KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:O0O 3. 41 
The shape is seen in figs. 16—18, pl. 3, which show the scales in surface view — 
whether from above or below it is impossible to decide. In pl. 3, fig. 15, are shown 
some scales which, according to their position in the rock, are seen edgewise. The 
plane of the scales is probably not quite vertical to that of the rock but somewhat 
oblique: they permit of forming a fairly good idea of their structure, however. The 
scales appear to be thickest a little below the apex, showing there a marked expan- 
sion of the adaxial surface. The abaxial surface, on the other hand, has its greatest 
expansion, which is not quite so marked, a little nearer the base, the scale thus be- 
coming distinctly asymmetric as seen in radial section. The sharp acumen into which 
the thick apical portion of the scale is prolonged, is somewhat curved. TItis a little 
longer than the pointed projection seen in surface view, and it is probable that the 
uppermost portion of the broad spatulate part is rather thin so as to contribute, as 
seen in profile, to the formation of the acumen. 
The male strobilus of this species is not known with certainty, but it is pos- 
sible that it is represented in the specimen shown in pl. 3, fig. 19. This speci- 
men shows the characters of the species in regard to the vegetative shoot, and it 
is possible, or even probable, that the upper, thick portion of the short branch is 
of reproductive nature, representing a male strobilus. Of the structure of the latter, 
however, nothing can be seen. A similar fragment is shown in fig. 20. A specimen 
of what appears to be a somewhat better preserved male strobilus, shown in pl. 3, 
fig. 21, will be described below. Though it is very probable, there is no direct evid- 
ence, however, that it belongs to this species. 
The sterile shoots of this species belong to a type which, though not very com- 
mon, recurs in different genera and families of living conifers and also in many 
Mesozoic forms. For the latter, in the absence of cones, the generic name Brachy- 
phyllum should be preferred, since that genus is not founded on characters from the 
fructification. In the present case, the determination is not merely dependent on the 
vegetative characters, however, as the cones here described almost certainly belong 
to the same species. Among Mesozoic forms with cones of to any extent known 
structure there is only one with which the present species can be closely compared, 
viz., the plant usually referred to as Echinostrobus Sternbergii SCHIMPER. The genus 
Echinostrobus was instituted by SCHIMPER (1870—72, p. 330) for forms which had 
previously been described by UNGER (1849, p. 345) under the name of Arthrotaxites 
and which were believed by the latter author to be closely allied to the recent genus 
Arthrotaxis Don. The most important of UNGER'S specimens was one which carried 
three cones, this being, as far as I know, the only fiertile specimen of its kind to 
the present date. It was on this specimen that UNGER (1849, p. 345; pl. 5, fig. 1) 
instituted the genus Arthrotaxites, naming the species A. lycopodioides, but later on 
he described under the same generic name another species (ÅA. princeps) founded on 
sterile specimens of a somewhat similar habit. SCcHIMPER (l. c.) refers both the fertile 
specimen (ÅArlthrotaxites lycopodioides UNG.) and the sterile ones (Arthrotaxites princeps 
UNG.) to one species and includes in it also several forms of sterile coniferous branches 
previously described under the name Caulerpites. "This species he makes the type 
E. Sv. Vet. Akad. Handl. Band 51. N:o 3. 6 
