ORGANIC REMAINS OF THE CARBONIFEROUS LIMESTONE.

161

England and of South Wales into an upper zone which is productive of coal, and a lowerin which no traces of the mineral have been discovered, will in the sequel assist us in

establishing important inferences, concerning the age of the ctJm-bearing rocks ofPembrokeshire and Devonshire.

The undermentioned fossils have been found in the carboniferous limestone of Shropshire , Mon­ mouthshire and South Wales :

Chief Localities,

Chief Localities.

Spirifer papilionaceus. Phill. pi. 11. f. 6.

_ , . , . _ r Coal Brook Dale

Eroductus hemisphcencus. M.C. t. 238. -J

l and Oswestry .

- Martini. M.C. t. 318. f. 2,3 &4. Clee Hills, &c.

M.C. t. 238. |

radialis. Phill. pi. 11. f. 5. V Pembrokeshire.

resupinatus. Phill. pi. 11 . f. 1 _ J

Salop and South Wales .

como'ides. M.C. t. 239.

semicircularis. Phill. pi. 9. f. 15 a Littleton on Se-

— —semicircularis. Phill. pi. 9. 1. 15 i Littleton on&16./ vern.

vern.

costatus *. Phill. pi. 7. f. 2. ... Oswestry , &c.

bisulcatus. M.C. t. 494. f. 1 iV 1 ? . 1

cuspidatus. M.C. t. 120. Clee Hills, Shrop-

distans. M.C. t. 494. f. 3. shire.

margaritaceus. Phill. pi. 8. f. 8.")

setosus. Phill. pi. 8. f. 9.

punctatus. Phill. pi. 8. f. 10.

octoplicatus. M.C. t. 562. f. 2,3 & 4._

Spirifer attenuatus. Phill. pi. 9. f. 13. ^Pembrokeshire.

Terebratula fungites. MSS. Phill.'

ambigua. Phill. pi. 11. f. 21.radialis. Phill. pi. 12. f. 40

►Pembrokeshire.

connwens. Phill. pi. 11. f. 2.

imbricatus. Phill. pi. 10. f. 20_

& 41

filiarius. Phill.pl. 11. f. 3._

Crinoidea occur in vast profusion, including genera and species described by Miller from the limestone of Bristol. Corals

also are in parts very abundant (see chap. 7). Orthocerata are very rare, and I never found one with well-marked

characters. Trildbites are also scarce, but a few examples of them have been detected by the Earl of Cawdor in the coast

cliffs near Stackpole, Pembrokeshire, among which are caudal portions of Asaphus seminiferus and A. granuliferus ofPhillips. The Ichthyodorulites of this formation are of peculiar forms and have been described by M. Agassiz; among themis the Ctenacanthus tenuistriatus of the Clee Hill limestone, (p. 119.). Other species occur near Bristol.

Considering this formation to be well known, I did not collect many organic remains, so that after all the list is very in-complete. We may, however, consider it as a sample of specimens taken from various localities; and viewing them in thislight it is worthy of remark, that every species above enumerated has been previously described by Professor Phillips asoccurring in the limestone of this age in other and distant tracts. On the southern edge of the South Welsh coal-field, par-ticularly between the Mumbles and Pennard, west of Swansea , the carboniferous limestone has been diligently explored bymy friend Mr. Dillwyn, M.P., whose skill in conchology has enabled him to detect many species in addition to those com-monly observed in the formation. In his list, which has not yet been published, he enumerates—

Ammonites'! and Goniatites, 2; Bellerophon , several species; Cirrus! several; Dentalium, 1; Euomphalus several;Eulima! 1; Littorina, 3; Lntraria, 1; Melania, 3; Nalica, 1; Orthocerata, several; Turbo, 1; Trochus,3; Turritella, 4;Rotella, 1, &c. Among these also Professor Phillips has also recognised many published in his work, while Mr. J. de C.Sowerby coincides with me in opinion that not one of these species has yet been found in the Old Red or Silurian Systems.

1 For the sake of uniformity and to prevent the possibility of error, the names Spirifer and Productus areused throughout. Mr. Phillips writes Spirifera and Producta.