Holloway. — Prothallus, &c, of Tmesipteris. 



399 





43 



Figs. 43a— 43e.— Young embryo in longitudinal section, showing irregular segmentation 

 of epibasal and hypo basal quadrants. X 135. 



Figs. 44a-44d. — Young embryo in longitudinal section, showing abnormal segmenta- 

 tion. In that marked D the transverse section of the prothallus is 

 shown at the point where the embryo was borne. A to C X 180 ; D X 66. 



Figs. 45a-45f. — Young embryo in longitudinal section, showing abnormal segmenta- 

 tion. X 135. 



