CLASS GASTEEOPODA. 



FAMILY BELLEROPHONTID^.— Bellerophon, Bucania, Carinaropsis, Cyrtolites, 



Ecculiomphalus, Microceras, Phragmostoma, Porcellia, Tremanotus. 

 FAMILY CALYPTR^IIDiE. — Capulua,Conchopeltis,Metoptoma, Pal8eacm£ea,Platyceras, 



Trochita. 

 FAMILY CHITONIDiE.— Chiton. 

 FAMILY DENTALIIDiE.— Dentalium. 



FAMILY HELIOIDiE.— Dawsonella, Pupa, Streptaxis, Zonites. 

 FAMILY LITTORINIDyE.— Xenophqra. 

 FAMILY MACLUR^IDiE.— Maclurea. 

 FAMILY MURICID^.— Fusispira. i 



FAMILY NATICID7E.— Naticopsis, Trachj^domia. 

 FAMILY PLEUROTOMARIIDiE.— Helicotoma, Microdoma, Murchisonia, Pleuroto- 



maria, Raphistoma, Scalites. 

 FAMILY PYRAMIDELLIDiE.— Aclis, Chemiiitzia, Loxonema, Macrocheilus, Polyphe- 



mopsis, Soleniscus, Subulites. 

 FAMILY ROTELLIDiE. -Anomphalus. 

 FAMILY SCALARIID^.— liolopella. 

 FAMILY SOLaRIDjE. — Euomplialus, OpMleta, Phanerotinus, Platyschisma, Platyos- 



toma, Straparollus, StraparoUina, Strophostylus. 

 FAMILY TURBINIDjE. — Clisospira, Cyclonema, Cyclora, Eunema, Holopea, Isonema, 



Orthonema, Orthostoma, Trochonema, Turbo. 

 FAMILY TURRITELLID^.— Turritella. 



Aclis, Loven. [Ety. a, without; Jcleis, a 



projection.] 

 minuta, Stevens, 1858, Am. Jour. Sci., 



vol. 25, Coal Meas. [Sig. minute.] 

 robusta, Stev<!ns, 1858, Am. Jour. Sci., 



vol. 25, Coal Meas. [Sig. robust.] 

 swallovana, Geinitz, 18U6, (Turbonella 



swallovana) Carb. und Dyas in Neb., 



Coal Meas. [Ety. proper name.] 

 AcroniXia, Phillips, 1841, syn. for Platyoeras. 

 angulata, see Platyceras angulata. 

 erecla, see Platyceras erecta. 

 ovalii, see Platyceras ovalis. 

 niagarensis, see Platyceras niagarensis. 

 trigonalis, see Platyceras trigonalis. 

 Ampullaria, Lamarck, 1801, Sygt. An. sans 



Vert. [Ety. ampulla, a flaslc] 



helicoidea, see Platyschisma helicoides. 



Anomphalus, Meek & Worthen, 1866, Proc. 



Acad. Nat. Sci. [Ety. Anomphalos, 



without an umbilicus.] 

 meeki, seeDawsonella meeki. 

 rotulus. Meek & Worthen, 1866, Proc. 



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



a litttle wheel.] 



Belleropi-ion, Montfort, 1808, Conch. Syst., 



vol. 1. [Etv. mythological name.] 

 acutilira, liali; 1862, 15th Reg. Rep., 



Ham. Gr. [Sig. sharp-ridged.] 

 acutus, Sowerby, 1839, Murch. Sil. Syst., 



Low. Silurian. [Sig. sharp.] 

 allegoricus, "White, 18 74, Rep. Invert. 



Foss., Quebec Gr. [Sig. allegorical.] 

 angustata, see Bucania angustata. 

 apertus, Sowerby, 1825, Min. Conch., vol. 



5, Low. Carb. [Sig. an opening.] 

 argo, Billings, 1860, Can. Nat. & Geol., 



vol. 5, Black Riv. & Trenton Gr. 



[Ety. mythological name.] 

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



Coralline limestone. [Sig. having ear- 

 like appendages.] 

 barquensis, Wirfchell, 1862, Proc. Acad. 



Nat. Sci., Marshall Gr. [Ety. proper 



name.] 

 bidormtm, see Bucania bidorsata. 

 bilobatus, Sowerby, 1839, Murch. Sil. 



Syst., Black Riv. to Mid. Sil. [Sig. 



two-lobed.] 



