xxiv STUDIES IN FOSSIL BOTANY 



FIG. I'AGE 



194. Cordaianthus Williamsoni. A. Somewhat tangential section of 



a female catkin. B. Ovule ..... 54° 



195. Cordaianthus Grand' Euryi. A. Longitudinal section of female 



flower. B. Canal of pollen-chamber. C. Grains of pollen S4 2 



196. Cycas. Longitudinal section of ovule 543 



197. ,, Poll en -chamber enlarged . . 543 



198. Cycadinocarpus augustodunensis. Upper part of seed . - 549 



199. Cycadeoidea marylandica. The earliest described American fossil 



Cycad ... . : 55^ 



200. Bennettites Gibsonianus. A. Stem in transverse section. B. 



Stem in tangential section . . . S^ 1 



201. Bennettites Saxby 'anus. Transverse section of stem . . 5^3 



202. Bennettites Gibsonianus. Longitudinal section of a fructification 568 



203. ,, ,, A. Diagram of the fruit in radial 

 section. B. Ramenta, in transverse section. C. Transverse 

 section of a seed. D. Somewhat oblique longitudinal section 

 through the micropyle of a seed . . . 569 



204. Bennettites Gibsonianus. Transverse section of fruit 57 2 



205. ,, ,, Longitudinal section of seed . . 574 



206. Cycadeoidea dacotensis. Median longitudinal section of a bisexual 



flower 581 



207. Cycadeoidea dacotensis. Longitudinal section through the summit 



of an unexpanded bisexual flower . . 583 



208. Cycadeoidea ingens. Restoration of bisexual flower 584 



209. ,, ,, Plan of the bisexual flower 585 



210. Cycadeoidea dacotensis. Transverse section of synangia 586 

 2X1. ,, ,, Longitudinal section of a synangium 587 



212. Williamsonia gigas. Williamson's original restoration . . 591 



213. Tmesipteris. A. Somewhat diagrammatic radial section of 



synangium and part of sporophyll. B. Transverse section . 629 



