KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:o 3. 45 
sides and thus appear to be placed distichously. They are narrow and linear, with 
obtuse apices, and have a length of about 1 cm. Each leaf has a fine but distinct 
median vein. " There were found in other pieces of the plant-bearing rock some de- 
tached leaves, probably belonging to the same species, which were distincetly keeled 
and furrowed. 
It is clearly impossible to determine fragments of this kind. The difficulty of 
a generic determination, even of much better specimens of sterile conifers than the 
present one, has led the writer to propose, in a previous paper (1913), the provisional 
name Hlatocladus. This name should be used for sterile conifers which cannot be 
referred to any better characterized genus, and it may conveniently be adopted in 
this case. In fact, there is no other genus that could be thought of for the present 
specimen, with the possible exception of the genus Taxites. In accordance with the 
opinion expressed in the paper quoted, it may be preferred, however, to restrict the 
use of the latter name to such forms as show a greater resemblance to the recent 
genus T'axus. 
The specimen is from locality c at Rio Fösiles. 
Fragments of dicotyledonous leaves? 
Pl. 5, figs. 21—23. 
The specimens shown in pl. 5, figs. 21 and 23, of which the former is repre- 
sented in enlargement in fig. 22, may possibly be fragments of leaves of dicotyledons. 
The two fragments are evidently different; it is especially the one in figs. 21 and 
22 that suggests a dicotyledon. There is nothing seen of the venation, except the 
midrib, but the dentation of the margin would seem to be more suggestive of a 
dicotyledon than of a fern. 
The fragments are from the upper part of the Rio Fösiles valley. 
Age and correlation of the plant-bearing beds. N 
The plant-remains described above are derived from three different localities, 
b, c and the uppermost part of the Rio Fösiles valley, of which the geology has been 
described above. For a discussion of the age and correlation of the plant-bearing 
beds, it will be necessary to treat the plant-associations of these localities separately. 
The most important of the localities is the one at c, near Rio Fösiles. The 
plants collected here are all from one horizon at the base of the exposed section. 
They consist of the following species: 
Marchantites? sp. 
Nathorstia alata n. sp. 
Gleichenites cf. micromerus (HR.). 
Cladophlebis australis (MORR.) SEW. 
Cladophlebis cf. Brownmiana (DUNK.) SEW. 
