GASTEROPODA. 



157 



subundatum, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, Low. Held. Gr. The 



name was preoccupied, 

 sulcatum, Conrad, 1841, Ann. Rep. N. Y., 



Oriskany sandstone. [Sijj:. furrowed.] 

 sulcoplicatum, Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr. [Sig. thrown up in 



plications.] 

 symmetricum, Hall, 1862, 15th Reg. Rep., 



Ham. & Up. Held. Gr. [Sig. sym- 



tenuiliratum. Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr. [Sig. fine-lined.] 

 thetis. Hall, 1862, 15th Reg. Rep., Ham. 



Gr. [Ety. mythological name.] 

 thetis var. subspinosum, Hall, 1876, Illust. 



Devonian Foss., Ham. Gr. [Sig. 



somewhat spiny.] 

 tortum. Meek, 1871, Proc. Acad. Nat. Sci., 



Coal Meas. [Sig. twisted.] 

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



Oriskany sandstone. [Sig. very much 



twisted.] 

 trigonale, Stevens, 1858, (Acroculia tri- 



gonalis) Am. Jour. Sci. & Arts, vol. 



25, Carboniferous. [Sig. triangular.] 

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



Low. Held. Gr. [Sig. three-lobed.] 

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



Low. Held. Gr. [Sig. trumpet-shaped.] 

 uncum. Meek & Worthen, 1866, Proc. 



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



crooked, hooked.] 

 undatum. Hall, 1876, Illust. Devonian 



Foss., Up. Held. Gr. [Sig. wavy.] 

 undulostriatum. Hall, 1859, Pal. N. Y., 



vol. 3, Low. Held. Gr. [Sig. having 



waved striae.], 

 unguiforme, Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr. [Sig. claw-shaped.] 

 uniseriale, Nicholson, 1874, Rep. Pal.Ont., 



Devonian. [Sig. having a single row 



or series.] 

 unisulcatum. Hall, 1859, Pal. N. Y., vol. 



3, Low. Held. Gr, [Sig. one-furrowed.] 

 ventricosum, Conrad, 1840, Ann. Rep. N. 



Y., Low. Held. Gr. [Sig. bulging out.] 

 vomerium, Winchell, 1863, Proc. Acad. 



Nat. Sci,, Chemung Gr. [Sig. a plow 



share.] 

 Platystoma, Conrad, 1842, Jour. Acad. Nat. 



Sci,, vol. 8. [Ety. platys, broad ; 



stoma, mouth.] 

 affine, Billings, 1874, Pal. Foss., vol. 2, 



Devonian. [Sig. related to.] 

 aplata, Hall, 1876, Illust, Devonian Foss,, 



Schoharie grit. [Sig. without lines,] 

 arenosum, Conrad, 1842, Jour. Acad. Nat 



Sci., vol. 8, Low. Held. Gr. [Sig. 



sandy.] 

 defiguratum, Hall, 1876, Illust. Devonian 



Foss,, Ham. Gr. [Sig. disfigured,] 

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



Low. Held, Gr. [Sig. depressed.] 

 euomphaloides. Hall, 1876, Illust. Devo- 

 nian Foss., Ham, Gr. [Sig. like a 



shell of the genus Enomphalus.'] 



hemisphericum, Hall, 1843, (Euomphalus 



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



Y., Niagara Gr. [Sig. hemispherical.] 

 UchaSy see Isonema lichas. 

 lineatum, Conrad, 1842, Jour. Acad, Nat. 



Sci., vol. 8, Cornif. Gr. [Sig. lined,] 

 lineatum, Hall, 1862, 15th Reg. Rep. The 



name was preoccupied, 

 lineatum var. amplum. Hall, 1876, Illust. 



Devonian Foss., Ham. Gr. [Sig. full, 



large.] 

 lineatum var. callosum, Hall, 1876, Illust. 



Devonian Foss., Ham. Gr. [Sig. thick, 



hard.] 

 lineatum var. 8inuosum,Hall, 1876, Illust. 



Devonian Foss., Ham. Gr. [Sig. wavy, 



sinuous.] 

 nana, see Naticopsis nana, 

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



Niagara Gr. [Ety, proper name.] 

 peoriense, McChesney, 1860, Desc. New 



Pal, Foss,, Up, Coal Meas. [Ety. 



proper name.] 

 plebeium. Hall, 1876, 28th Reg. Rep. N. 



Y., Niagara Gr. [Sig, common.] 

 pleurotoma, Hall, 1876, Illust. Devonian 



Foss,, Up. Held. Gr, [Sig. from the 



genus Fleurotoma.'] 

 strophium, Hall, 1862, 15th Reg. Rep., 



Cornif, Gr. [Sig. twisted or turned.] 

 subangulatum, Hall, 1859, Pal. N. Y,, vol. 



3, Low. Held. Gr. [Sig, somewhat 



angular.] 

 trigonostoma, Meek, 1871, Proc. Acad. 



Nat. Sci,, Niagara Gr. [Sig. triangu- 

 lar-mouthed,] 

 tamida, see Pleurotomaria tumida. 

 turbinatum. Hall, 1861, 14th Reg. Rep., 



Up. Held. Gr. [Sig. cone-shaped.] 

 turbinatum car. cochleatum, Hall, 1876, 



Illust. Devonian Foss., Up. Held. Gr. 



[Sig. spiral-formed.] 

 unisulcatum, Conrad, 1842, (Pleurotomaria 



unisulcata) Jour. Acad. Nat. Sci., vol. 



8, Up. Held Gr. [Sig. having one 



depression.] 

 ventricosum, Conrad, 1842, Jour. Acad. 



Nat. Sci., vol. 8, Low. Held. Gr. [Sig. 



ventricose.] 

 Platyschisma, McCoy, 1844, Syn.Carb. Foss., 



Ireland. [Ety. plaiys, wide ; schisma, 



a slit,] 

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

 boniferous. [Sig. doubtful,] 

 helicoides, (?) Sowerby, 1829, (Ampularia 



helicoides) Min, Conch., vol. 8, Coal 



Meas. [Sig. resembling a shell of the 



genus Helix.'} 

 Plectostylus, Conrad, 1842, Syn. for Macro- 



cheilus. 

 hildrethi, see Macrocheilus hildrethi. 

 Pleurotomaria, Defrance, 1826, Diet. Sci. 



Nat,, 41. [Ety. Pleura, side ; tome, cut 



or notch.] 

 abrupta, Billings, 1859, Can. Nat. & G^o., 



vol. 4, Calciferous Gr. [Sig. terminat- 

 ing suddenly.] ,  



