8 CARBONICOLA, ANTHRACOMYA, AND NATADITES. 
The same writer is responsible for the following statement in his Appendix to 
the ‘Geol. Survey Memoir, Country round Wigan,’ 2nd edition, 1862, p. 43 :— 
“ With Goniatites, Anthracosia occurs in abundance, not actually discovered in the 
same layers, but closely intermixed, so that it is difficult to believe that one is a 
fresh- and the other a salt-water shell.” No other observer has made a similar 
statement ; but he goes on to say, ‘‘ Anthracosia acuta occurs in strata undoubtedly 
marine at Clitheroe ;”” and names the discoverer—a statement which is very vague 
as regards locality and horizon; and, as the specimen itself is not in evidence, it 
is impossible to place much reliance on this solitary find, which was probably 
another bivalve from the Carboniferous or Yoredale beds. 
There are at least two beds in Scotland in which Carbonicola (Anthracosia) and 
undoubted marine fossils appear to occur together; one of these is the “ Slaty- 
band” or ** Lingula-ironstone”’ of Lanarkshire, which contains— 
Lingula mytiloides. Anthracosia (Carbonicola) aquilina. 
»  sqguamiformis. 5 acuta. 
” 
Anthracosia (Carbonicola) subconstricta. 
(‘ Mem. Geol. Survey Scotland,’ Explanation of Sheet 23, pp. 89, 90, 1873.) 
This bed is probably equivalent to the Gannister Series in England, and belongs 
to stage H. 
The other bed is that at the base of the ‘‘ Cement-stone Group ” at Water of 
Leith, from which Dr. Rhind' and Captain T. Brown® have obtained a shell, 
according to the former, “from a bed of shale below ten feet of sandstone, but the 
marine character of the bed is not made out, and it is very probable from the 
plant remains in the Cement-stone Group that these beds are not marine. 
R. Etheridge, jun.,° records a similar shell (the original having been lost, the 
reference is somewhat doubtful) from hardened shale in a quarry on the north side 
of the Colinton Road, under Craiglockart Hill, near Edinburgh, at about the same 
horizon. 
It has generally been considered that Anthracoptera crassa (the Myalina crassa 
of Fleming, Etheridge, and others), which I have shown to be anatomically 
identical with the Naiadites (Anthracoptera) of the Coal-measures,‘ is a marine shell. 
It occurs at Cults, Pitlessie, Fife, in a bed almost completely composed of these 
shells, at the west end of the workings, now almost covered with talus ; but there 
are several broken specimens lying about with corals (Zaphrentis), Aviculopecten, 
fish remains (Megalichthys) and Stigmaria—a curious fauna, indicating the 
1 Rhind, ‘ Age of the Earth,’ p. 167, pl. ii, figs. a, 6. 
2 «Ann. and Mag. Nat. Hist.,’ ser. 1, vol. xii, pl. xvi, fig. 1, p. 894; ‘ Fossil Conchology,’ p. 178, 
pl. Ixxiu, fig. 8. 
3 * Quart. Journ. Geol. Soe. Lond.,’ vol. xxxiv, pl. ii, fig. 20, p. 16, 1878. 
* Hind, ‘ Geol. Mag.,’ Decade ITI, vol. x, Nov., 1893, p. 514. 
