LIFE-ZONES IN THE BRITISH CARBONIFEROUS ROCKS. 237 
In the upper blue limestone, which is only used for road metal, the 
following were collected :— 
Productus hemisphericus. Lithostrotion aranaea, 
ee semireticulatus. * sp. 
Fenestella sp. 
In the intervening black shales were obtained — 
Leiopteria lunulata. Athyris ambigua. 
Productus margaritaceus. 
At a quarry at Blackrocks, in an oolitic portion of the limestone, is a 
grit bed containing— 
Athyris subtilita (abundant). Lithostrotion aranaea. 
5 ambiqua. 
In some of the very thin black shales are— 
Productus hemisphericus. Athyris ambigua. 
In the limestone beds at Morlais Quarries were found— 
Productus cora (with spines). Euomphalus sp. 
Fe » (without spines). Bellerophon sp. 
Orthotetes crenistria. Lithostrotion sp. 
Spirifer sp. Fragments of Brachiopods. 
The limestone at Graig Fawr, near Cefn, contains in its upper beds— 
Myalina sp. Spirifer sp. 
Athyris ambigua (abundant). Huomphalus sp. 
Orthis sp Macrocheilina acuta. 
Orthotetes crenistria, Bellerophon sp. 
Productus cora (abundant). Archeocidaris Urei (plate). 
3 giganteus (young). Crinoids. 
a longispinus. 
Whilst it would be premature to generalise from what has been done 
in South Wales, the remark may be ventured that in the Coal Measures, 
so far as the subject has been worked, there is to be observed the same 
order of succession of freshwater lamellibranchs which has already been 
found in the North Staffordshire Coalfield ; and mention may also be made 
of the apparent absence in South Wales of that fauna, which is so character- 
istic of the Millstone Grit Series of the Midlands, in rocks which are 
regarded as their equivalents, and which receive the same name. 
Erratic Blocks of the British Isles.—Ninth Report of the Committee, 
consisting of Dr. J. EH. Marr (Chairman), Professor P. F. KENDALL 
(Secretary), Professor T. G. Bonney, Mr. ©. E. De Rance, 
Professor W. J. Sortuas, Mr. R. H. Tippeman, Rev. S. N. 
Harrison, Dr. J. Horne, Mr. F, M. Burron, Mr. J. Lomas, 
Mr. A. R. DwerryuHouse, Mr. J. W. StatHer, Mr. W. T. Tucker, 
and Mr. F. W. Harmer, appointed to investigate the Erratic Blocks 
of the British Isles and to take measures for their preservation. 
(Drawn up by the Secretary.) 
THE most noteworthy records received during the current year are those 
which are furnished by Mr. J. Lomas from Northamptonshire, Leicester- 
shire, and Rutlandshire, the first and last mentioned counties appearing 
