2T6 Martius on Antediluvian Plants. 
Diameter from 5 to 6 inches. The sulci equal, straight, not 
waved. The faces, when covered with the carbonaceous 
bark, little convex ; when the bark is removed, more con- 
vex, and marked with raised longitudinal lines ; among 
which there is seen in the middle, an orbiculus pitted in 
the centre. 
Found in the quarries at St hnbert. 
% Cactites alveolatus. 
Angulate ? sulcate, with hexagonal tubercles, which are sub- 
ovate, from the upper angles being contracted, and cicatrized 
beneath the tip. 
In this species each of the faces seems to exhibit rows of from 
six to twelve tubercles. 
Lepidodendron alveolatmn^ Sternb. PI. 9. f 1. From the 
quarries at Horsowitz ; Sternb. Occurs also in the coal- 
mines at St Imbert. 
3. Cactites trig onus. 
Angulate ? sulcate, the sulci straight, with subhexagonal tu- 
bercles cicatrized in their upper third part. 
The cicatrices placed at the distance of 5 lines from each 
other. 
Lepidodendron trigonum^ Sternb. PI. 11. f. 1. At Radnitz 
in Bohemia ; Sternb. I have also seen it at St Imbert. 
4. Cactites distans. 
Angulate ? furrowed with straight sulci ; with oblong slight- 
ly convex tubercles, cicatrized above the middle ; the distance 
of the cicatrices exceeding the height of the tubercles by two or 
three times. 
Cicatrices separated more than an inch. The Palmacites ocu-- 
latus of Schlotheim, PI. 17., and, perhaps, Rhode^ PL 2. 
f. 1., seem very like this species, which occur very seldom 
with the bark entire, but frequently in the form of im- 
pressions without the bark. 
From the quarries at St Imbert, as well as those of Swina, 
from which place, an impression of sandy marl was kind- 
ly communicated to me by Coxmi Sternberg. 
