16 CARBONICOLA, ANTHRACOMYA, AND NAIADITES. 



1. JJnio abbreviatus, Goldf. 



2. ,, utratus, Goldf. 



3. ,, tellinarius, Goldf. 



4. „ subconstrictus, Sow. 

 „ uniformis, Sow. 



,, carbonarius, Broim. 



From Liege. 



From Kusel. 



It had evidently escaped his notice that Sowerby states that his JJnio uniformis 

 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 JJnio 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. JJnio carbonarius, Goldfuss, differs entirely from JJnio 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. 1 This paper 

 was read, however, before the Geological Society on February 5th, 1834, and 

 April 13th and 27th, 1836. 



1. 



Donax ? sulcata. 



2. 



Venus ? carbonaria 



3. 



Nucula xqualis. 



4. 



,, accipiens. 



5. 



„ acuta. 



6. 



JJnio TJrii. 



7. 



„ Ansticei. 



8. 



„ parallelus. 



9. 



„ dolobratus. 



10. 



„ modiolaris. 



11. 



JJnio pkaseolus. 



12. 



„ aquilinus. 



13. 



„ centralis. 



14. 



„ robustus. 



15. 



Modiola carinata. 



16. 



Mytilus triangularis. 



17. 



Avicula quadrata. 



18. 



,, modiolaris. 



19. 



Pecten gentilis. 



20. 



„ scalaris. 



Of these, Nos. 1 to 8, and 19, 20, are marine forms. JJnio TJrii is certainly 

 wrongly referred to Ure's shell ; for it belongs to quite a different genus, probably 

 Edmondia, to which also JJnio Ansticei and U. parallelus may be referred. 



1 'Trans. Geol. Soc.,' 2nd series, vol. v, 1840. 



