Specif!^ of Cycadeoidca from 3fari/laii<l. 17 



The above arrangement of the seven species of Cycadeoidea from the 

 Iron Ore beds of ^laryhmd is intended to be that of their affinities, as in- 

 • licated by the characters described, taking the original C. Marylandicn 

 as the point of departure and eonchiding with the C, Bibbinsi, which ex- 

 hil)its the widest divergence from that norm. C. Tysoniana, C. McGeeana^ 

 and C. ia»)i/«/;(m«a represent a somewhat gradual transition. C. GoiicJur- 

 iaiKt and C. Uhleri represent abrupt divergences in different directions, 

 wliile C. Bibbind, as already stated, constitutes a distinct group. 



3— Bioi.. Soc. Wash, Voi, XI, 1.S97 



