282 



FISHES, LIVING AXD 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 TTrino Genital Sy&tem) 



/ \ 



Smith Woodward ('yS)* 

 (On Palaeontolopy) 



Nephrorchidic 



(EIasmobrant:hs 



Batraehians 



Amniotes) 



EuLliorchidic 



(Ganoids 



Teleosts 



Mars-ipobranchs 



Dipnoans) 



Ostracodeiins 



Ulareipo- 



"branchs 



lIaeckelC9S)* 



(On General Anatomy) 



Proselachian 



:•""•■• 



Ganoids 

 Crbssopterygiana 



Dipnoans and 

 Arthrodira 



Cyclostome 



Selachian 



\ 



Chimaeroid 

 Palaedipneusten 

 Proganoid 



\ 



Ganoid and 



Teleost 



Rays 



' Sharks 



Klaatseh C98) 



(Ou Axial Skeleton) 



Perichordal Cartilaginous 

 Ve lie brae 



W.N.Parker ('92)* 



(Ou Genera] Anatomy) 



Ancestral Stem 



of Amphibians 



and Fishes 



Chtmaera 

 Shark Acipenser \ Teleost 



Lepidosleiis 

 Cope ('85)* 

 (On General Anatomy and Palaeontology) 



Amphibian 

 Dipnoan 

 Ganoid 



Ichthyotome 



Selachian 



Ganoid - 



Burckhardt C92) 



(On Central Nervous System) 



Selachian / v Petromvzoa 



/\ 



Dii>u 



/ \ 



Teleost 



Chimaeroid 



Dipnoan 



\ 



Amphibian 



Ela.smobrauch 

 'Crossopterygian 

 ^ChouJrostei 



Retzlu»» ('93) 



(Xervous System and End Organs) 



Dipnoan 



/ 



Ceralodus 



Hyxine 



Protopterus 



Petrorayzoa 



Tekost 



Reptile 



Amphibia 



Teleosts 



Shark 



