118 CARBONICOLA, ANTHRACOMYA, AND NATADITES. 
proposed the name Goldfussiana in its place; Sowerby’s original Unio uniformis 
being an Oolite shell from Felmersham, Bedfordshire, and Goldfuss’s Unio 
uniformis being totally different in shape, size, and occurring in the Carboniferous 
beds of the neighbourhood of Kusel. Unio carbonarius, the Mytulites carbonarius 
of Boué, figured by Bronn and Romer in ‘ Lethea Geognostica,’ Theil 1, p. 416, 
certainly belongs to the genus Anthracomya, and I believe will be found to be the 
same species as that figured by Goldfuss as Unio wniformis. 
The figures of Unio carbonarius, Goldfuss, and Cardinia carbonaria, de 
Koninck, differ much from that of U. carbonarius, Bronn and Rémer, to whose 
type, however, they both refer their specimens. All three authorsalso refer their 
specimens to Tellinites carbonarius, Schlotheim ; but this specimen is said to come 
from Hiring in the Tyrol, a locality where, although coal is present, the beds are, 
I am told by Professor Geinitz, of Tertiary age. Neither Goldfuss nor de Koninck 
says anything about their shell having an expanded end or oblique swelling (both 
present in Bronn’s form), so that it must be concluded that the Unio carbonarius, 
Goldfuss, and Cardinia carbonaria, de Koninck, differ from Unio carbonarius, Bronn, 
and that the specific name carbonarius, having been applied by Schlotheim to a 
Tertiary shell, must be dropped. Unio uniformis, Goldfuss, and Cardinia Goldfus- 
siana, de Koninck, are probably of the same species as Bronn and Rémer’s U. car- 
bonarius. Anthracomya minima is much more oblique and less transverse than 
Anthracomya Goldfussiana, and has the oblique ridge and sulcus more developed, 
and the posterior end more expanded. It may be noted that the German shell is 
very thin, and unless well cleared from the matrix the thin expanded upper 
part of the posterior end may not be exposed, and the specimen will have the 
external appearance of a Carbonicola, for which, I have noted, it has been often 
mistaken. The lines of growth, though, are distinctly characteristic of 
Anthracomya rather than of Carbonicola. 
It is difficult to obtain specimens of A. minima free from the matrix, but by 
calcination Mr. C. Roeder has managed to procure some fairly perfect examples, 
though of course much shrunken in size. he ironstone contains also fragments 
of Lepidodendron and other vegetable remains. 
Larger specimens of a shell, Pl. XVI, figs. 21 and 22, are in the collection of 
the Geological Survey of Scotland, from near Dunse, which only differ from the 
English examples in size, and which I have therefore referred to this species. 
