56 
Palaeontologie. 
Strands unite as they pass through the phelloderm. The structure 
of the trace is almost identical with the double foliar bündle of the 
leaf described by Scott as Sigillariopsis sulcata , which is thus simply 
the leaf of a Eusigillarian stem. 
The parichnos increases greatly in size, as we pass from the 
exterior of the stem to the inner margin of the periderm. The two 
Strands further unite, first below and then above the trace, so that, 
at a deep level in the periderm, the trace is completely surrounded 
by a broad zone of this tissue. 
The Eusigillariae are compared anatomically with the Subsigil- 
lariae , and it is found that there are four points in which they dif- 
fer. In the Eusigillariae , the stems are ribbed and the primary 
xylem always forms a continuous ring. The leaf-traces are monoxy- 
lic throughout their course. In the periderm, the xylem of the trace 
divides into two distinct Stands, and these persist through the leaf- 
base, into the leaf, until near its apex, as the xylem of the foliar 
bündle. If, however, we regard Sigillariopsis Decaisnei , Ren., as a 
member of the Subsigillariae , a conclusion which seems inevitable, 
then this latter characteristic is common to both groups, though in 
the Subsigillariae it is combined with the diploxylic structure. 
The Eusigillariae are next compared with the various types of 
structure exhibited b}^ Lepidodendron and Lepidophloios , wfith the 
conclusion that they correspond most closety to the Lepidendroid 
trunks of Arran and Dalmeny. Anatomically they appear to be 
remote from Bothrodendron , so far as the structure of that genus 
is known. Arber. 
Barsch, O., Die Pseudo-Kannel-Kohle. (Inaugural-Diss. Berlin 
1908. 33 pp. u. 2 Taf. 3 Textfig. — Dasselbe in Jahrb. kgl. Pr. 
geol. Landesanst. für 1908. I. 29. 3. Berlin 1908.) 
Verf. hat die von Muck als Pseudo-Kannel-Kohle bezeichnete 
Kohlenart nach Behandlung mit Mazerationsmitteln (rauchende Sal¬ 
petersäure, Schulze’sches Reagens und Chromsäure) mikroskopisch 
uniersucht und zum Vergleich damit ebensolche Untersuchungen 
an Glanzkohle (gewöhnliche Steinkohle), Streifenkohle und Mattkohle 
vorgenommen. Die Mattkohlenstreifen der Streifenkohle erkannte er 
als Kannelkohle, die Pseudo-Kannel-Kohle (unter dem untersuchten 
Material befand sich auch von Muck selbst als typisch bezeichnete) 
ist eine Kohle, die nicht nur nach ihren chemischen Eigenschaften, 
sondern auch nach ihrer Genesis zwischen Glanz- und Mattkohle 
steht. Die Zusammensetzung ist im allgemeinen die der Streifen¬ 
kohle, ihr homogenes Aussehen rührt von der innigeren Mischung 
beider Kohlenarten her. Als recente Analoga sind die Sapropeltorfe 
bezw. Doppleritsapropele anzusehen. Die Tafeln demonstrieren die 
verschiedene Reaktion der einzelnen Kohlenarten auf die Mazera¬ 
tionsmittel. Gothan. 
Bather, F. A., Nathorst’s Methods of studying Cutinized 
Portions of Fossil Plants. (Geol. Mag. Dec. 5. 1908. Vol. V. 
N°. X. p. 454—459.) 
A full summary of Professor Nathorst’s paper “Paläobotanische 
Mitteilungen” N°. 3—6 (K. Svenska Vet.-Akad. Handl. Vol. XLIIL 
1908) in which the method of studying carbonized leaves and other 
cutinized plant remains, by means of bleaching them with Chlorate 
of Potash and Nitric acid, or by the use of Eau de Javelle is de- 
