104 Chronicles of Science. [Jan., 
to the adjoming deposits is not less complete on the side of the 
Infralias than on that of the Keuper. 
Without exception, the deposits of this horizon are conformable 
both to the Trias and the Lias. . 
The geological movements which took place during this period 
began in the Triassic Epoch, and continued without interruption 
into the Liassic. 
There is observable in the fauna a very marked predominance of 
affinities on the side of the Lias. 
The periods of rest from biological manifestations, which oc- 
curred after the deposition of the Keuper, and after that of the zone 
of Aricula contorta, render the latter group the representative of a 
distinct period, and give it the value of a formation. 
Its lower limit is generally well defined, whereas the boundary 
between it and the true Lias is in different countries more or less 
uncertain. 
The Rheetic formation has the greatest paleontological affinity 
with the Lias, and therefore forms the first stage of the Jurassic series. 
The last three numbers of the ‘Geological Magazine’ have, as 
usual, contained some interesting articles. Mr. Henry Woodward 
(the Editor) gives in the September number a description and 
figures of fossil “ Crustacean teeth,” and shows how curiously they 
resemble, until carefully examined, the true teeth of certain Mar- 
supials. Mr. Carruthers has a paper in the next number on a new 
cone from the Coal-measures, which he makes the type of a new 
genus—Flemingites. It is allied to Lepidostrobus, but differs in 
each scale of the cone supporting a double series of roundish spo- 
rangia, whereas in that genus each scale supports only one roundish 
sporangium. The same author has a paper in the November 
number on a Fossil tree-fern from the Upper Greensand. Besides 
containing some observations of interest respecting the determina- 
tion of the fossil, this paper is rendered worthy of notice by the 
author’s conclusion, that the five slight constrictions seen on the 
stem appear to indicate an alternation of climate during the year at 
that remote period, similar to what we now experience. Mr. Baily’s 
paper “On the Cambrian Rocks of the British Islands,” Professor 
Owen’s notice of M. van Beneden’s “ Recherches sur les Squa- 
lodons,” Mr. Kinahan’s notes “On Pre-glacial (?) Drift in Queen’s 
County, Ireland,” and some other articles also contain points of 
interest. The correspondence seems to increase in bulk ‘and value, 
and no doubt forms an attractive portion of the magazine ‘to local 
geologists. 
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 
No less than twenty-three papers are contained in the last 
number of the ‘Quarterly Journal of the Geological Society ;’ we 
