1923] A New Species of Thraustotheca 115 



Fig. 8. Two sporangia, one just after the complete separation of the tip. 

 Fig. 9. A nearly empty sporangium showing the arrangement of the spores 



after expulsion. Many have escaped from their cysts. 

 Fig. 10. A group of oogonia with antheridia, showing habit. 

 Fig. 11. Two sporangia and two oogonia, one of the former intercalary and with 



two mouths; one oogonium abnormal. 



Fig, IL'. Oogonium showing a mature egg, surface view, and an empty antheri- 

 dium Avith tube. 



Fig. 13. As in figure 12, but egg shown in optical section. 



Figs. 3-6, 10x108; figs. 1, 2, 8, 9, 11x167; figs. 12, 13x247; fig. 

 7 X 720. 



