EVOLUTIONARY TENDENCIES AMONG GYMNOSPERMS 409 



so far as the records are available, and are so connected by intergrad- 

 ing (or rather anastomosing) forms that their relationship seems 



'lurian 



Orl 



mician 



Cambi 



<rian 



Fig. 461. — A more detailed diagrammatic presentation of tlie connections sug- 

 gested in fig. 460. — Prepared by Sister Helen Angela. 



evident. The Cycadofilicales are so fernlike in every feature except 

 their seeds, that their derivation from some ancient fern stock 



