214 



PI. CL. Fig. 1 : frond of Halinicda incrassata Lam. f. lypica 

 Barton, \. Fig. 2 : longitudinal section cut parallel to the surface 

 of frond, slightly magcl. ; showing fusion of filaments of central 

 strand at the apex of the lower joint, slightly magd. Fig. 3 : 

 filaments of central strand in longitudinal view, showing earlier 

 stage of fusion where pits are not yet formed, ^-. Fig. 4 : fusion 

 of filaments more advanced, showing pits at the point of fusion, 

 iy5. Fig. 5 : partly optical transverse section through apex of 

 joint, just below the ends of the fused filaments ; shewing the 

 whole of the central strand ; shaded portion indicates interior of 

 the filaments, ^~-' Fig. 6 : surface view of peripheral cells in 

 calcified state, ? f. Fig. 7 : longitudinal view of peripheral cells, . 



Halimeda incrassata Lam. f. typica Barton. 



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