78 EXPLANATION OF THE PLATES. 
EAE eee vay 
FOSSILS OF THE LUDLOW ROCKS. 
MOLLUSCA.—GASTEROPOD A. 
Fig. 1.—LOXoNOoMA sINuOSA, Sowerby, sp. 
Terebra, Sil. Syst., p. 619. Loxonema, Sil., 4th ed., p. 532. 
From Sil. Syst., pl. vii., fig. 15, Lower Ludlow, Aymestry. 
LLANDOVERY AND Luptow. Sil, 4th ed, p. 532. ‘Chiefly a Ludlow 
rock species ;” ibid., p. 231. It is recorded as occurring in the Mal- 
vern, Usk, Llandeilo, and Marloes Districts. Mem.G. S., vol. ii, pt. 1, 
p. 258; and in Wenlock rocks, near Llansannan, North Wales. Mem. 
Surv., vol. iii, p. 280. In Ireland it has been collected by the Geol. 
Surv. at Curracullenagh, Co. Kerry. 
Fic. 2.—HOLOPELLA OBSOLETA, Sowerby, sp. 
Turritella, Sil. Syst., p. 603. Holopella, Sil., 4th ed., p. 532. 
From Sil. Syst., pl. i., fig. 7a, Upper Ludlow, Horeb Chapel, 
Felindre. 
LLANDOVERY AND Lupiow. Sil., 4thed., p. 532. ‘A frequent fossil of 
the uppermost Ludlow rocks in Westmoreland, Shropshire, and South 
Wales ;” ibid., p. 231. Its occurrence is recorded in the Malvern, Usk, 
and Llandeilo Districts. Mem. G. S., vol. ii., pt. 1; also in Upper 
Llandovery at the Bogmine, near Shelve, Shropshire. M. G. S., vol. ii, 
p- 862; and at Tortworth, Gloucestershire. Sil., 4th edition, Explana- 
tion to pl. ix. 
Fic. 3.—a, b, c. PLATYSCHISMA HELICITES, Sowerby, sp. 
Trochus, Sil. Syst., p. 603. Platyschisma, Sil., 4th ed., p. 583. 
From ‘the figures in Sil. Syst., pl. ii, fig. 5; and Sil, 4th ed., pl. 
xxiv., fig. 12,13. Upper Ludlow, Horeb Chapel. 
LuanpeEi1o, LuANDOVERY, LupLow, AND PassAGE BEDS. Sil. 4th ed., 
p. 533. ‘The Tilestone is crowded with this species,” ibid., p. 231. It 
occurs in the IJandeilo and Marloes Districts. Mem. G. S., vol. ii., pt. 
1, p. 260; also in Upper Ludlow Rocks, at 'Trichrug, Llangadoc, and 
Kendal, Westmoreland ; Mus. G. 8. I. 
