156 



GASTEROPODA. 



equilateralis, Hall, 1860, Supp. to vol. 1, 



pt. 2, Iowa Rep., Keokuk Gr. [Sig. 



equal-sided.] 

 erectum, Hall, 1843, (Acroculia erecta) 



Geo. 4th Dist. N. Y., Cornif. & Ham. 



Gr. [Sig. erect, straight.] 

 expansus, see Strophostylus expansus. 

 fissurella. Hall, 1860, Supp. to Geo. Rep. 



Iowa, Yol. 1, pt. 2, Keokuk Gr. [Sig. 



a little cleft.] 

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



Up. Held. Gr. [Sig. arched.] 

 fornicatum rar. contractum. Hall, 1876, 



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



[Sig. contracted.] 

 gebhardi, Conrad, 1840, Ann. Rep. N. Y., 



Low. Held, and Oriskany Gr. [Ety. 



proper name.] 

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



Low. Held. Gr. [Sig. gibbous.] 

 haliotoides. Meek & Worthen, 1866, Proc. 



Acad. Nat. Sri. Phil., Kinderhook Gr. 



[Sig. like the Ilaliotus or ear-shell.] 

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



Held. Gr. [Sig. having gutters.] 

 infundibulum. Meek & Worthen, 1866, 



Proc. Acad. Nat. Sci. Phil., Keokuk 



Gr. [Sig. a funnel.] 

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



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



in size.] 

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



3, Low. Held. Gr. [Sig. with many 



plates.] 

 lodiense. Meek, 1871, Proc. Acad, ^"at. 



Sci. Phil., Waverly Gr. [Ety. proper 



name.] 

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



3, Oriskany sandstone. [Sig. mag- 

 nificent.] 

 multisinuatum, Hall, 1859, Pal. N. Y., 



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



many depressions.] 

 multispmosum. Meek, 1871, Pn c. Acad. 



Nat. Sci. Phi!., Cornif. Gr. [Sig. hav- 

 ing many spines.] 

 nebrascense. Meek, 1872, Pal. E. Neb., 



Coal Meas. [Ety. proper name.] 

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



Low. Held. Gr. [Ety. proper name.] 

 niagarense. Hall, 1852, (Acroculia niag- 



arensis) Pal. N. Y., vol. 2, Niagara Gr. 



[Ety. proper name.] 

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



Oriskany sandstone. [Sig. knobbed.] 

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



Low. Held. Gr. [Sig. plump in form.] 

 ovale, Stevens, 1858, (Acroculia ovalis) 



Am. Jour. Sci., vol. 25, Carboniferous. 



[Sig. oval.] 

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



Oriskany sandstone. [Sig. spread out.] 

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



3, Low. Held. Gr. [Sig. five-lobed.] 

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



Low. Held. Gr. [Sig. very wide.] 

 perplexum, Hall, 1876, Illust. Devonian 



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



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

 3, Low. Held. Gr. [Sig. very much 

 plicated.] 



pileiforme. Hall, 18.59, Pal. N. Y., vol. 3, 

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



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

 Low. Held. Gr. [Sig. broad-mouthed.] 



platystoma uar. alveatum. Hall, 1859, 

 Pal. N. Y., vol. 3, Low. Held. Gr. [Sig. 

 channeled.] 



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

 Low. Held. Gr. [Sig. in small folds.] 



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

 Low. Held. Gr. [Sig. folded.] 



priniievum, Billings, 1871, Can. Nat. & 

 Geol., vol. 6, Quebec Gr. [Sig. first- 

 born.] 



primordiale, Hull, 1863, 16th Reg. Rep., 

 Potsdam Gr. [Sig. the first of all.] 



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

 3, Low. Held. Gr. [Sig. pyramid- 

 formed.] 



quincyense, McChesney, 1861, New Pal. 

 Foss., Burlington Gr. [Ety. proper 

 name.] 



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

 (_)riskany sandstone. [Sig. turned 

 back.] 



retrorsum. Hall, 1S59, Pal. X. Y., vol. 3, 

 Low. Held. Gr. [Sig. turned back- 

 ward.] 



retrorsum !■«/■. abnorme. Hall, 1859, Pal. 

 N. Y., vol. 3, Low. Held. Gr. [Sig. 

 out of the usual order or form.] 



reversum. Hall, 1860, Supp. to Geo. Rep. 

 Iowa, vol. 1, pt. 2, Burlington Gr. 

 [Sig. turned or bent back.] 



rictum, Hall, 18(>2, 15th Reg. Rep., Ham. 

 & Up. Held. Gr. [Sig. open-mouthed.] 



robustum, Hall, bssg, Pal. N. Y., vol. 3, 

 Low. Held. Gr. [Sig. robust.] 



senex, "Winchell <& Marcy, 1865, (Porcel- 

 lia senex) Mem. Best. Soc. Nat. Hist., 

 Niagara Gr. [Sig. old, wrinkled.] 



sinuatum. Hall, 1859, Pal. X. Y., vol. 3, 

 Low. Held. Gr. [Sig. marked with 

 depressions.] 



spinigerum, AVorthen, 1873, Geo. Sur. 

 111., vol. 5, Coal Meas. [Sig. spine- 

 bearing.] 



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

 Held. Gr. [Sig. spiral.] 



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

 3, Oriskany sandstone. [Sig. some- 

 what knotty, or marked with short 

 projections.] 



subplicatum, Meek & Worthen, 1866, 

 Proc. Acad. Nat. Sci. Phil., Kinder- 

 hook Gr. [Sig. somewhat folded.] 



subrectum. Hall, 1859, 12th Reg. Rep. X. 

 Y., Up. Held. Gr. [Sig. somewhat 

 straight.] 



gubredum, Hall, 1860, Supp. to Iowa Rep. 

 The name being preoccupied, Meek & 

 Worthen propo.sed P. infundibulum. 



subundatum, Conrad, 1841, Ann. Rep. 

 N. Y., Up. Held. Gr. [Sig. somewhat 

 waved.] 



