72 EXPLANATION OF THE FLATES. 
Fic. 8,—a, b,c. RHYNCHQNELLA WILSONI, Sowerby, sp. 
Terebratula, J. Sowerby, Min. Conch., pl. exviii., fig. 3. Sil. Syst., p. 615, 
pl. vi., fig. 7a. Rhynchonella, Sil., 4th edition, p. 527. 
a, Front view. 6. Side view. From Brit. Sil. Brach., pl. xxii, fig. 1, la. 
Upper Ludlow, 8. W. of Hazle, Woolhope. 
ec. Original. Internal casts. Black Point, ;Dingle Promontory, Kerry. 
Mus. G. S. I. 
Lianpovery To Luptow.—Sil., 4th edition, p. 527. ‘* This species has been 
met with in Llandovery Rocks of the S. of Scotland,” and Tynewidd, 
Llandovery, “and is thenceforward persistent throughout all the deposits 
to the Upper Ludlow inclusive ;” ibid., p. 210, “ one of the species which 
chiefly distinguish the Ludlow Rocks; ibid., p. 226.” In Upper 
Iudlow Rocks it occurs at Brockton, and Burton; Delbury, Salop; 
near Malvern, and at various places in the Woolhope District. In Ay- 
mestry Limestone at Sedgley ; Aymestry; Abberley ; Llanbaddock, &c., 
in the Usk District. In Lower Ludlow Rocks, of the Builth District. 
In Wenlock Limestone and Shale, near Dudley, Walsall; East of Led- 
bury; Malvern; Ge., and in beds above the Denbighshire Grit, North 
Wales. In Scotland it has been found in the Wenlock Shale. of the 
Pentland Hills, and in the same formation at Clogher Head, Kerry. 
Brit. Sil. Brach., pp. 171-2. 
Fic. 9:—a, 6, RHYNCHONELLA NUCULA, Sowerby, sp. 
’ ? > Y, Pp 
Terebratula. Sil. Syst., p. 611, pl. iii., fig. 1, v., fig. 20. 
Rhynchonella. Sil., 4th edition, p. 527. 
a. Original. A group of shells in various positions, Upper Ludlow, Lille- 
shall, Shropshire. Mus. G.S. I. 
b. Original. Internal cast, Upper Ludlow, Malvern. Mus. G. S. I. 
LLANDOVERY TO LupLtow. Sil., 4th edition, p. 527. ‘A common fossilof the 
Upper Ludlow Rock ;” ibid.; pp. 135,226. Localities : Lower Llando- 
very, Cefn Rhyddan, &c., Upper Llandovery, Worcester Beacon; Mar- 
loe’s Bay ; May Hill; Damory Bridge. Woolhope Limestone, Wool- 
hope, Bogmine Shelve. Wenlock Limestone, Eastnor Castle ; Malvern; 
Woolhope District ; Wenlock Edge, Dudley; Rock Farm, Longhope; 
Plas Madoc, &c., North Wales; Lower Ludlow, Woolhope District, 
Leintwardine, Shropshire, &c. Aymestry Limestone, Malvern, Wool- 
hope, and Usk Districts, &e. Upper Ludlow, Malvern; May Hill, and 
Builth Districts ; Collinfield and Benson Knot, Westmoreland. In Scot- 
land it occurs in the Wenlock Shales of the Pentland Hills; and in 
Ireland in Wenlock Rocks of the Dingle Promontory, Co. Kerry. 
Brit. Sil. Brach., pp. 183-4. 
Fie. 10.—a, b, ce. Orruis LuNATA, Sowerby. 
Sil. Syst., p. 611, pl. i., fig. 125; v., fig. 15. 
a, External Shell. 0b. Side view of do. From Brit. Sil. Brach., pl. xxviii., 
fig. 1. Upper Ludlow, Wonder, Woolhope. ec. Internal and external 
casts; ibid., fig. 2, Whitecliff, near Ludlow. Ludlow. ‘‘ This species 
occurs abundantly in the Upper Ludlow at Whitecliff, and in severai 
other localities near Ludlow in Shropshire. Prof. Phillips and Mr. 
