CORDAITEAE 



549 



not enter the nucellus, a course which resembles that 

 in the seeds of recent Cycads, as interpreted by many 

 observers. In other respects the seed agrees with 

 Cordaicarpus. Two archegonia (ar), spherical in form, 

 are clearly shown ; between them, the endosperm has 

 an upward prolongation, which is interesting, as it 

 exactly corresponds to the structure found in Ginkgo 

 at the present day, and compared by Hirase to a 



TTU 



ar 



nu. 



ar 



Fit;. 198. — Cycartitiocarpus emgustodunensis. Upper part of seed, in longitudinal section, 

 int, integument; mi, micropyle ; nil, remains of nucellus; p.c, pollen -chamber, 

 containing pollen-grains ; the chamber has a long neck or canal, extending up into 

 the micropyle ; fir, endosperm ; ar, archegonia, -Magnified. After Renault. 



tent-pole, supporting the nucellar membrane, which 

 represents the tent. The pollen-chamber (pc), with 

 its long neck rising up into the micropyle (mi ; cf. 

 Figs. 196 and 197), contains pollen-grains. Only the 

 sclerotesta (int) of the seed is shown in the figure. 



Although so many Pteridospermous and Gymno- 

 spermous seeds have been discovered in the Carboni- 

 ferous formation, and often in a wonderful state of 



