270 Prof. T. Rupert Jones—Ostracoda from Nova Scotia. 
favourable for the formation of Coal-shales,’ especially in the Lower 
Carboniferous series of Scotland. C. bairdioides occurs more rarely, 
but in strata similar to the above, in Scotland and Staffordshire. 
They both occur at the Joggins, on the shore of the Cumberland 
Basin, Cumberland Co., Nova Scotia, as noticed above. 
The geological features of Inverness County (Cape Breton), Nova 
Scotia, and the relationships of the strata are described in detail in 
the Geological and Natural-History Survey of Canada: Report of 
Progress, 1885 ; and Reports and Maps of Investigations and Sur- 
veys, 1882-83-84 ; including Report (H) on the Geology of Northern 
Cape-Breton, by Hugh Fletcher, 1884. 
Fies. 1-4. Carbonia fabulina, J. & K. Var. altelis, nov. 
Fig. 1. Carapace, showing the left valve, overlapped by the other valve at the 
margin. x 26. 
Fic. 2. Inside of the right valve. x 26. 
Fic. 3. Dorsal view of the carapace. Not set quite upright, but sloping a little. 
x 26. 
Fic. 4. Punctation of the surface; highly magnified. 
The Inverness Coal-field is treated of at p. 53H; and the Mabou 
Coal-basin at p. 61H. This is referred to as belonging to the 
«Lower Carboniferous” series at p. 53 H and on the Map (No. 14, 
1884), accompanying Mr. Fletcher’s Report. At p.6 of the Report H, 
however, it is referred to the “‘ Middle Carboniferous,”’ which consists 
of ‘Conglomerate and Coal-measures”’ in that locality. 
The strata containing the specimens under notice are indicated in 
Mr. Fletcher’s Map (No. 14) as at the place where Mr. Foord 
collected fossils in 1881, on the shore about one mile and a half 
south of Cape Mabou,’ and about one mile north of the spot marked 
“Mabou Coal-mines ” on the same map. 
The “ Black Shales” of the Mabou Coal-measures are mentioned 
in the list of strata at p. 70 H, thus— 
«©12. Dark-bluish-grey, thin-bedded, calcareo-bituminous shale ; 
1 See Quart. Journ. Geol. Soc. vol. xxxv. 1879, pp. 30 and 38; and Grou. Mae. 
Dee. III. Vol. I. 1884, p. 360. 
2 The post-town called “Cape Mabou’’ is three miles east (inland) of Cape 
Mabou. 
