2 32 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 ('92)' 

 (On Palaeontology) 



Nephrorchidic 



(Elasmobranchs 



Batraehians 



Amniotes) 



L A 



thorchidic 



(Ganoids 



Teleosts 



Marsipobranchs 



Dipnoans) 



Haeckel('93)* 



(On General Anatomy) 



Ci ossopterygiana 



Rays 



Cycles tome 



Selachian 



Palaedipneusten 



Proganoid \ 



. Dipnoau ' 



\ \ 



Ganoid and \ 



Teleost Amphibian 



lUy 



Klaatsoh ('93) 



(On Axial Skeleton) 



Cartilaginous 

 Chordal Verte- 

 brae 



Perichordal Cartilaginous 

 Vertebrae 



W.N. Parker ('92)* 

 (On General Anatomy) 



Shark Acipenser \ Teleost 



Lepidosteus 

 Cope ('85)* 

 (On General Anatomy and Palaeontology) 



Chimaeroid 



Ichthyotome 



Burekhardt ('92) 

 (On Central Nervous System) 

 Selachian / v Petromyzon 



7 



Retziua ('98) 



(Nervous System and End Organs) 



Ceratodus 



Dipnoan 



\ 



Protopterua 



Reptile 



Myxine 



Proganoid A 

 Acipenser 



Amphibia 



Teleosts 



Bony Ganoids 



Petromyzon 



