86 G. R. Wieland — American Fossil Cycads. 



the largest of the ten axes so far studied. (Cf. fig. 6.) — A fairly 

 well grown or mature C.dacotensis cone is shown in my Amer- 

 ican Fossil Cycads, p. 67, under the name C. Marshiana, and 

 on the opposite page 66, under the latter name, a form that 

 belongs to some third species not yet satisfactorily determined. 

 Cone species and the later growth of cones is, however, a long 

 and difficult subject which cannot be taken up in connection 

 with discussion of the partly uncertain growth stage of the 

 flower before us. 



II. Flower-Buds of Yale Specimen No. 164. — Figures 8, 9. 



This superb silicihed cycad was made the subject of special 

 description with reference to branching in my American Fossil 



Fig. 8. 



2.0 cm, 



^ ^l^ftitfirt^ti^ " 



Fig. 8. Cycadeoidea Marshiana. "Yale trunk No. 129. 



Exceptionally handsome trunk with fruits small and young, but of the 

 same type as those of figure 9. Minnekahta, South Dakota. 



Cycads (structure), pages 41-43, and illustrated in relief on 

 Plates VII and VIII. Here too, small fruits were supposed 

 to be young until several thin sections showed the presence of 

 mature flowers adjudged to be of the same species as those of 

 trunk Xo. 3, although sections of the ovulate cones yet require 

 to be cut, — this task not being relatively urgent since no change 

 of name is involved in the specific reference of this cycad here 

 and earlier made. 



