L. Wills — Plant Cuticles, Coal-measures. 



387 



Cyclopteris ep. 



Locality: Preesgwyn. Horizon: Middle Coal-measures. 



Specimens examined show two ty|)es of epidermal structure similar 

 to those described for Neuropteris heterophylla. 



The form and venation of the leaflet is shown in Text-fig. 2. In 

 several specimens both surfaces of the leaf were preserved and were 

 separated ; PL XXXI, Figs. 6, 7, represent the two surfaces of one 

 fragment. The form and arrangement of the cells and stomata are 

 illustrated on PI. XXXI, Figs. 6, 7, and Text-fig. 3. Their close 

 similarity to type a of Keiiropteris heterophylla can be clearly seen by 

 comparing these figures -with PI. XXX, Figs. 2, 5, and Text-fig. 1. 



Stomata and Guard-cells. 



Fig. 1. 



2J, ring of thickening; 



Neuropteris heterophylla. 

 G, guard-cells. 

 ,, 2. Half of a Cyclopteris leaflet. 



,, 3. Cyclopteris s"^. i?, ring of thickening ; G, guard-cells. 

 ,, 4. Cordaites sp. 

 ,, 5. Cordaites sp. 



Water-stomata similar to those already described form a continuous 

 band round the edge of that leaf surface which carries the numerous 

 stomata. 



Type /3. The specimens classed under this heading are similar to 

 those of type a in form, but are frequently not lobed. The one 

 surface is slightly hairy and imperfectly preserved ; the other shows 

 cells of a normal structure and a few scattered stomata, Water- 

 stomatu have not been observed. 



