ANNIVERSARY ADDRESS OF THE PRESIDENT. hia 
miles. After adverting to the notice of Trilobites in the work of 
Count Strzelecki, our author mentions the discovery of many others 
by himself, one a Trinucleus, which has been named by Mr. MacLeay 
T. Clarkei. Mr. Clarke considers these older deposits of the Au- 
stralian series, with Mr. Beete Jukes, as representing the Silurian 
and Devonian rocks, including the carboniferous series of England, 
the whole forming one uninterrupted and conformable series of beds. 
In his paper on the Silurian rocks in the valley of the Tweed, Mr. 
Nicol points out that it is only recently that any organic remains 
have been found in this district, or indeed in any of the older 
palzeozoic rocks of Southern Scotland. Dr. Hutton was the first, 
he observes, who discovered these remains. He noticed them in 
his ‘Theory of the Earth,’ as occurring at Wrae near Broughton, 
on the road from Edinburgh to Dumfries. Mr. Nicol, who had 
visited this locality some years since, again examined it last 
autumn, and by diligent search obtained fossils. The only other 
locality where he found any such remains was at Greiston slate 
quarry, near Traquair, whence he procured Graptolites Sedgwickii, 
these occurrmg im profusion, as a mere surface-covering of a 
single bed. In the same bed there are fragments of anthracite and 
elliptical carbonaceous impressions, not unlike the leaves of a plant. 
A seam or vein of anthracite was once known among these rocks 
about a mile distant, affording, Mr. Nicol observes, additional evi- 
dence of the existence of vegetable life at this time. Mr. Salter 
having examined the organic remains obtained by Mr. Nicol, refers 
them to Asaphus tyrannus, another Asaphus, like the young of A. 
megistos (of the American lower Silurian rocks), Phacops Odini 
(Kichwald) or P. alifrons (Salter), and other trilobites, as also to 
Leptena tenwstriata and other shells, Orthis calligramma bemg 
abundant: all, Mr. Salter considers, illustrative of forms and group- 
ing such as are detected in the Llandeilo flags of Wales. Mr. Salter 
adds, that the researches of Lord Selkirk near Kirkeudbright would 
point to the occurrence of upper Silurian rocks also in that part of 
the Lammermuir range, Terebratula semisulcata bemg common 
among the fossils found, as also Leptena lata and others. ? 
Looking at the general evidence, Mr. Nicol considers it best to 
retain, for the present, the old name transition, or merely class them 
as Silurian, without attempting any more precise definition, and re- 
marks as not improbable that the beds whence Lord Selkirk obtained 
his fossils, may be connected with some in Liddesdale, also on the 
extreme south of these deposits, in which he found numerous frag- 
ments of plants. The Wrae limestone, he infers, would thus range 
with the limestone near Girvan, in which Professor Sedgwick dis- 
covered Silurian fossils, and with other limestones in Colmonel parish, 
found by Mr. Carrick Moore to be fossiliferous. 
Though we may regard, with him, any classifications of the rocks 
described by Mr. Nicol, which should extend to minor divisions, as 
premature, the general evidence adduced is important, and of an 
order which may eventually lead, by continued and detailed research, 
without which little can be accomplished in such regions, to sub- 
