CLASS CEPHALOPODA. 



FAMILY ASCOCERATID.E — Ascoceras, Conoceras, Glossoceras. 



FAMILY CERIOLIDjE.— Beatrkea. 



FAMILY CYRTOCERATID.E.— Cyrtoceras, Cyrtocerina, Oncoceras. 



FAMILY GOMPHOCER A.TID,E.-^Gomphoceras. 



FAMILY GONIATITID,E.— Goniatites. 



FAMILY GYROCERATID.E.— Gyroceras. 



FAMILY NAUTILID.E.— Discites, Lituites, (?) Nautilus, Pteronautilus, Solenocheilus, 



Temnocheilus, Trematodiscus, Trocholites. (?) 

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



Endoceras, Gonioceras, Huronia, Orruoceras, Orthoceras, Piloceras. 

 FAMILY PHRAGMOCERATID.E.— Phragmoceras, Streptoceras. 

 FAMILY TROCHOCERATID.E.— Trochoceras. 

 INCERTJE SEDIS.— Discosorus, Seerichnites. 



Actinoceras, Bronn, 1837, Lethaea Geognos- 



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

 bigsbyi, Stokes, 1840, Trans. Geo. Soe., 



2nd series, vol. 5, 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; 



keras, 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 



supposedly Hyatt, (Am. Jour. Sci. & 



Arts, 1865)* to belong to the class 



Cephalopoda, and he proposed a new 



order for the genus, to wit: Cerioliles, 



from kerkm, a honey comb; lithos, a 



stone, and a new family Ceriolidx. 

 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. 

 Comities, Schlotheim, 1820, Petrefactenkunde, 

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

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

 Tenn. Not satisfactorily denned. 

 Conoceras, Bronn, 1835, Leth. Geogn. 

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

 angulosum, Bronn, 1834, Leth. Geogn., 

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

 Conotubvlaria, Troost, syn. for Orthoceras. 

 brongniarli, see Orthoceras brongniarti. 

 cuvieri, see Orthoceras cuvieri. 

 defrancii, see Orthoceras defrancii. 

 goldfussi, see Orthoceras goldfussi. 

 Convlites, Cozzens, 1848. Not satisfactorily 

 defined. 

 angulosum, Cozzens, 1848. Not satisfac- 

 torily defined. It may be a plant. 



