G. R. Wielancl — American Fossil Gycacls. 



it 



being 



held certain that these flowers uniformly bore 



tinct, 



disks — were truly bi- or " amphisporangiate." In the sections 

 cut from the largest cone, figure 5, the testal walls are clearly 

 outlined by zonal conservation and oue may plainly see the 

 more or less collapsed nucellar sacks in the seed interiors. 



Notwithstanding this well advanced ovulate growth of the 

 great majority of the axes of trunk 3, it still seems probable 

 that amongst the numerous remaining bract groups, various of 

 which are indicated by the arrows of figure 1, a few may still 



Fig. 2 A. 



Fig. 2 B. 



T.3.KS728.X3 



S.7\3+7\4 



Fig. 2. Cycadeoidea Marshiana. [4 x 2'5. B x 1*5.] 



A. Longitudinal section through ovulate cone, fruit No. 3 of Yale trunk 

 No. 3. As the section finally passes out a little to one side of the strobilar 

 axis the terminal brush does not appear. At S remnant of disk collar. 

 Compare with figure 7. 



B. Longitudinal section of bisporangiate strobilus of Yale trunk No. 3, 

 composed from two nearly tandem sections, Nos. 713 and 714. The disk has 

 either wilted loose prematurely or is on the point of dehiscence, having left 

 at S precisely the same remnant of the campanular insertion as at S in A. 



The microsporophyll rachides with short pinnules appear in solid black, 

 but the decurved rachidal tips do not traverse the central axis, the section 

 being slightly tangential, as may be exactly noted in figure 3 A of the trans- 

 verse section 761. Compare by number or letter the complementary trans- 

 verse sections as illustrated in figure 3. 



enclose complete flowers. But in view of the results recited 

 further search was abandoned and the parts of core No. II 



