CLASS GASTEEOPODA. 



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



Ecculiomphalus, Microceras, Phragmostoma, Porcellia, Tremanotus. 

 FAMILY CALYPTRiEIDiE.— Capulus,Coiichopeltis,Metoptoma, Pal8eacm8ea,Platycera8, 



Trochita. 

 FAMILY CHITONID^.— Chiton. 

 FAMILY DENTALIID^.— Dentalium. 



FAMILY HELICID^.— Dawsonella, Pupa, Streptaxis, Zonites. 

 FAMILY LITTORINIDyE.— Xenophora. 

 FAMILY MACLUR^ID^.— Maclurea. 

 FAMILY MURICID^.— Fusispira. 

 FAMILY NATICIDiE.— Naticopsis, Trachydomia. 

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



maria, Raphistoma, Scalites. 

 FAMILY PYRAMIDELLID^.— Aclis, Chemnitzia, Loxonema, Macrocheilus, Polyphe- 



mopsis, Solenisciis, Subulites. 

 FAMILY ROTELLID^.-Anomphalus. 

 FAMILY SCALARIIDiE.— Holopella. 

 FAMILY SOLaRID^.— P^uomphalus, Ophileta, Phanerotinus, Platyschisma, Platyos- 



toma, StraparoUus, Straparollina, Strophostylus. 

 FAMILY TURBINID^.— Clisospira, Cyclonema, Cyclora, Eunema, Holopea, Isonema, 



Orthonema, Orthostoma, Trochonema, Turbo. 

 FAMILY TURRITELLIDiE.— Turritella. 



AcLis, Loyen. [Ety. a, without; hleis, a 



projection.] 

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



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

 robusta, Stevens, 1858, Am. Jour. Sci., 



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

 swallovana, Geinitz, 18(56, (Turbonella 



swallovana) Carb. und Dyas in Neb., 



Coal Meas. [Ety. proper name.] 

 Acroctdia, Phillips, 1841, syn. for- Platyceras. 

 angulata, see Platyceras angulata. 

 ereda, see Platyceras erecta. 

 ovalis, see Platyceras ovalis. 

 niagarcnsis, see Platyceras niagarensis. 

 trigonalis, see Platyceras trigonalis. 

 Ampullaria, Lamarck, 1801, Syst. An. sans 



Vert. [Ety. ampulla, a flask.] 



helicoides, see Platyschisma helicoides. 



Anomphalus, Meek & Worthen, 1866, Proc. 



Acad. Nat. Sci. [Ety. Anomphalos, 



without an umbilicus.] 

 meekly see Dawsonella meeki. 

 rotulus. Meek & Worthen, 1866, Proc. 



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



a litttle wheel.] 



Bellerophon, Montfort, 1808, Conch. Syst., 



vol. 1. [Etv. mythological name.] 

 acutilira, Hall^ 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. 



Fobs., 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, Winchell, 1862, Proc. Acad. 



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



name.] 

 bidorsatus, see Bucania bidorsata. 

 bilobatus, Sowerby, 1839, Murch. Sil. 



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



two-lobed.] 



