302 PROCEEDINGS OF THE GEOLOGICAL society. [Apr. 19, 
the Caradoc sandstone in this line is thrown suddenly forward by a 
fault, which is believed at present to have a perpendicular downthrow 
to the north of about 4000 feet. 
In conclusion, the authors stated that almost the whole of the 
traps in group B were regularly bedded, and contemporaneous with 
the rocks in which they lie; that scarcely a single instance of a “‘dyke” 
had been anywhere observed ; and that whatever may have been the 
exact mode of formation of the rock called « ash,”’ its lithological 
characters show it to have been derived from igneous materials, its 
bedding and interstratification with slates show it to have been de- 
posited by water, while its gradually dymg out (the beds becoming 
fewer and thinner) above and below the traps show that its exhibi- 
tion was intimately connected with the commencement and ending 
of the igneous action which produced them. 
Apri 19, 1848. 
Sir John Lubbock, Bart. was elected a Fellow of the Society. 
The followmg communications were then read :— 
1. Palichthyologic Notes, supplemental to the Works of Prof. 
Acassiz. By Sir Poitip Grey Ecerron, Bart., M.P., F.R.S. &. 
I wAve been frequently and painfully reminded (since the departure 
of Agassiz for America), by numerous applications from scientific 
friends for information on the subject of Fossil Ichthyology, that this 
branch of Paleontology has not kept pace with the progress that has 
been made in the collateral departments of the science. In fact, since 
the publication of the Monograph of the Fishes of the Old Red Sand- 
stone, it has been all but stationary. It is much to be regretted that 
a study so interesting in itself and valuable to the geologist should 
i so much neglected. The eminent success which rewarded the 
labours of Professor Agassiz, and the fertility of the ground, ought 
to have enticed many labourers into the vineyard. Such however 
has not been the case, and the fruit has accumulated in useless pro- 
fusion, which might have been made available for the general benefit ~ 
of the geological community. The extent of these unproductive 
materials will be partly appreciated on reference to the general table 
of fossil fishes issued with the last livraison of Agassiz’. great work. 
The species therein recorded with asterisks prefixed have been neither 
figured nor described. Deducting the fishes of the Old Red Sandstone, 
which have been subsequently described in the Monograph, there 
still remain 389 species under this category. To this list must be 
added a considerable number known to Agassiz but not yet named, 
many others which have not come under his cognizance, and all the 
discoveries since 1844. The period of the learned professor’s return 
is stated to be distant ; if therefore some effort be not speedily made 
to render these accumulated materials in some sort available, the 
stock on hand will soon be too gigantic even for Agassiz to undertake 
with any hopes of regaining the lost ground and making head with 
