﻿OVULATE CONES. 



'33 



CYCADEOIDEA DACOTENSIS(?). (Fig. 66.) 



A fragment of a nearly cylindrical trunk from Minnekahta (No. 505) bears 

 various fruits, as shown in figure 28. Also, photograph 5 (plate xijii) represents 

 a portion of the eroded surface of one of the cones, which displays very clearly 

 the seed zone and the distinctly conical form of the receptacle on which the pedicels 

 are borne; and plate xxxn with the opposite figure 66 shows the same fruit in some- 

 what obliquely longitudinal thin section, this obliquity causing the rounded appear- 



•S'- 



40jL 



Fig. 67. — Cycadeoidea Marshiana. Longitudinal section 404 through 

 ovulate strobilus cut from T. 229. Natural size, s, Remnant of 

 dehiscent disk. The planes of the serial transverse sections accompany- 

 ing are indicated by their respective section numbers. See figure 67a. 



auce of the upper portion of the truly conical receptacle as cut hyperbola-like. The 

 seeds are 4 mm. in length by 1 mm. in diameter, and therefore relatively much 

 more advanced in growth than those of specimen 710, just described. Nevertheless, 

 in general form the fruit is shorter and more robust, the apical seeds especially being 

 supported by relatively far shorter pedicels. No. 710 and the present form therefore 



