282 



FISHES. LIVING AND FOSSIL 



XIX. THE SUPPOSED DESCENT 



Interrelationships and lines of descent as suggested by a number of 

 noted on each scheme. * Denotes that the diagram is the present writer's 



Howes ('91)* 



(On TJrino Genital System) 



Smith Woodward ('»2)* 

 (On Palaeontology) 



I 



Nephrorchidic 



(Ela>iiiobi-aDchs 



Batiachians 



Amniotes) 



Enthorchidic 



(Ganoids 



Teleosts 



Marsipobranchs 



Dipnoans) 



Ostracodemis 



Marsipo- 

 tranchs 



llaeekel (*98)* 

 (On General Anatomy) 



Cyclostome 



Selachian 



Proselachian 



Chimaeroid 



Palaedipneusten 



Proganoid 



Teleosts 



Ganoids 

 Ci ossoplerygians 



\ 



Ganoid and 

 Teleost 



\ 



Dipnoan 



\ 



Amphibian 



Dipnoans and 

 Arthrodira 



Sharks 



Klaatsch ('98) 



(On Axial Skeleton) 



Cartilaginous /\ Perichordal Cartilaginous 

 Chordal Verte-^^i f"**^ Vcrlcljrue 



brae 



Rav 



W.N.Parker ('92)* 



(On General Anatomy) 



Ancestral Stem 



of Amphibians 



and Fishes 



Cyclos- 

 Chiuiaera \ \ \ tome 



Shark Acipenser' \ Teleost 



Lepidosteus 

 Cope ('85)* 

 (On General Anatomy and Palaeontology) 



Amphibian 

 Dipnoan 

 Ganoid 



Ichlhyotome 



Selachian 



Burekhardt ('92) 



(On Central Nervous System) 

 Selachian / v Petromyzon 



Teleost 



Chimaeroid 



7\ 



^___. Dipnoan 



Ganoid — ^ [ / >. 



Dipnoan 



\ 



Amphibian 



Elarimobranch 

 ' Crossopterygian 

 ' Choudrostei 



KetziuM ('98) 



(Nervous System and End Organs) 



Protopterus 



Teleost 



Reptile 



IMyxine 



Proganoid 

 Acipenser 



Amphibia 



Teleosts 



. Petromyzon 



Proselachian 



. Chimaera 



Shark 



