EXPLANATION OF THE PLATES, ae. 
occurs in the same localities as the preceding, but is most abundant in the 
Wenlock shale of Parkes’ Hall, near Dudley, at Walsall; and also in the 
Woolhope limestone of Malvern. Var. Wvodwardii is found in the Wen- 
lock limestone of Dormington Wood, Woolhope, and Wenlock shales, near 
Dudley. Brit. Sil. Brach., pp. 59, 60. 
Fie. 7.—a, 6, c. ORBICULOIDEA ForBeEsu, Davidson. 
Orbicula Forbesii, Mem. Geol. Surv., vol. ii., part i., p. 371. 
a. View of upper valve. From Brit. Sil. Brach., pl. vii., fig. 16. Wenlock 
limestone, Dudley. 
b. Foraminated or lower valve. Wenlock limestone, Malverns; from the 
same plate, fig. 14. 
ce. View showing position of upper and lower valve; from same plate ; fig. 16a. 
VENLocK.—Sil., 4th ed., p. 526. O. Forbesii has been found in the Wool- 
hope beds and Wenlock limestone and shales. It occurs in the Wenlock 
limestone of Dudley, Dormington Wood, Woolhope; at Vinnals Farm, 
Malvern; and at Marloes Bay. Brit. Sil. Brach., p. 74. 
