DESCRIPTIONS OF THE SPECIES OF CYCADEOIDEA, OR 

 FOSSIL CYCADEAN TRUNKS, THUS FAR DETERMINED 

 FROM THE LOWER CRETACEOUS RIM OF THE BLACK 

 HILLS.' 



By Lester F. VV^ard, 



Associate Curator, IScction of ralcobotany. 



Within the past five years there have come into my hands for deter- 

 mination 155 si)ecimens of cycadean trunks, countiug the i)erfcct trunks 

 and the fragments or i>arts of trunks in all states of completeness and 

 of i)reservation, but exclusive of such duplicate fragments as are 

 known to belong to the same individual. Of these, 25 specimens belong- 

 to the U. S. National Museum ; 2 to the State School of Mines, South 

 Dakota^ 2 to the AVoman's College of Baltimore; and 12() to Yale Uni- 

 versity. Out of all this material I have distinguished 21 species, all 

 but one of which are new to science. The following are the species, 

 systematically arranged : 



1. Cijcadioidca dacotensis (McBride) AVaril euicucl. 



2. colossalis, uew species. 



3. icelhii, now species. 



4. miniiekaktensis, new species. 



5. pulchenima, uew species. 



6. cicatriciila, uew species. 



7. turrita, new species. 



8. mcbridci, uew species. 

 'J. marsliiana, uew species. 



10. f areata, uew species. 



11. colei, uew species. 



12. paijnd, uew species. 

 L'5. aspcra, uew species. 

 11. insolita, uew species. 



15. octidentalis, uew sp(!cies. 



1(5. Jciriwyana, uew si)ecies. 



17. ingcHu, uew species. 



18. forinosa, uew species. 



19. stillwclli, uew sjjecios. 



20. exceha, uew species. 



21. nana, new species. 



' Publishe«l -with the permission of the Director of the U. S. Geological Survey. 



Proceedings U. S. National Museum, Vol. XXI— No. 1 141. 



195 



