(lull red-brown or lurid-purple, varying in intensity with the depth of water. 

 The subdance is firm and somewhat rigid, more coriaceous than fleshy, 

 and in (h'ying the frond scarcely adheres to paper, or altogether refuses to 

 adhere. 



Tills is a variable species chiefly in the width of the segments, 

 and in the greater or less abundance of the leafy marginal and 

 discal processes. Some specimens are not unlike Gracilaria 

 corticata, or some of the narrower forms of Chondrus crispus ; 

 but in many cases the tendency to form marginal leaflets is so 

 excessive as to produce a densely crowded mass of segments, 

 spreading in all directions. 



Though the tetrasporic fruit has not yet been seen, there seems 

 but little reason for doubting that this plant belongs to Gymno- 

 gongrus. 



rig. 1. Gymnogonguus foliosus, — a broad variety. 3. The same, a narrow 

 variety : — l>oth of the natural size. 3. Longitudinal section of the frond. 

 4. Transverse section through frond, and half a couceptacle : — iiia(jnijled. 



