiformis. 

 lyelli, Dawson, 1868, Acad. Geol., Carb. 



[Ety. proper name.] 

 maccoyi, Meek & Hayden, 1865, Pal.,Up. 



Mo., Permian Gr. [Ety. proper name.] 

 missouriensis, Shumard, 1855, (Pecten 



missouriensis) Geo. Rep. Mo., St. Louis 



Gr. [Ety. proper name.] 

 neglectus, Geinitz, 18(j6, (Pecten neglec- 



tus) Carb. und Dyas in Neb., Coal 



Meas. [Sig. overlooked.] 



