172 



ME. H. HAMSHAW THOMAS AND MISS N. EANCROET ON 



Fig. 21. 



Fig. 22, 



Zamia LindenL — Lower cuticle^ in surface view. The 

 tliickened stoma-opening shows a double series of 

 lateral subsidiary cells at each side (J, I). X 450. 

 (This cuticle was not remoyed by maceration, aud 

 thus shows the thickening substance of the guard- 

 cells and air-space, showing through to the surface.) 



Z. murieaia. — Lower cuticle in surface view. 



The stoma-opening in this case has five 

 subsidiary cells (j> and I) surrounding it. 



X 450. (Not macerated ; see text-fig. 21.) 



Fig. 23. 



Z. Skinneri. — Upper cuticle in section, showing the variation in the 



thickness of the cell-walls. (Cf. text-fig. 20.) x 450. 



In Z. integrlfolia hair-scars are occasionally seen, particularly on the under surface 



the nerve-courses. The scars seem to occur 

 They occur also in Z Ottonis and Z. Skinnei 



over a 



up 



of 



walled cells 



Tlie culin layer is similar in thickness to that of Macrozamia [cf. PL 18. figs. 13 & 14) 



BowENiA, HooTc. PI. 17. figs. 7-9; text-figs. 24-26. 



References :—Nestler (1895), pp. 356, 357 ; Taf. 13. figs. 19-23. Porsch (1905), p. 13 ; Ta£. 1. 



figs. 1-4. 

 Species examined : — Bowenia spectabilis. Hook., var. serrulata, Andre (^=Bowenia serrulata (Andre), 



Chamberlain (1912, p. 419)). 



Bowenia serrtdata agrees with such Zamias as Z. Fischeri in the arrangement of the 



I 



three- or four-angular epidermal cells and also in the thickness of their walls {cf. text- 



■o 



19 & 25). The cells 



elongated, with straight walls, and are slightly 



