REVISED LIST OF MARINE AhGJE. 95 



certain Phaeophyceae also. After the tetraspores have 

 been shed the cell next below the empty sporangium 

 grows up within the empty cell-wall and by abstriction 

 and segmentation of its contents forms a new sporangium. 

 This process may be repeated several times. For per- 

 mission to reprint Plate III. I am indebted to the 

 courtesy of the Council of the Linnaean Society. 



Callithamnion poly sper mum, C. Ag. 



Hilbre I. !. Puffin I. !, Anglesea !, I. of Man. 

 C. roseum, Harv. 



Hilbre I.!, I. of Man. 

 C. hookeri, C. Ag. 



Puffin I. !, New Brighton, I. of Man. 

 C. arhuscula, Lyngb. 



I. of Man. 

 G. tetragomun, C. Ag. 



Puffin I.!, I. of Man. 

 var. hrachiatum, J. Ag. 



I. of Man. 

 C. corymhosum, Lyngb. 



Hilbre I. !, Puffin I. !, I. of Man. 

 C. granulatiim, C. Ag. 



Puffin I.!, I. of Man! 

 C. seirospermum, Griff. 



Hilbre I.!, I. of Man. 



Tribe V. — Compsothamnieae. 

 Compsothamnion thuyoides, Schmitz. 



I. of Man. 

 C. graciUimum, Schmitz. 



Beaumaris (fide Gulson). 

 Tribe YI.— Ptiloteae. 

 Ptilota plamosa, C. Ag. 



Puffin I. !, Hilbre I. !, I. of Man !, Holyhead. 



