A.— TABLE OF THE NAUTILOIDEA. 
Family OETHOCEEATID^ M^Coy, 1844. 
Ortho CEBAS, Breyn, 1732. 
Family ENDOCEEATID^, Hyatt, 1883. 
Endoceras, Hall, 1847. 
PiEO GERAS, Salter, 1859. 
Family ACTINOCEEATID^, Saemann, 1854. 
Actixoceras, Bronn, 1837. 
Discosorus, Hall, 1852. 
Huroxia, Stokes, 1824. 
Sactoceras, Hyatt, 1883. 
Family GO]MPHOCEEATn)^, Pictet, 1854. 
Gohpho GERAS, J. de Carle Sowerby, 1839. 
Tetramerogeras, Hyatt, 1883. 
Hexamero GERAS, Hyatt, 1883. 
^Mesogeras, Barrande, 1877. 
^Trimero GERAS, Hyatt, 1883. 
^Pextamerogeras, Hyatt, 1883. 
^Septauerogeras, Hyatt, 1883. 
Famdy ASCOCEEATIBAE, Barrande, 1867. 
Asgogeras, Barrande, 1847. 
Glossogeras, Barrande, 1867. 
Family POTEEIOCEEATID^, Foord, 1888. 
PoTERioGERAS, M^Coy, 1844. 
^Eremogeras, Hyatt, 1883. 
*Clixogeras, Maske, 1876. 
^ These Families do not always include the genera originally embraced in 
them, many of the latter having been rearranged in accordance with more 
recent systems of classification. 
* Genera not represented in the collection, but noticed or described in the 
text, are distinguished by an asterisk. 
