CLASS CEPHALOPODA. 



FAMILY ASCOCERATID^E.— Ascoceras, Conoceraa, Glossoceras. 



FAMILY CERIOLID^.— Beatricea. 



FAMILY CYRTOCERATID^.— Cyrtoceras, Cyrtocerina, Oncoceras. 



FAMILY GOMPHOCER A.TID^.— Gomphoceraa. 



FAMILY GONIATITID^.— Goniatites. 



FAMILY GYROCERATID^.— Gyroceras. 



FAMILY NAUTILID^ — Diacites, Lituites, (?) Nautilus, Pteronautilus, Solenocheilus, 



Temnocheilus, Trematodiscus, Trocholites. (?) ' 



FAMILY ORTHOCERATID^.— Actinoceras, Cameroceras, Colpoceras, Diploceras, 



Endoceras, Gonioceras, Huronia, Ormoceras, Orthoceras, Piloceras. 

 FAMILY PHRAGMOCERATID^.— Phragmoceras, Streptocera^. 

 FAMILY TROCHOCERATIDiE.— Trochoceras. 

 INCERT^ SEDIS.— Discosorus, Seerichnites. 



AcTiNOCERAS, Bronii, 1837, Lethaea Geognos- 



tica. [Ety. aktin, sl ray ; keras, a horn.] 

 bigsbyi, Stokes, 1840, Trans. Geo. Soc, 



2nd series, vol. o, Chazy Gr. [Ety. 



proper name.] 

 inops, Dawson, 1868, Acad. Geol., Carb. 



[Ety. meagre.] 

 lyoni, Stokes, 1840, Trans. Geol. Soc, vol. 



5, Black Riv. Gr. [Ety. proper name.] 

 richardsoni, Stokes, 1840, Trans. Geol. 



Soc, 2nd series, vol. 5, Silurian. [Ety. 



proper name.] 

 ' simmsi, Stokes, 1840, Trans. Geo. Soc, 



2nd series, vol. 5, Sil. [Ety. proper 



name.] 

 AscocERAS, Barrande, 1848, Haidinger's Ber- 



ichte. [Ety. askos, a leather bottle; 



kera^, horn.] 

 anticostiense, Billings, 1866, Catal. Sil. 



Foss. Antic, Anticosti Gr. [Ety. 



proper name.] 

 canadense, Billings, 1857, Rep. of Progr., 



Hud. Riv. Gr. [Ety. proper name.] 

 newberryi, Billings, 1862, Pal. Foss., vol. 



1, Hud. Riv. & Anticosti Gr. [Ety. 



proper name.] 

 Beatricea, Billings, 1857, Rep. of Progr. 



[Ety. proper name.] This genus is 



supposed, by Hyatt, (Am. Jour. Sci. & 



Arts, 1865) to belong to the class 



Cephalopoda, and he proposed a new 



order for the genus, to wit: CeriolUes, 



from kerion, a honey comb; lithos, a 



stone, and a new family Ceriolidfs. 

 nodulosa, Billings, 1857, Rep. of Progr., 



Hud. Riv. & Mid. Sil. [Sig. having 



small knots.] 



undulata, Billings, 1857, Rep. of Progr., 

 Mid. Sil. [Sig. wavy.] 

 Cameroceras, Conrad, 1842, Jour. Acad. Nat. 

 Sci. Phil., vol. 8. [Ety. kamara, a 

 chamber; keras, horn.] 

 trentonense, Conrad, 1842, Jour. Acad. 

 Nat. Sci. Phil., vol. 8. Trenton Gr. 

 [Ety. proper name.] 

 Colpoceras, Hall, 1850, 3rd Reg. Rep. N. Y. 

 [Ety. kolpos, a furrow; keras, horn.] 

 virgatum. Hall, 1850, 3rd Reg. Rep. 

 N. Y,, Birdseye and Black Riv. Gr. 

 [Sig. wand-like.] 

 Clymenia, Munster, 1832. [Ety. mythologi- 

 cal name.] 

 complanata, see Goniatites complanatus. 

 erato, see Goniatites erato. 

 ConilUes, Schlotheim, 1820, Petrefactenkunde, 

 etc [Ety. konos, a cone ; lithos, stone.] 

 capricornuhis, Troost, 1840, 5th Geo. Rep. 

 Tenn. Not satisfactorily defined. 

 Conoceras, Bronn, 18 35, Leth. Geogn. 

 [Ety. konos, a cone ; keras, horn.] 

 angulosum, Bronn, 1834, Leth. Geogn., 

 Black Riv. Gr. [Sig. full of corners.] 

 Omotubularia, Troost, syn. for Orthoceras. 

 brongniarti, see Orthoceras brongniarti. 

 cuvieri, see Orthoceras cuvieri. 

 de/rancii, see Orthoceras defrancii. 

 goldfussi, see Orthoceras goldfussi. 

 Conidites, Cozzens, 1848. Not satisfactorily 

 defined. 

 angulosum, Cozzens, 1848. Not satisfac- 

 torily defined. It may be a plant. 



