Fossil Mammute of Australia. 
365 
come under their observation ; and for this purpose illustrations of 
tlie osteology and dentition of existing Marsupials are given, more 
especially of species of the families of the Kangaroos ( Macropodida ) 
and Wombats (Phascolomyidce) . 
Of the genns Diprotodon, inclicated, in 1835, by a fragment of lower 
jaw with an incisor of a young individual, fossil evidences since re- 
ceived, and described in this work, have enabled the author to give 
a restoration of the skeleton of the largest species ( D. australis). 
Of the genus Nototherium rauch of the skeleton is restored and three 
species defined — N. MitchelUi, N. Victoria, and N. inerme. 
An extinct genus (Phascolonus ) , of the Wombat fainily, is founded 
on fossils indicative of a species whicli attained the bulk of a Tapir ; 
and evidences of five extinct species of Pliascolomys are adduced 
from fossils more nearly the size of the existing Wombat. In 
addition to larger species of the existing genus Macropus, e.g. Macr. 
Titan , the author adduces characters of the dentition and limbs re- 
ferable to seven extinct genera of the Kangaroo family. 
II. — Note preliminaire sur le terrain Silurien de l’ouest de 
la Bretagne. Par Dr. Ohas. Barrois. (Ann. de la Soc. Geol. 
du Nord, vol. iv. p. 38.) 
I N this paper the author pursues a similar conrse with regard to 
the Silurian, to that which he took a short time since with the 
Devonian deposits of this district. 1 
The stratified deposits in this locality rest on the Gneiss of Brest, 
and are divided by the central granite plateau of Brittany into 
two great masses, a northern and a Southern, each of which is again 
subdivided into eastern and western basins, and it is the Silurian 
beds in the Western basin of the Southern mass — the Finisterre basin 
— that are here treated of. They consist of a series of schists, 
sandstones and quartzites, and may be tabulated as follows, com- 
mencing with the Gneiss de Brest, then follow in ascending Order : — 
Mica-schists ; Pliyllades vertes de Douamenez ; Poudingues et Schistes 
rouge lie-de-vin du Cap la Chevre ; Gres blancs des Montagnes 
Noires ä Scolitus linearis ; Schistes de Morgat a Calymene Tristani, 
the most fossiliferous division of the group ; Schistes et Quartzites 
de Plougastel. The last named have been classed by some pi-evious 
observers as Devonian ; but are considered by M. Barrois to be of 
Silurian age, and the equivalents of the '• Gres blancs sans fossiles ” 
of Dalimier in the Rennes and Cotentin basins. 
M. Barrois maintains that these Silurian beds of the Finisterre 
basin exhibit precisely the same divisions as in the better studied 
regions of the province ; the modern ideas of their true stratigraphy 
being founded on misconceptions as to the real age of the schists 
and quartzites of Plougastel, whilst a large fault running down the 
valley of the river Elorn and the estuary of Brest has been entirely 
overlooked. — B. B. W. 
1 Ann. de la Soc. Geol. du Nord, vol. iv. p. 59; Geol. Mag. June, 1877, p. 280. 
