BRITISH ASSOCIATION. 
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strata are succeeded by beds of grey shale, white sandstone, and 
dark gray shale, which in this locality forms the uppermost por- 
tion of the series. In the second of these divisions the fossils 
are numerous, including seven species of Cythere and the Modi- 
ola McAdamiy together with remains of fish belonging to the 
genera Gyracanthus, Ptychacanthus, Leptacanthus, and Holop- 
tychius. In the third division, which is about 1400 feet thick, 
fossils occur only in the conglomerate limestone ; they consist of 
several species of Orthis, Spirifer, &c. This deposit differs in 
some respects from the usual appearance of the yellow sandstone 
and carboniferous shales, but from the evidence of the fossils 
Mr. Griffith is induced to refer it to that deposit. The last im- 
portant locality described by the author is the carboniferous 
valley of Ballinamore, in the county of Leitrim, between the old 
slate range of the Cairnclonhugh mountains of Longford and the 
millstone grit district of Slieve-aneerin, in the county of Lei- 
trim. In this valley the slate rocks are succeeded, unconform- 
ably, by sandstone conglomerates, impure arenaceous limestone, 
and dark gray shale with thin beds of sandstone, altogether 
about 70 feet in thickness. These are succeeded by 150 feet of 
yellowish quartoze sandstone, and 100 feet of limestone, dark 
shale, and calcareous sandstone, above which the carboniferous 
slate, lower limestone, calp shale, and upper limestone, occur in 
regular succession up to the millstone grit of the Slieve-aneerin 
mountains. In the lowest calcareous strata of this locality 
were discovered numerous species of Cythere, the Modiola Mc 
Adami, the Oracanthus Milleri, and other ichthyolites, and seve- 
ral plants. The limestone above the shale also contained nume- 
rous plants, and abundance of Orthis crenistria, &c. in its upper 
beds. The carboniferous slate and other beds contained the 
Eernestellse and other fossils in abundance. At Cultra on the 
southern shore of Belfast Lough, are a series of strata formerly 
considered by the author as a part of the new red sandstone, 
and magnesian limestone group, but from an examination of the 
