BIOLOGICAL CLASSIFICATION. 1421 



Family BUCANIID;E Ulrich and Scofield. 



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

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

 ttis Hall. 



Family BELLEROPHONTID^E McCoy. 



Bellerophon Montfort, Bucanopsis Ulrich. 



Family CAKINAROPSID^E Ulrich and Scofield. 

 Carinaropsis Hall. 



Family PLEUROTOMARIID^E D'Orbigny. 



Cataschisma Branson, Clathrospira Ulrich and Scofield, Ccelocaulus (Ehlert, Ecto- 

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

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

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

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

 Ulrich, Turritoma Ulrich. 



Family EUOMPHALID^E Dekoninck. 



Ceratopea Ulrich, Eccyliomphalus Portlock, Eccyliopterus Kemele, Euomphalus 

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

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

 Weller, Straparollina Billings, Straparollus Montfort. 



Family RAPHISTOMID^E Ulrich and Scofield. 



Eiiomphalopterus Roemer, Omospira Ulrich, Raphistoma Hall, Raphistomina Ulrich 

 and Scofield, Scalites Emmons. 



Family TURBiNiro/E Adams. 

 Omphalotrochus Meek. 



Family TROCHONEMATID^E UHch. 



AcanthonemaGrabau, Bucanospira Ulrich, CallonemaHall, Codonocheilus Whiteaves, 

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

 Holopea Hall, Pleurotrochus Grabau, Poleumita Clarke and Ruedemann, Strepto- 

 trochus Perner, Strophostylus Hall, Trochonema Salter. 



Order CTENOBRANCHIATA. 



Suborder HETEROPODA. 



Pelagiella Matthew. 



Suborder PLATYPODA. 



Family LOXONEMATID^: UWch. 

 Loxonema Phillips, Meekospira Ulrich. 



Family SUBULITID^J Miller. 

 Cyrtospira Ulrich, Fusispira Halt, Subulites Conrad. 



Family CAPULID^: Cuvier. 



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

 Stenotheca Salter, Vallatotheca Foerste. 



UNCERTAIN PLACE. 



Clisospira Bill* igs, Matherella Walcott, Omphalopterus Roemer, Palaeopupa Foerste, 

 Pycnomphalus Lindstrom, Scsevogyra \Vhitfield. 



