Xll 



SCHEME OF CLASSIFICATION 



III. CEPHALOCHORDATA (pp. 4, 112). 



IV. CRANIATA (pp. 4, 141). 

 Class Cyclostomata (pp. 145, 150, 421). 



Family. 



Branchiostomatidae 

 (p. 137). 



Sub-Class. 



Order. 



Sub-Order. 



Family. 



Myxinoides (p. 421) 



"l Petromyzontes 



(p. 425) 



Myxinidae (p. 422). 

 Bdellostomatidae (p. 423). 



Petromyzontidae (p. 426). 



Class Pisces (pp. 145, 431). 



ELASMO- 

 BRANCHII 



(p. 431) 



TELEOSTOMI 



(P- 475) 



PLEUROPTERYGII 



(p. 436) 



ICHTHYOTOMI 



(p. 438) 



ACAXTHODEI 



(p. 440) 



Plagiostomi (p. 442 



Holocephali (p. 466)- 



Crossopterygii 



(p. 476) 



Chondrostei 



(p. 485) 



(Continued on the next page.) 



Cludoselachidae (p. 438). 



Pleuracanthidae (p. 440). 



Diplacanthidae (p. 441). 



Acanthodidae (p. 441). 



Notidanidae (p. 442). 



Chlamydoselachidae (p. 443). 



Heterodontidae (p. 444). 



Cochliodontidae (p. 445). 



Psammodontidae (p. 446). 



Petalodontidae (p. 446). 



Scylliidae (p. 446). 

 Selachii (p. 442) Carchariidae (p. 448). 



Sphyrnidae (p. 449). 



Lamnidae (p. 450). 



Cetorhinidae (p. 453). 



Rhinodontidae (p. 454). 



Spinacidae (p. 454). 



Rhinidae (p. 456). 



Pristiophoridae (p. 457). 



Pristidae (p. 459). 



Rhinobatidae (p. 460). 



Raiidae (p. 461). 

 Batoidei (p. 457) * Tamiobatidae (p. 462). 



Torpedinidae (p. 462). 



Trygonidae (p. 464). 



Myliobatidae (p. 465). 

 ( Ptyctodontidae (p. 468). 

 I Squaloraiidae (p. 468). 

 ~| Myriacanthidae (p. 468). 

 I Chimaeridae (p. 468). 

 C Osteolepidae (p. 477). 

 OSTEOLEPIDA \ PMzodontidae (p. 478). 

 (p. 477) j Huloptychidae (p. 479). 



V. Coelacanthidae (p. 480). 

 Cladistia (p. 481) Polypteridae (p. 481). 

 r Palaeoniscidae (p. 486). 



Platysomidae (p. 487). 



Belonorhynchidae (p. 488). 



Catopteridae (p. 488). 



Chondrosteidae (p. 489). 



Polyodontidae (p. 491). 



Acipenseridae (p. 492). 



