ne of the more typical genera of the Rhaetic plant-bearing deposits of Scania 
0: Ptilozamites, of which Prof. A. G. NATHORST described several species in his works 
on the fossil flora of Sweden. The collection of these plants in the Palaeobotanical 
Department of the State Museum of Natural History at Stockholm having increased 
considerably since Prof. NATHORST's papers were written, a revision of the genus has 
proved desirable. Hence this paper. 
To Professor NATHORST and Dr. T. G. HALLE I desire to express my best 
thanks for the good advice they have been so kind as to give me. 
Genus Ptilozamites NarHorsrt. 
Ptilozamites, NATHORST 1878 a, p. 21. 
Frond pinnate, broadly or narrowly lanceolate to linear. Rachis stout, often 
forked. Pinnae densely placed to imbricate; long and narrow, or short and broad; 
square or rhomboidal, linear or triangular, sometimes falcate; attached to the side 
of the rachis and by the whole of the base; distal margin straight, somewhat concave, 
or «-shaped; proximal margin first parallel then bending forward sharply, or rounded 
from the very base. Veins generally numerous, coming direct from the rachis; bi- 
furcating once or repeatedly; more or less radiating, or sometimes parallel. Con- 
sistence thick and firm. 
The cuticle (pl. 3, figs. 7—9, 11) has been examined in all the Swedish species 
of this genus. It is generally thick, sometimes even very thick, but sometimes it is 
comparatively thin. It is composed of irregular to isodiametrical cells, which on the 
lower side are generally oblong above the veins. On the upper side it is uniform. 
The cells have straight or at times somewhat undulated walls, and in some cases 
indistinet papillae. The cuticle of the rachis differs from that of the segments in 
so far, as the cells in it are always rectangular, very thick-walled, and ranged in 
regular rows. Stomata occur on both sides or only on the lower one. As a rule, 
they are on the lower side only found in the spaces between the veins (pl. 3, fig. 9). 
Their number varies very much, and generally there is a certain relation between 
