SUPPLEMENT, PLATE XVIL 



Fig. 

 1 a, b, c. Lingula Canadensis, Bill. Llandeilo, Balcletchie Conglomerate. Coll. of Mrs. R. Gray. 1 c. 



Portion of exterior sculpture greatly magnified. (P. 202.) 

 2, 3. „ quadrata, Eichw. Llandeilo, Craighead. Coll. of Mrs. R. Gray. (P. 203.) 



4. ,, Brodiei, Dav. Lower Wenlock, Little Hope quarries, Woolhope. Coll of Rev. P. B. 



Brodie. (P. 204.) 



5. „ Philipi, Dav. Upper Llandovery, Minsterley, Salop. Coll. of Mr. R. Philip. (P. 206.) 

 6 — 11. „ Ram.sayi,^a\.ieT. Llandeilo, Craighead and Balcletchie, Ayrshire. Principally from the 



coll. of Mrs. R. Gray. (P. 206.) 

 12. „ Leseuri, Rouault. From the drift of Moseley, Birmingham. (Lowest Llandeilo). 



(P. 204.) 

 13 — 19. „ attenuata, 8ow. 13. Llandeilo, Ardmillan Brae. 14, 15. Ditto, Balcletchie. Coll. of 



Mrs. E. Gray. 16. Llandeilo, Wrae Quarry, three miles south of 



Broughton, Peebleshire. Coll. of Geol. Survey of Scotland. 17. Lower 



Caradoc, Horderley, Shropshire. Coll. of Rev. P. B. Brodie. 18, 19. 



Llandeilo, Meadow Town, near Minsterley, Shropshire. Coll. of Mr. 



R. Philip. (P. 206.) 

 20,21. „ ^rraww/a^ff, Phillips. Llandeilo, Ardmillan Brae, Ayrshire. Coll. of Mrs. R.Gray. (P.207.) 



23,24. „ Sysmondi, Saher. 23. Ludlow, Pentland Hills. CoU. of Mr. J. Henderson. 24. Upper 



Llandovery, Penkill, Girvan. Coll. of Mrs. R. Gray. (Sil. Mon., p. 45.) 

 25. „ ot^ff^a, ? M'Coy. Upper Caradoc, Drummuck, Girvan. Coll. of Mrs. R. Gray. (P.207.) 



26 — 30. ,, brevis, Portlock. 26. Llandeilo, Cairn Burn, Dumfriesshire, Coll. of the Geol. 



Survey of Scotland. 27 — 30. Middle Caradoc, White House Bay, 



Girvan District. Coll. of Mrs. R. Gray. (P. 207.) 

 31, 32. Lingulella Nicholsoni, Callaway (after Callaway). Sbineton shales, Shineton. Coll. of Dr. 



C. Callaway. (P. 208.) 

 33,34. „ primcBva,]^\cks. 33. (After Hicks's original figure.) 34. Purple sandstone at Caerfai, 



Nun's Well, from the very base of the Cambrian, St. David's. (P. 208.) 



35. ,, ferruginea, Salter. Red purple beds, basal beds of the Harlech, St. David's. (Sil. 



Mon., P. 336.) 



36. Lingula brevis, Portlock, ? Middle Caradoc, Shallock Mill, Girvan District. Coll. of Mrs. 



R. Gray. (P. 207.) 



37. 38. Discina Caerfaiensis, Hicks (after Hicks). Middle Caerfai groups. Lowest Cambrian at 



St. David's, associated with Lingulella prim(BVu. 37. Nat. size. 



38. Enlarged. (P. 209.) 

 39,40. ,, Portlockii, Geiniiz. 39. Lower Llandeilo, Moffat, Dumfriesshire. Museum of the Geol. 



Survey of Scotland. 40. Caradoc?, Balligrot, County Down, Ireland 



(after Swanston, ' Proc. of Belfast Field Club,' pi. vii, fig. 22). (P. 210.) 

 41,42. „ '( Balcletchiensis, Dav. 41. Llandeilo, Balcletchie. 42. Upper Caradoc, Thraive, Ayrshire, 



and coll. of Mrs. R. Gray. (P. 210.) 

 43 — 46. ,, oblongata, Portlock. 43 — 45. Llandeilo, Ardmillan Brae, and Balcletchie, Ayrshire. 



Coll.of Mrs. R Gray. 46. Llandeilo, Dobbs Linn, near Moffat. Coll. 



of Prof. H. B. Nicholson. (P. 209.) 



47. „ perrugata,M'Coy. Llandeilo, Craighead, Ayrshire. Coll. of Mrs. R. Gray. (P. 210.) 



48. Pholidops (crania) implicata, Sow., sp. Middle Llandovery, Penkill beds, Penwhapple Glen, 



Ayrshire. Coll. of Mrs. R. Gray.' (P. 216.) 

 49—53. Crania Siluriana,'D&v. 49. Nat. size. 49 a. Enlarged. Wenlock limestone, Dudley. Coll. 

 of Mr. John Gray. 50. A smaller specimen. 51, 52. Lower 

 Llandovery, Mullock Hill. 52. Middle Llandovery, Newland beds, 

 Ayrshire. Coll. of Mrs. R. Gray. (P. 215.) 

 54—56. „ Crofti, Dav. Caradoc, Ty-isaaf, Llansantffraid, Wales. Coll. of Mr. Croft. 54. 



Internal cast, nat. size. 54 b. Impression taken from the cast to 

 show the interior of the valve. 55. Smaller specimen, showing the 

 exterior. 56 and 56 a. Another small example, same locality. (P. 215.) 



CARBONIFEROUS 



57. „ Ryckholtiana, De Kon. Lower Carboniferous limestone, Townland of Legilly, near 



Castlecaulfield, County Tyrone, Ireland, and Museum of the Geolo- 

 gical Survey of Ireland. (P. 216.) 



