14 ERNST ANTEVS, THE SWEDISH SPECIES OF PTILOZAMITES NATH. 
also presents a considerable resemblance to Piilozamites Zuberi (SzAJN.) NATH. (SzAJ- 
NOCHA 1888, p. 15; pl. 2, fig. 1; NATHORST 1889, p. 204) from Argentina. 
Pt. Heeri is only known from the Rhaetic of Scania. The greater part of the 
fine collection comes from the plant-bearing layer 3 at Bjuf. In solitary specimens 
Pt. Heeri occurs in strata 1, 2, and 4 in the same locality. One fragment (in the 
Geol. Museum at Lund) was found in the lower seam at Höganäs. (Bjut 1—3, and 
the lower seam at Höganäs, zone with Camptopteris spiralis. Bjuf 4, zone with 
Lepidopteris Ottonis.) 
Ptilozamites Carlssoni Narr. 
PIP2. fps. ADA pII3 FS 
Ptilozamites Carlssomi, NATHoRST 1878, p. 11. 
» Oldhanvi, NATHORST 1878, p. 11. 
> Carlssomi, NATHORST 1879, p. 61; pl. 11, figs: 12, 13, 13a; pl. 12, fig.:8; pli13, fig. 18. 
> > NaATHORST 1880, p. 66. 
> » NaATHoRST 1886, p. 122. 
Frond pinnate, comparatively long and narrow, reaching a breadth of 11 mm. 
Rachis broad, undivided. Pinnae imbricate, short and broad, rhomboidal, attached 
by the whole of the base; distal margin straight or somewhat concave; proximal 
margin at first parallel with the distal one, then bent in a sharp angle, or at times 
rounded from the very base. Apex blunt to rounded. Veins not very numerous, 
coming direct from the rachis, parallel, simple or forked. Consistence firm. 
The cuticle is on the upper side (pl. 3, fig. 11) uniform, very thick, and com- 
posed of isodiametrical cells, which at times have papillae. There are stomata, but 
they are rather rare. The lower cuticle is considerably thinner, and has more 
numerous stomata than the upper one. Often it is further somewhat differentiated, 
the stomata only occurring between the veins. The rachis is composed of rectan- 
gular cells. As in other species of this genus some segments have holes (pl. 3, fig. 
11) such as I have described on page 4. 
The most characteristic feature of Pt. Carlssoni is the imbricate position of the 
pinnae (pl. 2, figs. 4, 5). These are short and broad, rhombic or almost square, and 
are attached by the whole of the base. The veins are rather few, parallel, simple 
or forked, and as a rule not very distinct. 
Pt. Carlssonii is very closely related to Ptilozamites Heeri. The only real 
difference is that the pinnae are not attached in the same way, being imbricate in 
Pt. Carlssomi. "The latter only comprises small fronds, and as a rule is considerably 
smaller than Pt. Heeri. This being, however, also represented by small speci- 
mens, there is no real difference regarding this point. As at times there may be some 
difficulty in deciding whether the pinnae are imbricate or not, one could possibly 
unite the two species. It may, however, be as well to keep them separate, at least 
for the present, for the typical specimens are well distinguished from each other, 
