118 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 



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 Boue, figured by Bronn and Romer in ' Lethcea Geognostica,' Theil ii, 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 uniformis. 



The figures of Unio carbonarius, Goldfuss, and Gardinia carbonaria, de 

 Koninck, differ much from that of U. carbonarins, Bronn and Romer, to whose 

 type, however, they both refer their specimens. All three authors also refer their 

 specimens to Tellinites carbonarius, Schlotheim ; but this specimen is said to come 

 from flaring in the Tyrol, a locality where, although coal is present, the beds are, 

 1 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 Gardinia 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 mrifurmis, Goldfuss, and Gardinia Goldfus- 

 siana, de Koninck, are probably of the same species as Bronn and Romer'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. The ironstone contains also fragments 

 of Lepidodendron and other vegetable remains. 



Larger specimens of a shell, PI. 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. 



