EXPLANATION OF THE PLATES. 65 
PLATE XXII. 
FOSSILS OF THE WENLOCK ROCKS. 
MOLLUSCA.—HETEROPODA. 
Fic. 1.—a, 6. BELLEROPHON DILATATUS, Sowerby. 
Sil. Syst., p. 627, pl. xii., figs. 23, 24, Sil., 4th edition, Foss. 41, fig. 8, pl. 
xxv., figs. 5, 6. 
a, From Sil. Syst., pl. xii., fig. 23. View of Aperture, natural size. Wen- 
lock Shale, Burrington, near Ludlow. 
b, From Sil., 4th edition, Foss. 41, fig. 8, p. 199. Side view, much reduced 
in size. 
Carapoc To Wentock.—Sil., 4th edition, p. 533; ‘one of the largest He- 
teropod or Nucleobranch shells in the Ludlow and Wenlock rocks ;’ 
ibid., p. 2382. Lower Llandovery, Ayrshire; and Upper Llandovery, 
Shores of Lough Coolin, Co. Galway; and Lough Corrib, Co. Mayo ; 
Mus. G. 8. I. Caradoc, Desertcreat, Tyrone ; Portl. Geol. Rep., p. 398, 
Pemex, ie A, 
Fic. 2.—BELLEROPHON WENLOCKENSIS, Sowerby. 
Sil. Syst., p. 705, pl. xii, fig. 21, Sil., 4th edition, pl. xxv., fig. 7. 
From the figure in Sil. Syst. op. cit. Wenlock shale, Croft, Malvern. 
WENLocK.—Sil., 4th edition, p. 534. This and the preceding species ‘are 
characteristic Wenlock fossils,” Sil., 4th edition, p. 121. “B. Wen- 
lockensis is very characteristic of the strata implied in its name ;”’ ibid., 
p. 232, 
PTEROPODA. 
Fig. 3.—a, 6. THeca Anceps, Salter. 
Mem. Geol. Surv., vol. ii., pt. 1, p. 355, pl. xiv., fig. 1. 
a,b, From Mem. Geol. Surv. op. cit.; a, Natural size; b, Enlarged ; Wen- 
lock Shale, Eastnor Castle, Malverns. 
WeNLOocK AND Luptow,—Sil., 4th edition, p. 534; ‘‘a Wenlock shale 
species ;”’ ibid., p. 232. 
