Structure of Hydroclathrus. 57 



EXPLANATION OF PLATES. 



9- 



PLATE XIV. 



Fig. i. Hydroclathrus sinuosus. Nat. size. 



Fig. 2. Section of thallus with young cryptostoma( x 250) 



a. Epidermal layer. 

 /; Inner cells of thallus. 

 c. Young cryptostoma. 



Fig. 3. Mature cryptostoma with young sporangia ( x 250) 



Fig. 4. ,, Part of sorus to show adult plurilocular sporangia 



(x 250). 

 Fig. 5. ,, Section of part of sorus, paraphyses having taken 



the place of sporangia ( x 250). 



Fig. 6. ,, Section of thallus of specimen from Anguilla, 



cryptostoma and paraphyses sunk in a 

 slight depression ( x 250). 



PLATE XV. 



Fig. i. H. sinuosus. Surface view of epidermis of young plant to show first 



appearance of cryptostoma ( x 250). 

 Fig. 2. Hydroclathrns cancellatus. Natural size. 

 Fig. 3. ,, Section of thallus ( x 250). 



Fig. 4. Cryptostoma ( x 250). 



