180 TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY 



then it seems that Dr. Jordan must have overlooked or underestimated the striking and 

 detailed resemblances in the jaw parts and skull as a whole between the modern and the 

 Eocene genera, as clearly figured by Woodward. In this connection Jordan cites Dr. 

 Cockerell's view {in Hi. May 13, 1922) as follows: "... I suppose the Gonorhynchid type 

 of scales, originating during the Mesozoic, may have persisted in several distinct branches 

 of the original stem, of which our modern Gonorhynchidse constitute one only. One of the 

 other branches would be represented by Notogoneus. I think the resemblance is too close 

 for convergence from entirely different stems." 



