Species of Cycadeoidea from Maryland. 17 



The above arrangement of the seven species of Cycadeoidea from the 

 Iron Ore beds of Maryland is intended to be that of their affinities, as in 

 dicated by the characters described, taking the original C. Marylandica 

 as the point of departure and concluding with the C. Bibbinsi, which ex 

 hibits the widest divergence from that norm. C. Tysoniana, C. McGeeana, 

 and C. Fontaineana represent a somewhat gradual transition. C. Goucher- 

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

 while C. Bibbinsi, as already stated, constitutes a distinct group. 



3 BIOL. Soc. WASH, VOL. XI, 1897 



