74 EXPLANATION OF THE PLATES. 
PLATE, XXY, 
FOSSILS OF THE LUDLOW ROCKS. 
MOLLUSCA.—BRACHIOPODA. 
Fig. 1.—a, 6. Lingua Lata, Sowerby. 
Sil. Syst., p. 618, pl. viil., fig. 11. 
a,b. From Brit. Sil. Brach., pl. iii., fig.40, 42. Lower Ludlow, Elton, near Ludlow. 
Ludlow. Sil., 4th edition, p. 525. Mr. Davidson, in Brit. Sil. Brach., p. 50, 
states the occurrence of this small but characteristic shell, in the Aymes- 
try Limestone of Mocktree, near Leintwardine, Shropshire ; in the typi- 
cal localities near the town of Ludlow it is found in the Lower Ludlow 
rocks, as well as at Ledbury and Aymestry. It also occurs at Kendal, 
and in Scotland, in the Ludlow beds of the Pentland Hills. 
Fic. 2.—a, b,c. Pentamerus Kniauru, Sowerby. 
Min. Conch., pl. xxviii. (P. Aylesfordii); ibid., pl. xxix., Sil. Syst., p. 615, 
pl. vi., fig. 8. 
a. Original. Front view; reduced to two-thirds of natural size. 6. Side 
view of the same shell, Aymestry limestone, Aymestry. Mus. G.S. I. 
c. From Brit. Sil. Brach., pl. xvi., fig. 3. Longitudinal section, showing 
internal plates, Aymestry limestone, Bodenham, Woolhope. 
WENLOcK anp LupLow.—Sil., 4th edition, p. 527. “The most characte- 
ristic shell of the Aymestry Limestone ;” ibid., p. 130. P. Knightii oc- 
curs rarely in the Wenlock and Ludlow formations ; but it is exceedingly 
common in the Aymestry Limestone, at Mocktree, near Ludlow; at 
Aymestry, in Herefordshire ; and at Leintwardine, Shropshire. It occurs 
near Wolverhampton, and in the Abberley and Woolhope Districts, all 
in the Aymestry Limestone, as well as in the Wenlock Limestone of Wal- 
salland Wenlock Edge. Brit. Sil. Brach., p. 144. In Ireland it bas 
been found at Doonquin and Great Blasket Island, Kerry. 
CONCHIFER A. 
Fic. 3.—a, 6. AvicuLa Dansyt, Jf‘ Coy. 
Brit. Pal. Foss. p. 258, pl. ii., fig. 11-15. 
a. Original. Reduced to two-thirds of natural size. Left, or convex and 
radiated valve. Upper Ludlow, Kendal. Mus. G.S.I. 0b. From Brit. 
Pal. Foss., pl. it, fig. 15. Reduced to half natural size. Right, or flat 
unradiated valve, from the same locality. 
