16 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 
1. Unio abbreviatus, Goldf. 
2. ,, utratus, Goldf. 
3. ,, tellinarius, Goldf. 
4.  ,, subconstrictus, Sow. 
From Liége. 
» uniformis, Sow. 
if ; ‘ From Kusel. 
, earbonarius, Bronn. 
It had evidently escaped his notice that Sowerby states that his Unio wniformis 
did not occur in the Coal-measures, and, in addition, there is not the slightest 
resemblance between these two forms, as was pointed out later by de Koninck, 
and the name Unio Goldfussianus was given by him to Goldfuss’s shell. I believe 
it really belongs to the genus Anthracomya. Goldfuss’s description of the genus is 
evidently given from recent specimens. He enumerates as characteristic a pearly 
interior, eroded (abgeriebenes) umbones, cardinal lateral teeth; and he remarks 
that it is supposed because all recent forms inhabit fresh water that fossil forms 
indicate the same conditions, and that the Coal, Lias, and Oolite forms have been 
referred to this genus from external appearances, although their interiors are 
almost unknown. Unio carbonarius, Goldfuss, differs entirely from Unio carbo- 
narius, Bronn. The originals of Goldfuss’s figures are said to be in the museum at 
Bonn, but Professor Schliiter tells me that he has searched for the figured 
specimens, and they are not to be found. He states that there are a few named 
specimens, but so badly preserved and so fragmentary that no opinion can be 
based on them. 
1840. It was in 1840 that Professor Prestwich published his paper on the 
Coalbrookdale Coal-field, in the Appendix of which James DeCarle Sowerby 
described and figured twenty species of bivalves from that district.’ This paper 
was read, however, before the Geological Society on February 5th, 1834, and 
April 13th and 27th, 1836. 

1. Donazx ? sulcata. 11. Unio phaseolus. 
2. Venus ? earbonaria. 12. ,, aquilinus. 
3. Nucula xqualis. 13. ,, centralis. 
4.  ,,  accipiens. 14. ,, robustus. 
Bae acutas 15. Modiola carinata. 
6. Unio Urit. 16. Mytilus triangularis. 
fe, 53) Ansticer. 17. Avicula quadrata. 
8. 5, parallelus. 18. 3,  modiolaris. 
9. ,, dolobratus. 19. Pecten gentilis. 
10. ,, modiolaris. 20. »  scalaris. 
Of these, Nos. 1 to 8, and 19, 20, are marine forms. Unio Urii is certainly 
wrongly referred to Ure’s shell ; for it belongs to quite a different genus, probably 
Edmondia, to which also Unio Ansticei and U. parallelus may be referred. 
1 «Trans. Geol. Soc.,’ 2nd series, vol. v, 1840. 
