I2 4 



CHONDRICHTHYES 



Elasmobranchs which have lost the claspers, or an early offshoot 



Selachii 



EJa's'mobra'nchii / _/ 



Chondrichthyes 



DIAGRAM II. 



Diagram illustrating the Phylogeny of the Chondrichthyes, and their distribution in the 

 geological strata. The actual range of distribution is shown in black ; the dotted lines indicate 

 hypothetical connections. 



sprung from the Chondrichthyan stem before claspers were developed. 

 The affinities of the Acanthodii are still less clear. 



