17 



Explanation of Plates. 



Plate I. 



Fig. 1. A small plant of Codium tomentosum. Nat.-size. 

 Fig. 2. Ehizoidal filaments, in some cases attached to 



and enveloping grains of sand. X 350. 

 Fig. 3. One of the palisade " cells " — narrow mucronate 



type. X 350. ^ 



Plate II. 



Figs. 4, 8, 9, 12. Various forms of vegetative develop- 

 ments from the abortive gametangia (?). X 350. 



Fig. 5. A " pahsade cell " with one empty, one full ripe, 

 and one developing sporangium. The same 

 cell bears the scar of a fallen sporangium, or 

 possibly, from its position high up on the cell, 

 a gametangium. X 350. 



Fig. 6. An adventitious bud after its isolation from the 

 parent "cell." X 3-50. 



Fig. 7. Gametangium (?) in process of forming a vegeta- 

 tive bud. X 350. 



Figs. 10 and 14. Stages in the development of the plug- 

 like septa. X 600. 



Fig. 11. A medullary hypha of a young plant, showing 

 mode of origin of the lateral "palisade cells." 

 X 300. 



Fig. 13. Apices of "palisade cells," (a) C. galeatum, (b) 

 C. mucronatum, var. tasmaniciwi, (c. d.) G. 

 tomentosum, (e.) C. mucronatum. c. d., X 

 550; a. b. e., after Agardh. 



