ON LIFE-ZONES IN THE BRITISH CARBONIFEROUS ROCKS. 375 
ry 
Note on Nucula gibbosa.—This shell comes in the Calciferous Sand- 
stone beds of Fife, and ranges through the Carboniferous Limestone Series 
of Scotland. Occurs in abundance in the Redesdale ironstone ; is not met 
with, pace the compilers of lists, in the Carboniferous Limestone, but 
occurs in the shales below the Millstone Grits, and in the true Coal 
Measures of North Staffordshire. 
Note on Lowick Fossils —Mr. John Dunn, of Redesdale, has collected 
a very large percentage of the species listed for Lowick in a bed of lime- 
stone at the Combs, Redesdale, which is the four-laws limestone, from its 
relation to the four-laws coal. 
II. Report on Carboniferous Rocks and Fossils ; North Wales District. 
Mr. G. H. Morton reports that he has in preparation a list of the 
fossils found in the carboniferous limestone of North Wales. It contains 
the result of collections made in four separate areas, viz.—Llangollen, 
Flintshire, the Vale of Clwyd, and Anglesey. The list shows the range 
of the species in the subdivisions of the formation in each of the four areas, 
not merely by an asterisk, but by letters indicating the relative frequency 
and rarity of the species. 
The list has been completed, with the excepticn of the part relating to 
Anglesey, but another year will be necessary to finish that area. Collecting 
in Anglesey and along the Menai Strait has already shown that several 
common species, previously considered to be characteristic of the Upper 
and Middle subdivisions of the carboniferous limestone occur there in the 
lower subdivision. It appears that the occurrence of species in definite 
horizons depends more on the lithological character of the strata than on 
the horizon at which they occur. 
As the collecting in Anglesey will be finished early next year, it is 
obviously desirable to postpone the presentation of the list until it can be 
given in its final form. 
III. Report on Carboniferous Rocks and Fossils ; Isle of Man District. 
Mr. Lamplugh writes concerning the Isle of Man :—‘ In the prepara- 
tion of the Survey memoir of that area, several collections of Manx 
carboniferous fossils have been examined by the Palzontologists of the 
Geological Survey, and a substantial list of fossils has heen compiled, 
which it is hoped may be of service in correlating the carboniferous rocks 
of the island with those of the mainland. As a result of this work it is 
found that there are well-marked variations in the fauna of different 
parts of the limestone, as the Rev. J. G. Cumming pointed out fifty years 
ago, but the zonal value of these variations is somewhat doubtful, as the 
changes seem to indicate differences in the physical condition of sedi- 
mentation, rather than the dying out of species, and the evolution of 
others. The collections examined were the labelled portion of the 
Cumming collection of King William’s College, Castletown, Miss Briley’s 
collection, Mr. R. Law’s collection, Dr. Hind’s collection, and the col- 
lections of the Woodwardian Museum and of the Geological Survey.’ 
The Committee hope to make use of these lists, and to refer to them 
more fully in a future report. 
