BIOLOGICAL CLASSIFICATION. 1423 



Family PlectoceratiD/E Hyatt. 

 Plectoceraa Hyatt, Spbyradoceras Hyatt. 



Family LrrurriD,E Noetling. 



Ancistroceras Ball, Cyclolituites Remele, Lituites Breynius, Rhyiichortli.., 

 Remele. 



Family HaijloceratiD/E Hyatt. 

 Zitteloceras Hyatt. 



Family Nautilid^; Owen. 

 Nautilus Linnaeus. 



Family Loxoceratid^e Hyatt. 

 Loxoceras McCoy. 



Family Actinoceratid^e Saemann. 



Actinoceras Brown, Cyrtactinoceras Hyatt, Deiroceraa Hyatt, Discosorus Hall, 

 Gonioceras Hall, Huronia Stokes, Faractinoceras Hyatt, Tripteroceras Hyatt. 



Family Jovellanid^e Hyatt. 



Jovellania Bayle, Tripleuroeeras Hyatt. 



Family Rizoceratid^e Hyatt. 



Cyrtorizoceras Hyatt, Rizoceras Hyatt. 



Family Ooceratid^e Hyatt. 



Cyrtoceras Goldfuss, Ooceras Hyatt. 



Family Oncoceratid;e Hyattr. 



Cyclostomiceras Hyatt, Eremoceras Hyatt, Meloceras Hyatt, Oneoceras Hall. 



Family PoterioceratiD/E Foord. 



Clinoceras Mascke, Poterioceras McCoy, Streptoceras Billings. 



Family Trimeroceratid^e Hyatt. 



Hexameroceras Hyatt, Pentameroceras Hyatt, Septameroceraa Hyatt, Trimeroceras 

 Hyatt. 



Family Phragmoceratid^c Hyatt. 



Gomphoceras Sowerby, Phrapmoceras Sowerby, rrotopbia^moeeras Hyatt. 



Phyllum ARTHROPODA. 

 Subphyllum Branchiata. 



Class CRUSTACEA. 



Subclass Trilobita. 



Order Hypoparia. 

 Family Agnostid.e McCoy. 

 Agnostua Brongniart, Artbroraebis Corda, Lejopygc Corda. 



Family Shumardiid;e Lake. 

 Shumardia Billings. 



Family Harpedid/E Corda. 

 Eoharpes Raymond, Harpes Goldfuss, Harpides Beyrich. 



