PLATE 68. 



Fig. 1. 



314. 1. Sphenothallus angvstifolitts. 



(Pag. 261.) 



Fig. 2. 



315. 2. Sphenothallus latifolius. 



(Pag. 262.) 



'2 a. A leaf nearly entire, showing a depressed line along the centre. 



2 b. A similar leaf, with a sharp ridge along the centre. 



2 e. A leaf of a narrower and more elongated form, with a broad ridge along the centre.', 



2 d. Another fragment, with a ridge extending a part of the length. 



2 e,f. Fragments of what may have been stems of this plant 



Fig. 3. 316. 4. BUTHOTREFHIS SUBNODOSA. 



3 a, b. Figures of imperfect specimens, illustrating the prevailing form of the species. 



(Pag. 262.) 



