310 
THE GEOLOGIST. 
4. " On the Premolar Teeth of Diprotodon, and on a New Species of 
that Genus from Queensland in Australia." By Professor Huxley. 
Among a collection of fossil bones from the Darling Down district, in 
the po ^session of Dr. Cotton, F.G.S., the author has observed a portion of 
the right ramus of the lower jaw of Diprotodon, and parts of the right and 
left upper jaws, with the anterior grinders in place, of distinct individuals. 
Hence he was enabled to offer some observations on the dentition of the 
genus, and more particularly upon the characters of the premolars. For 
the form which he finds distinct from Diprotodon australis he proposes 
the name of D. minor. 
5. " On the Old Eed Sandstone of Fifeshire." By James Powrie, F.G.S. 
Having again examined some sections of the Old Red at Whiteness, near 
Arbroath, and elsewhere, the author is satisfied of a local unconformity of 
the Upper on the Lower Old Eed, but that no other locality in Forfarshire 
exhibits this want of conformity ; and neither in Fifeshire nor Perthshire 
does the author find a section distinct enough to exhibit such a break in 
the series. Mr. Powrie alluded to the yellow sandstone of Dura Den, and 
observed that though it is unconformable to the red sandstone beneath, yet 
he believes that it belongs to the Old Eed Series. He proceeded to notice 
the fossil fishes of Dura Den, of which he says there are six well-marked 
genera (includmg Glyptohpis) with about seven or eight species. 
6. " On some Upper Coal-measures, containing a bed of Limestone, at 
Catrine, in Ayrshire." By E. W, Binney, F.E.S. 
Some red and purple strata near Catrine, underlying the Permian 
breccia of Ballochmoyle, were referred to in 1856 by the author. He has 
since revisited the locality, and finds that these strata at Ballochmoyle 
Braes, Catrine, and Sorn represent a coal-field as high as any in the 
English series ; in fact, similar to those at Ardwick near Manchester, 
Ufiington, Leebotwood near Shrewsbury, Buxtaby near Nuneaton, and 
Lane End Potteries. Mr. Binney referred to the observations made by 
Mr. Ealpli Moore, and by G-eikie and Murchison, and pointed out how far 
he differs from them. Mr. Moore gives 565 fathoms for the whole series 
in Ayrshire ; the author finds reason to add nearly 300 fathoms of Car- 
boniferous strata (not productive of coal) to the above estimate. 
7. " On the Geological Structure of the Southern Grampians." By 
Professor James Nicol. 
The author stated that in 1844, and in subsequent years, he indicated 
that the Silurian strata of the South of Scotland are represented in the 
North by the metamorphosed or so-called primary strata; and he pro- 
ceeded to j)oint out that the object of the present communication is to ex- 
amine the relation which the three great formations, Clay-slate, Mica-slate, 
and Gneiss bear one to the other as regular constituents of the crust of the 
earth, and especially in certain parts of the Scottish Highlands, as illus- 
trated by sections observed by himself. These he correlated with what is 
seen in other parts of the Highlands. 
Contrasting his published sections with the corresponding ones given by 
Sir E. I. Murchison and Mr. Geikie, he observes that, though represented 
as maintaining the identity of the gneiss of the west coast with certain 
mica- or chlorite-slates, yet he has in former papers, and in his published 
map, always regarded them as being identical only so far as both belong 
to the great series of metamorphic formations inferior to the red sandstone 
and quartzite, but still as distinct formations with peculiar features, and, 
it may be, of widely difierent age. 
8. "On some Natural Casts of Foot-prints from the Wealden of the 
Isle of Wight, and of Swanage." By S. H. Beckles, F.E.S. 
