P/SCES. 585 



Order Crossopterygia. 



Family C<elacanthid,e. — Coelacanthus. 



Family Crossopterygid,e. — Ceratodus, Conchodus, Ctenodus, Heliodus, 



Onychodus, Peplorhina. 

 Family DipteriI)/E. — Dipterus, Gnathorhiza, Ptyonodus. 

 Family Holoptychid;e. — Glyptolepis, Holoptychius. 

 Family Phaneropleuronid^e. — Phaneropleuron. 

 Family Rhizodontid^e. — Eusthenopteron, Rhizodus. 



Order Ginglymoda. 



Family Lepidostetd^e. — Acrolepis, Amblypterus, Eurylepis. 



Order Placodermata. 



Family Cephalaspid^;. — Acauthaspis, Aeantholepis, Cephalaspis. 

 Family Coccosteidje. — Coccosteus, Dinichthys, Liognathus. 

 Family Pteraspid^e. — Diplaspis, Palseaspis. 



Family Pterichthyem;. — Aspidichthys, Bothriolepis, Pterichthys. 

 Family Uncertain. — Mycterops. 



Order Pycnodonta.. 



Family Pycnodontid^e. — Platysomus. 

 Family Uncertain. — Ectosteorachis. 



SUBCLASS SELACHIA. 

 DIVISION HOLOCEPHALA. 

 Order Chimeroididea. 

 Family Chimeroidid./E. — Cyrtacanthus, Liognathus, ♦Machseracanthus, Ptyc- 

 todus, Rhinodus, Rhynchodus. 



DIVISION PLAGIOSTOMATA. 

 Order Squalina. 



Family CocHLio-DONTiDiE. — Chitonodus, Cochliodus, Cymatodus, Deltodopsis, 

 Deltodus, Beltoptychius, Helodus, Orodus, Orthopleurodus, Petrodus, 

 Platyodus, Poecilodus, Psephodus, Sandnlodus, Stenopterodus, Tseniodus, 

 Tomodus, Trigonodus, Vaticinodus, Xystrodus. The Cochliodontidse 

 commenced at the base of the Subcarboniferous, reached their greatest de- 

 velopment in the same geological system, and only one genus, Orthopleu- 

 rodus, is found as high as the Coal Measures. 



Family Hybodontid^e. — Agassizodus, Apedodus, Bathychilodus, Carcharop- 

 sis, Cladodus, Diplodus, Hybocladodus, Janassa, Lambdodus, Liodus, Me- 

 sodmodus, Orodus, Periplectrodus, Phcebodus, Pristicladodus, Stemmatodus, 

 Thrinacodus, Polyrhizodus. 



Famdly PETALODONTiDiE. — Antliodus, Calapodus, Cholodus, Chomatodus, 

 Ctenopetalus, Ctenoptychius, Dactylodus, Desraiodus, Fissodus, Harpaco- 

 dus, Lisgodus, Peltodus, Peripristis, Petalodus, Petalorhynchus, Polyrhi- 

 zodus, Pristodus, Tanaodus, Venustodus. 



