PLATE XXV. 



A. PORPHYRA, page 216. 



Fig. 1, P. laciniata ; the natural size. 2, portion of 

 the membrane; magnified. 



B. ULVA, page 216. 



Fig. 1, U. latissima ; the natural size. 2, portion of 

 the membrane ; magnified. 



C. BANGIA, page 217. 



Fig. 1, B. fusco-purpurea ; tuft, the natural size. 2, 

 portions of filament. 3, transverse section of a fila- 

 ment; magnified. 



D. ENTEROMORPHA, page 213. 



Fig. 1, J. compressa; the natural size. 2, small por- 

 tion of the same ; magnified. 



E. OCHLOCH^TE, page 211. 



.Fz<7. 1, 0. hystrix ; fronds, the natural size, parasitical 

 on a leaf of grass. 2, one of the tufts ; magnified. 

 3, portion of a filament from the same ; very highly 

 magnified. 



