Arthrodires 597 



shows that the fossil might as easily be considered a Chimacra 

 as a lamprey, and repeats his conviction that it is a larval 

 form of which the adult is still unrecognized. 



We cannot go much farther than Dr. Dean's statement in 

 1896, that it belongs "among the curiously specialized offshoots 

 of the early Chordates." 



