SUPPOSED DESCENT OF GROUPS 



283 



OF THE GROUPS OF FISHES 



observers ; their views have been based on the different lines of investigation 

 interpretation of the text of the author cited. 



Bailout- 080) 

 (On Embrvology and Anatomy) 



ISouR ( 9O) 



Ancestral Elasmobrancn ,/- r 1 ;.,,,, 



. (un ^jrcu 



Protoganoid 



Dipuoan GaDoid 



Bony Ganoids 



\ 



080)* 

 (On Anatomy) 



Includes Lancelet and Cyclostomes 

 as 2 Sub classes of Fishes 



Palaeichthys 



t Amphibia 



> Protopterus 



Ceratodus 



Teleost 



Gill 096) 

 (On Structural Characters) 



\ Teleos 



Ganoids 

 (With Dipnoans) 



Chondrosteans 



(Sharks and Chjmaeroids) 



-Pleuraeanthid 



Myxinr / I \ \ \Teleostome 

 Petromyzon / \ \Dipnoan 



Chimaeroid Elasmobranch 



Bridge 0?8) 



(On Osteology of Ganoids) 



Davldoff('80) 



(On Extremities and Girdles) 

 Primitive Gnathostome 



I I 



Scaphyrhynchus 

 Acipenser 



Polyodon 



Selachiau 



Shark Rays(?) 



I Chimaeroid 



Apueumato- 



cue la 



Elasniobrancli 



HepUnchus 



_Pneumato- 

 coela 



Polypterus 



Aiuia 



Lepidosteus 



Amphibia 



Physostome 



Selachoidei 



Teleos teoidei 



Kabl 089) 

 (On Embryology) 



A 



Cyclostomes Ampniox 



Beard 090) 

 (On Embryology and Brain) Selachians 



Ganoids 



Selachodichthyidae 



Pollard I 



(On Anatomy of Head) 



\Shark 



Crossopterygian 



Ctenodipterini 

 (Devon) 



Selachians 



Teleosts \Ampliibia 

 and Prutamnia 



Amphibia 



Ischyodus 

 (Jura) 



Holocephali 



Ceratodus 

 (Trias) 



/ Ceratodus 



Protopterus 



Dipnoans and 

 Amphibia 



