PLATE XXVIII. 



PAGE. 

 Fig. 1. CAULOPTERIS OBTECTA, ?pec. nov , one-fourth natural size . . .451 



Fig. 2. Same specimen, on the reverse. 

 Fig. 3. Branch cicatrice of the same, natural size. 



Fig 4. Part of the surface, showing rootlets in relative p sition, either naked, or with 

 a carbonaceous pellicle. 



