EXPLANATION OF THE PLATES. él 
Fie, 12.—Crenoponta, ANGLIcA, D’ Orbigny, sp. 
Nucula? ovalis, Sil. Syst., p. 609. Ctenodonta Anglica, Sil., 4th ed., 
529 
From the figure in Sil. Syst., pl. v., fig. 8. Upper Ludlow, Trewerne 
Hills, Radnorshire. 
LANDOVERY TO LupLow.—Sil., 4th ed., p. 529. This species is stated 
to occur in Upper Ludlow rocks at several localities in the Malvern Dis- 
trict ; also in the Woolhope, Usk, and Llandeilo Districts. Mem. Geol. 
Surv., vol. ii., pt. 1, p. 269; and in the Wenlock rocks at Fron Fawr, 
near Llansannan, North Wales. M.G.S., vol. iii., p. 280. 
Fic. 13.—CucULLELA ANTIQUA, Sowerby, sp. 
Cucullela, Sil. Syst., p. 602. Cucullela, Sil., 4th ed., p. 530. 
From the figure in Sil., 4th ed., pl. xxxiv., fig. 16. Upper Ludlow, 
Horeb Chapel, near Llandovery. 
? Caravoc, LLANDoVERY, AND LupLow.—Sil., 4th ed., p. 530. ‘*A com- 
mon shell in the Uppermost Ludlow, ‘Tilestones;’” ibid., p. 280. 
It is recorded as occurring in the Malvern, Abberley, Woolhope, Usk, 
Llandeilo, and Freshwater Districts. Mem. Geol. Surv., vol. i., pt. 1, 
. 268; also in Wenlock rocks at Mynydd, Tryfan, near Llansannan, 
North Wales. Mem. G.S., vol. iii., p. 280. 
Fig. 14.—a, 6. CucuLLELA coarcraTa, Phillips, sp. 
Nucula, Mem. Geol. Surv., vol. ii., pt. 1, p. 866. Cucullela, Sil., 4thed., 
From the figures in M. G.S., vol. ii., pt. 1, pl. xxii, figs. 1, and 2. 
Ludlow rocks, Freshwater East, Pembrokeshire. 
UDLow.—Sil., 4th ed., p. 530. ‘Found in great plenty in the Ludlow 
rocks of Pembrokeshire, and occurs also in the Wenlock Shale. Itis also 
recorded as occurring in Westmoreland and Denbighshire. Cat. Brit. 
Foss., p. 194. 
Fig. 15.—a, b. ANODONTOPSIS PEROVALIS, Salter, sp. 
Mytilus. Mem. Geol. Surv., vol. ii., pt. 1, p. 363. Anodontopsis. Sil., 
Ath ed., p. 529. 
From the figures in M. G. S., vol. ii., pt. 1, pl. xx., figs. 2, 2a. Lud- 
low rocks, Llanbadoc, Usk. 
Ludlow.—Sil., 4th ed., p. 529. 
Fig. 16.—GRAMMYSIA TRIANGULATA, Salter, sp. 
Orthonota, Mem. Geol. Surv., vol. ii., pt. 1, p. 361. 
Grammysia, Sil., 4th ed., p. 530. 
Original. Ludlow rocks, Kendal. 
Wentiock anv Luprow.—Sil., 4th ed., p. 530. ‘A typical Ludlow 
ene) fossil ;” ibid., p. 230. ‘Trichrug, Llangadoc, and Westmore- 
and. 
M 
