BIOLOGICAL CLASSIFICATION. 1421 



Family Bucaniid;e Ulrich and Scofield. 



Bucania Hall, Kokenospira Bassler, Megalomphala Ulrich, Oxydiscus Koken, Phrag- 

 niolitcs Conrad, Salpingostoma Roemer, Tetranota Ulrich and Scofield, Tremano- 

 tus Hall. 



Family Bellerophontid,e McCoy. 



Bellerophon Montfort, Bucanopsis Ulrich. 



Family Carinaropsid^e Ulrich and Scofield. 

 Carinaropsis Hall. 



Family Pleurotomaried/E D'Orbigny. 



Cataschisma Branson, Clathrospira Ulrich and Scofield, Coelocaulus CEhlert, Ecto- 

 maria Koken, Eotomaria Ulrich, Euconia Ulrich, Hormotoma Salter, Liospira 

 Ulrich and Scofield, Lophospira Whitfield, Loxoplocus Fischer, Monrlonia Deko- 

 ninck, Murchisonia D'Archiac and Verneuil, Phanerotrema Fischer, Plethospira 

 Ulrich, Pleurotomaria Sowerby, Schizolopha Ulrich, Seelya Ulrich, Sinuopea 

 Ulrich, Turritoma Ulrich. 



Family Euomphalid^e Dekoninck. 



Ceratopea Ulrich, Eccyliomphalua Portlock, Eccyliopterus Remele, Euomphalus 

 Sowerby, Helicotoma Salter, Maclurina Ulrich and Scofield, Maclurites Lesnenr, 

 Ophileta Vanuxem, Ophiletina Ulrich and Scofield, Pleuronotus Hall, Polygyrata 

 Weller, Straparollina Billings, Straparollus Montfort. 



Family Raphistomid/E Ulrich and Scofield. 



Euomphalopterus Roemer, Omospira Ulrich, Raphistoma Hall, Raphistomina Ulrich 

 and Scofield, Scalites Emmons. 



Family Turbiniid.e Adams. 

 Omphalotrochua Meek. 



Family Trochonematid/E Uhich. 



Acanthonema Grabau, Bucanospira Ulrich, CallonemaHall, Qpdonoeheilus Whiteaves, 

 Cyclonema Hall, Cyclora Hall, Dyeria Ulrich, Eunema Salter, Gyronema Ulrich, 

 Ilolopea Hall, rienrotroehus Grabau, Poleumita Clarke and Ruedemann, Strepto- 

 trochua Perner, Strophostylus Hall, Trochonema Salter. 



Order Ctenobranchiata. 

 Suborder Heteropoda. 



Pelagiella Matthew. 



Suborder Platypoda. 

 Family Loxonematid.e Ulrich. • 

 Loxonema, Phillips, Meekospira Ulrich. 



Family Subulitims Miller. 

 Cyrtospira Ulrich, Fusiapira Hall, Subulites Conrad. 



Family Capulid^; Cuvier. 



Diaphorostoma Fischer, Hercynella Barrande, Orthonychia Hall, Platyceras Conrad, 

 Stenotheca Salter, Vallatotheca Foerste. 



UNCERTAIN PLACE. 



Clisospira Bill'" lgs, Matherella Walcott, Omphalopterua Roemer, Palaeopupa Foerste, 

 Pycnomphalus Lindstrom, Scsevogyra Whitfield. 



