KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:O 5. 5 
the structure of the cuticle, until we have found what is essential or not. As to the 
descriptions, there seems certainly to be a certain difference in the structure of the 
cuticle between the two examined Dicroidium-species; but it will, no doubt, be of se- 
condary importance. Nor does there seem to be any real difference in the construc- 
tion of the stomata, for SEWARD,' who has also microscopically examined D. odonto- 
pteroides from S. Africa, says respecting them: »Stomata not very numerous, occurring 
on both upper and lower epidermis, probably slightly sunk, bordered by two or four 
cells which may be subsidiary cells above the true guard-cells; the pore of the stoma 
is bounded by two crescent-shaped cuticular ridges, which may belong to the guard- 
cells». GOTHAN, it is true, is of another opinion; but he himself remarks, that he has had 
some difficulty in discerning the stomata on account of the badly preserved material. 
The fossils in question were found at Mayils Well near Derby in N. W. Aust- 
ralia embedded in a light-gray clay at a depth of 300 feet. 
Dicroidium Feistmanteli has been described before by FEISTMANTEL and others 
from N. S. Wales, Queensland and South Africa. 
Equisetaceous stem-fragments. 
PI fiost8=9: 
In connection with the above-described fossil there appear impressions of some 
stem-remains. They are about one cm. broad, distincetly grooved and articulate. The 
furrows are fine and do not alternate at the nodes. The distance betwen the nodes 
is unknown, but it is more than six ecms. There are neither sheaths nor leaves. 
Ptilophyllum ? sp. 
BIT for 0: 
Another fossil plant, of which there is only a very fragmentary leaf-impression, 
is probably a Ptilophyllum-species. 
The frond is not very broad and tapers towards the apex. The pinnae, which 
are obliquely fixed on the upper side of the rachis, are relatively broad and short, 
more or less alternate, rather straight, and with a somewhat rounded or at least not 
very acute apex. They stand very close together and are imbricate. The upper mar- 
gin of the pinna-base is somewhat auriculate. The veins cannot be discerned. 
The impression is on a soft, coarse, reddish sandstone and was found at a 
depth of 30 feet at Point Torment, 32 miles from Derby. 
TENISON-WoopDs” has already described a new Australian species, Ptilophyllum 
oligoneurum. This has long, narrow, acute, somewhat falcate, slightly oblique, sepa- 
rate, but very close pinna and, consequently, differs from the fossil now collected. TItis 
very common in the plant formation of Roseword, near Rockhampton in Queensland. 
! Sewarb, A. C. Fossil Floras of Cape Colony. Ann. South African Museum. 1903, p. 54. 
> TENISON-Woops, J. E. On the fossil flora of the coal deposits of Australia. Proc. Linn. Soc. N. S. 
Wales. Vol. 8. Sydney 1884, p. 149, pl. 7, figs. 2—4. 
