32 1 Geological Society : — 



the specimens on which the genus was founded. He draws the 

 attention of collectors to the occurrence of Crustaceans of such high 

 rank in Carboniferous rocks. 



4. " On the Premolar Teeth of Diprotodon, and on a New Species 

 of that Genus from Queensland in Australia." By Professor Huxley, 

 F.R.S., Sec.G.S. 



Among a collection of fossil hones from the Darling Down district, 

 in the possession 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 obser- 

 vations on the dentition of the genus, and more particularly upon the 

 characters of the premolars. For the form which he finds distinct 

 from Diprotodon anstralis he proposes the name of D. minor. 



5. " On the Old Red Sandstone of Fifeshire." By James Powrie, 

 Esq., F.G.S. 



Having again examined some sections of the Old Red at White- 

 ness, near Arbroath, and elsewhere, the author is satisfied of a local 

 unconformity of the Upper on the Lower Old Red, 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 Red Series. He proceeded to 

 notice the fossil fishes of Dura Den, of which he says there are six 

 well-marked genera (including Glyptolepis) 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, Esq., F.R.S., F.G.S. 



Some red and purple strata near Catrine, underlying the Permian 

 breccia of Ballochmoyle, were referred to in 1 856 by the author. He 

 has since revisited the locality, and finds that these strata at Balloch- 

 moyle Braes, Catrine, and Sorn represent a coal-field as high as any 

 in the English series — in fact, similar to those at Ardwick near Man- 

 chester, Uffington, Leebotwood near Shrewsbury, "Buxtaby near 

 Nuneaton, and Lane End Potteries. Mr. Binney referred to the 

 observations made by Mr. Ralph Moore, and by Geikie and Mur- 

 chison, 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 Carboniferous strata (not 

 productive of coal) to the above estimate. 



7. "On the Geological Structure of the Southern Grampians." 

 By Professor James Nicol, F.R.S.E., F.G.S. 



The author stated that in 1844, and in subsequent years, he in- 

 dicated that the Silurian strata of the South of Scotland are repre- 

 sented in the North by the metamorphosed or so-called primary 

 strata; and he proceeded to point out that the object of the present 

 communication is to examine the relation which the three great 

 formations Clay-slate, Mica-slate, and Gneiss bear one to the other 



