Humphrey : OBSERVATIONS ON Gigartina exasperata HARV. 607 
Figure 8. Protoplasmic connections between cells of pseudo-medul- 
lary area.  X 9QOO. 
Figure 9. An early stage in development of a proliferation showing 
growing point (@). 450. 
Figure 10. A portion of the margin of a frond showing prolifera- 
tions and cystocarps. 
Figure 11. Longitudinal section of mature cystocarp. O, carpo- 
stome; @, conceptacle. 
Figure 12. Portion of tissue surrounding a conceptacle showing cell 
muclei. 700. 
Figure 13. Cross section of mature cystocarp showing spores. 
Figure 14. Two groups of spores separated by elongated sterile 
Gells.  I50O. 
Figure 15. Immature carpospores still attached to the gonimo- 
blastic filaments; (@) a spore separating from filaments. x 48o. 
