PLATE VII. 
Fig. 1.—Carbonicola Polmontensis. The cast of a full-grown example from Omoa, U. C. M. 
Scotland. Collection of Mr. James Nielson. (Page 58.) 
Fig. 2.—Carbonicola Polmontensis. Cast showing the pallial line and the adductor muscle scars, 
from Kirkwood, U. C. M., Scotland. Same Collection. (Page 58.) 
Fig. 3.—Carbonicola Polmontensis. A cast from Springhill Colliery, Kilmarnock. Collection of 
Mr. Beveridge. (Page 58.) 
Fig. 3 a.—The same specimen viewed from above. (Page 58.) 
Fig. 4.—Carbonicola Polmontensis. A cast from the Ell coal, Kilmarnock. Collection of 
Mr. Smith. (Page 58.) 
Fig. 5.—Carbonicola subconstricta. The original of the figure in Sowerby’s ‘ Min. Conch.,’ vol. i, 
pl. xxxiii, fig. 1. In the Sowerby Collection, Nat. Hist. Mus., South Kensington. (Page 59.) 
Fig. 6.—Carbonicola subconstricta. The original of the figure in Sowerby’s ‘ Min. Conch.,’ vol. i, 
pl. xxxiii, fig. 2. In the same Collection. (Page 59.) 
Fig. 7.—Carbonicola subconstricta. The original of the figure in Sowerby’s ‘ Min. Conch.,’ vol. i, 
pl. xxxiii, fig. 83. In the same Collection. (Page 59.) 
Figs. 8—10.—Carbonicola subconstricta. A series from Lowmoor, Bradford, Yorkshire, in the 
Collection of the Woodwardian Museum, Cambridge. (Page 59.) 
Figs. 11 and 15.—Carbonicola subconstricta. Casts of large forms, showing pallial line and 
adductor sears from above the thin bed, Burnley. Collection of Mr. George Wild. (Page 59.) 
Figs. 12 and 14.—Carbonicola subconstricta. A series from Lowmoor, Bradford, Yorkshire. 
My Collection. (Page 59.) 
Fig. 14a.—A view of fig. 14 seen from above. (Page 59.) 
Fig. 16.—Ouarbonicola obtusa. From the Lower Coal-measures of North Staffordshire, Whitfield 
Colliery. The shale has been worked away from these valves since the drawing was made, and the 
hinge-plates are to be seen on Pl. XI, fig. 1. My Collection. (Page 61.) 
Figs. 17 and 18.—Carbonicola obtusa. Full-sized examples from the Cockshead Rock, Hulme 
Colliery, Adderley Green. (Page 61.) 
Fig. 18 a.—Fig. 18 seen from above. My Collection. (Page 61.) 
Fig. 19.—Carbonicola obtusa. A specimen from the M. C. M. of Ashton-under-Lyme, in the 
Collection of the Woodwardian Museum, Cambridge. (Page 61.) 
Fig. 19 «.—Carbonicola obtusa. The same specimen, viewed from above, showing ? eroded 
umbones and the wide and excavated lunule. (Page 61.) 
Figs. 20—23.—Carbonicola obtusa. A series of young forms from a disused pit on the same 
horizon as the Hulme Colliery, Dividy Lane. My Collection. (Page 61.) 
Figs. 24—29.—Oarbonicola nucularis. A series from the roof of the Hard Mine Coal of Adderley 
Green and Bucknall, showing variations in shape; all casts. My Collection. (Page 63.) 
Figs. 26a and 29 a.—Two of the specimens showing the casts of the umbones and hinge-line. 
(Page 63.) 
Figs. 80 and 31.—Carbonicola nucularis. Two testiferous specimens from beds of the same 
horizon, Talk-o’-th’-Hill. My Collection. (Page 63.) 
Figs. 832—42.—Carbonicola nucularis. A further series from the roof of the Hard Mine Coal, 
North Staffordshire. My Collection. (Page 68.) The number 39 on the left-hand side should be 36. 
