64 EXPLANATION OF THE PLATES. 
Fig. 10.—MURCHISONIA BALTEATA, Phillips, sp. 
Pleurotomaria, Mem. Geol. Surv., vol. ii. pt. 1, p. 358, pl. xv., figs. 1, 2. 
Murchisonia, Sil., 4th edition, p. 532. 
From Mem. Geol. Surv., op. cit., pl. xv., fig. 1. Wenlock Limestone, 
Hobbes, Longhope, near Woolhope. 
WenNLOocK.—Sil., 4th edition, p. 532. Rock farm, May Hill, M. G. S., op. 
cit., p. 358. 
Fie, 11.—a, b. AcrocuLia ProToTYPA, Phillips, sp. 
Nerita, Mem. Geol. Surv., vol. ii., pt. 1, p. 858. NV. spirata, Sil., Syst., p. 
625, pl. xi, fig. 15. Acroculia, Sil., 4th edition, p. 531, pl. xxiv., fig. 8. 
Original. a, Showing mouth; b, back of the same shell; Wenlock Lime- 
stone, Wenlock Edge. Mus. G. 8. I. 
Wentock.—Sil., 4th edition, p. 531. Localities, Woolhope Limestone, 
Presteign, Explanation of pl. xxiv. ; ibid. ‘* Acroculia haliotis, and A. 
prototypa, are exceedingly abundant, (the first especially), in the Wenlock 
Limestone ;”’ ibid., p. 231. 
Fic. 12.—ACROCULIA HALIOTIS, Sowerby, sp. 
Nerita, Sil., Syst., p. 625, pl. xii, fig. 16. Acroculia, Sil., 4th edition, p. 
31, pl. xxiv., fig. 9. 
Original. From Wenlock Limestone, Ledbury, Herefordshire; Mus. G.S. I. 
LLANDOVERY AND WENLOCK.—Sil., 4th edition, p. 531. 
Llandovery Rocks, St. Ishmael’s Church ; Mus. G. 8. I. 
Wenlock Limestone, Ledbury, ‘‘ exceedingly abundant in Wenlock Lime- 
stone ;” ibid., p. 231. Llandovery, Ayrshire; W. LZ. Dudley ; Cat. Brit. 
Foss., p. 239. It has been collected from the Wenlock rocks of the 
Dingle promontory, S. W. of Clogher Head, Kerry; and Ludlow rocks, 
Derrymore Glen, Kerry ; Mus. G.S. I. 
