76 EXPLANATION OF THE PLATES. 
Fic. 7.—MopDI0LOPsiIs COMPLANATA, Sowerby, sp. 
Pullastra. Sil. Syst., p. 609. Modiolopsis. Sil., 4th edition, p. 530. 
From he figure in Sil. Syst., pl. v., fig. 7. Upper Ludlow, near Bridg- 
north. 
Ludlow. Sil., 4th edition, p. 530. An Upper Ludlow fossil of the Mytiloid 
group of shells; ibid., p. 229. It is recorded under the name of Myti- 
lus complanatus, as occurring in the Usk, Llandeilo, and Freshwater 
Districts. Mem. Geol. Surv., vol. 11., pt.1., p. 267. In Ireland it has 
been collected at Clogher, Kerry. Mus. G.S, I. 
Fig. 8.—MopioLopsis PLATYPHYLLA, Salter, sp. 
Mytilus. Mem. Geol. Surv., vol. i1., pt. 1, p. 268, and Appendix, p. 564. 
Modiolopsis. Sil., 4th edition, pp. 229, 530. 
Reduced to two-thirds of natural size. Irom the figure in Mem. Geol. Surv., 
vol. ii., pt. 1, pl. xx., fig. 13. Uppermost Ludlow (Tilestone), Trich- 
rug, Llandeilo. 
Luptow.—Sil., 4th edition, p. 530.  ‘* Characteristic of the uppermost 
Ludlow beds ;” ibid., p, 229. 
Fic. 9.—OrRTHONOTA AMYGDALINA, Sowerby, sp. 
Cypricardia? Sil. Syst., p. 609. Orthonota, Sil., 4th edition, p. 530. 
From the figure in Sil. Syst., pl. v., fig. 2. Upper Ludlow, Ludlow. 
LLANDOVERY AND LupLow.—Sil., 4th edition, p. 530. “ Abundant in the 
Ludlow Promontory, and very generally characteristic of the Upper 
Ludlow rocks.” Sil. Syst., p. 609. It is recorded as occurring in the 
Malvern, Abberley, Woolhope, May Hill, Usk, Builth, and Llandeilo 
Districts. Mem. Geol. Surv., vol. i., pt. 1, p. 265. It is also common 
in the Upper Ludlow quartzite of Kendal, Westmoreland. 
Fie. 10.—OrtHONoTA PRORA, Salter. 
O. semisulcata, M‘Coy, Brit. Pal. Foss., p. 275. O. prora, Sil., 4th edition, 
pp. 229, 530. 
From the figure in Brit. Pal. Foss., pl. 1 K., fig. 25. Upper Ludlow, near 
Kendal. 
Lupitow.—Sil., 4th edition, p. 530. “ Not uncommon in the quartzite of 
Kirkby Moor, Kendal.” Brit. Pal. Foss., p. 270. 
Fic. 11.—GoNIOPHORA CYMB@FORMIS, Sowerby, sp. 
Cypricardia, Sil. Syst., pp. 602, 609. Goniophora, Sil., 4th edition, p. 530. 
From the figure in Sil. Syst., pl. v., fig. 6. Upper Ludlow, Ludlow. 
LLANDOVERY AND LupLow.—Sil., 4th edition, p. 530. “One of the most 
abundant Upper Ludlow shells ;” ibid., p. 229. It is recorded as oc- 
curring in the Malvern, Abberley, Woolhope, May Hill, Usk, Builth, 
Llandeilo, and Marloes Districts. Mem. Geol. Surv., vol. ii., pt. 1, 
p. 267. 
