1869.] SCUPDER COAL-FORMATION MYRIOPODS. 441
trusive igneous rocks of the north of "Wales; and it certainly appears
to me to be the one which applies to the rocks in question in the
Lake-district. He says:—"Lying, as they invariably do, either
amid the true volcanic rocks or in lower stratigraphical horizons,
and being for the most part felspathic, some of them may well be
the deep-seated masses from whence the lavas and ashes of the
volcanoes came; and I do not see why this should not hold, even
though they may only, in certain instances, have been Cambrian or
Lower Silurian strata that passed into a state of fusion."
Upon the whole, then, and in the meanwhile, I should be decidedly disposed to regard this as the true explanation of the phenomena which I have endeavoured to describe in this communication, and to look upon the igneous masses in question as the roots of the ancient vents from which were derived the alternating ashes and traps which together compose almost the whole of the green slate series. Whether they are to be regarded as being produced by an alteration and fusion of the Skiddaw Slates in situ, is another question, and one which is at present incapable of solution. Phenomena, however, are not wanting which would appear to favour this view; and evidence sufficient for its establishment may yet be obtained, when the district shall have been examined in greater detail.
10. On the Fossil Myriopods of the Coal Formations of Nova Scotia and England). By Samuel H. Scudder, Esq.
(Communicated by Sir Charles Lyell, Bart., F.R.S., F.G.S.)
[Abstract.]
In this paper the author discussed and described the species of Chilognathous Myriopods which have been detected in the Coal-measures. Of these he recognized 6, viz. Xylobius sigillarioe (Daws.), X. similis, sp. n., X. fractus, sp. n., X. Dawsonii, sp. n., X. Woodwardii (sigillarioe, Woodw.), and a species upon which he founded a new genus, Archiulus xyloboides. He regarded these forms as constituting a peculiar family, for which he proposed the name of Archiulidoe.
11. On the Geology of the Country Surrounding the Gulf of Cambay. By Alexander Rogers, Esq., F.G.S., Bombay Civil Service.
The publication of this paper is deferred.)
[Abstract.]
The author described the surface of the country as consisting chiefly of deep alluvial soils, derived from the denudation of the primary and metamorphic rocks surrounding the district, the former
