Dr Martius on Antediluvian Plants^ ' ^TT 
A species much allied to this, but differing, in having its 
parts of a larger size, has been figured by Nau., pi, 4., from an 
impression only. 
5. Cactites longesulcatus. 
Round ?, with several straightish subequal sulci, marked with 
a linear cicatrix at the distance of nearly an inch ; the faces 
somewhat convex. 
In the quarries at St Imhert. 
I have seen specimens of this two feet long by half a*foot 
broad, but all excoriated, marked with numerous furrows, 
running down at the distance of from 4 to 6 lines. 
6. Cactites subundulatus. 
Round with several subundulate sulci, marked at the dis- 
tance of half an inch with a linear cicatrix ; the faces convex. 
Occurs with the former, from which it differs in having the 
sulci narrower, with more elevated faces, and approximate 
cicatrices. 
7. Cactites iesselgius* 
Plane with’ contiguous rhombiform areolae, marked in the 
middle with the linear cicatrix. 
This seems to belong to the Opuntiae. I have only seen a 
single impression. It is found at St Imhert. 
A genus of plants described by Count Sternherg^ under the: 
name of Syrlngodendron^ agrees in many of its characters with 
the Cactites, nor can it be doubted that it belongs to the succu- 
lent or flcoid vegetables ; but as the impressions situated in the 
middle of the fistulas, and commonly remarkable for having the 
form of a bifid nail, can scarcely be formed by the tubercles of 
Cacti, it is probable that they belong to some cereiform species of 
Euphorbia, whose twin spines unite at the base, but diverge 
above. To those Euphorhltes^) which I imagine to belong to 
this division, we may ascribe the following character. 
A straight woody stalk or simple or branched, impress* 
ed with rectilinear furrows, with the faces marked in the middle 
with oblong, emarginate, or often bifurcate cicatrices, longitudk 
nally disposed. 
VOL. XII. NO. 24. APRIL 1825. 
T 
