CLASS CEPHALOPODA. 



FAMILY ASCOCEEATID^.— Ascoceras, Conoceras, Glossoceras. 



FAMILY CERIOLIDyE.— Beatricea. 



FAMILY CYETOOERATID^.— Cyrtoceras, Cyrtocerina, Oncoceras. 



FAMILY GOMPHOCERATIDiE.— Gomphoceras. 



FAMILY GONIATITIDiE.— Goniatites. 



FAMILY GYROCERATIDiE— Gyroceras. 



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



Temnocheilus, Trematodiscus, Trocholites. (?) 

 FAMILY ORTHOCERATIDjE.— Actinoceras, Cameroceras, Oolpoceras, Diploceras, 



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

 FAMILY PHRAGMOCERATID^.— Phragmoceras, Streptoceras. 

 FAMILY TROCHOCERATID^.— Trochoceras. 

 INOERTiE SEDIS.— Discosorus, Sferichnites. 



AcTiNOCBEAS, Bronn, 1837, Lethaea Geognos- 



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

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



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.] 

 AscooEKAs, 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 



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: Cenoliles, 



from kerion, a honey comb ; lithos, a 



stone, and a new family Ceriolidse. 

 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.] 

 complanaia, see Goniatites complanatus. 

 erato, see Goniatites erato. 

 Conilites, Schlotheim, 1820, Petrefactenkunde, 

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

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

 Tenn. Not satisfactorily defined. 

 CoNOCEEAS, Bronn, 18 35, Leth. Geogn. 

 [Ety. konos, a cone ; kera^, horn.] 

 angulosum, Bronn, 1834, Leth. Geogn., 

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

 Corwtubularia, Troost, syn. for Orthoceras. 

 brongniarti, see Orthoceras brongniarti. 

 cuvieri, see Orthoceras cuvieri. 

 defrancii, see Orthoceras defrancii. 

 goldfussi, see Orthoceras goldfussi. 

 Comdites, Cozzens, 1848. Not satisfactorily 

 defined. 

 angulosum, Cozzens, 1848. Not satisfac- 

 torily defined. It may be a plant. 



