198 “ REPORT—1883. 
i 
i 
LES APEO 
SLO B Zz \ \ r 
Sz =S Ae =) —s Ps 
ju : : : 
3 
Fig. 2.—Ptilodictya Lonsdalei, Vine. 
1. Longitudinal section, transparent. 2. Transverse section, transparent. 
3. Longitudinal section, opaque. 
4, Two cells with their adjacent bars, from a charred specimen, opaque. 
The letters are the same in all the figures. a. The true cells. 6. The vestibule of 
the cell. c. Intervening bars. d. Imaginary axis. 
(Drawn by aid of camera lucida, magnified about 40 diameters.” 
