522 Geological Society: Anniversary Address, 1843. 
much information respecting the overlying strata, among which 
some new features of the Keuper formation are sketched with the 
author’s usual fidelity. 
From the researches of Captain Portlock I turn to those of 
Mr. Griffith, who spent many years in preparing the Geological 
Map of Ireland, and for which he has deservedly received much 
praise. In a very elaborate comparative table of the fossils of the 
mountain limestone series of Ireland, presented to the Manchester 
Meeting of the British Association, Mr. Griffith divides that series 
into five subformations, which in ascending order are the Yellow 
Sandstone, Carboniferous Slates, Lower Limestone, Calp, and Upper 
Limestone. He also shows that the two lower of these subdivisions 
must, from their fossils, many of which ascend into the overlying 
strata, be classed with the mountain limestone series, and not with 
the Devonian rocks; in which case, I would observe, that they must 
also be classed with the sandstone, limestones and shale of Berwick- 
shire, to which allusion has already been made, I am the more in- 
duced to believe in the accuracy of this comparison, because Count 
Keyserling and myself have this year confirmed the observation of 
Professor Sedgwick, made in 1828*, viz. that Posidoniz, similar to 
those in the culm limestones of North Devon, exist in the middle 
of the mountain limestone series of Northumberland. As Mr. 
Griffith has shown that the Irish Calp, which also occupies the middle 
place in the limestone of Ireland, contains the same peculiar fossils, 
the parallel may now be considered as very well established, between 
this central mass of the mountain limestone in these distant localities, 
Drawn up as this table has been under the directions of Mr, 
Griffith, by a diligent young naturalist of good promise, Mr, F, 
M‘Coy, there can be no doubt that it is entitled to much con- 
sideration, and that its publication will be very useful. In refer- 
ence to the comparison instituted by Mr. Griffith between the 
strata of North and South Devon and those of Ireland, I ma 
observe that it is of infinite importance to the establishment of a 
true series of equivalents, that large adjacent tracts of country 
should be surveyed, and their fossils compared by the same obser- 
vers, for the want of which identical species may sometimes obtain 
different specific names; thus considerably interfering with a nice 
discrimination of the groups. 
Paleozoic Fossils.—Before I quit the subject of the older British 
rocks, it is my duty specially to call your notice to a memoir just 
published in your Transactions, because, although inserted by order 
of the Council, and throwing great light on British palzeozoic remains, 
it has not yet been sufficiently alluded to from this Chair. It is the 
work of MM. de Verneuil, and D’Archiac on the Fauna of the 
Palaeozoic Rocks. In the first instance this memoir was designed to 
consist simply of a description, by M. E. de Verneuil, of the organie 
remains of the Rhenish provinces explored by Professor Sedgwick 
and myself, and of which you have now our published views. M. 
De Verneuil, who combines the attainments of a good conchologist 
* See Professor Sedgwick and Mr. Murchison, Geol. Trans. vol. iii. p. 693, 
