68 EXPLANATION OF THE PLATES. 
WENLock.—Sil., 4th edition, p. 517. “ #. punctatus and E. variolaris are 
known by the name ‘ Strawberry-headed’ by collectors, and are found on 
every slab of Wenlock Limestone, but seldom perfect, except at Dudley ;” 
ibid., p. 234. Localities: Wenlock Limestone and Shale, Dormington 
Wood, Woolhope ; Dudley and Walsall (abundant). M. G.S., Dee. 
Vii. Explanation of pl. iv., p. 7. Wenlock Edge, Sil. Syst., p. 655. 
Fic. 4.—a, 6. Ittanus Barnriensis, Murchison, sp. 
Des Sil Syst., p. 656, pl. vii., bis., fig. 3, a-d. 
Illenus, M. G.S.., Dee 2, pl. ii., andiv. Sil, 4th edition, pp. 111, 518. 
Foss. 17, fie. 2 
From M. G. §S., Dee. 2, pl. iii.; a, reduced to two-thirds of natural size. 
Barr, Staffordshire ; 6, from the same plate, fig. 3, young coiled specimen. 
LLANDOVERY AND WENLock.—Sil., 4th edition, p. 518. ‘‘ This fine fossil 
ranges from the lowest Wenlock beds to near the top of the Upper 
Silurian. It is one of the chief fossils, and is of the largest size in the 
Lower Wenlock or Woolhope Limestone, and is found in the pipe clay 
beds of that formation at Malvern; ibid., pp. 111, 121, and 235. 
Localities: Hay Head, near Barr, Staffordshire; Dudley ; Ledbury. 
Woolhope, Nash Scar, Presteign, Herefordshire. M. G. S., Dee. 2. 
Description of pl. iii., and iv., p. 3. 
Fig. 5.—a, d. PHAcops caupatus, Brinnich, sp. 
Asaphus, Brong. Crust. Foss., pl. ii., fig. 4 A-D. A. caudatus et tuberculato- 
caudatus, Sil. Syst., p. 654, pl. vil., fig. 8. a, 6, Phacops, Mem. Geol. 
Surv., Dec. 2, pl. i. 4th edition, D: 520. 
a. From M. G. S., Dec. 2, pl. i, fig. . 0. Eye ofa larger specimen from 
Sil., 4th edition, pl. xviii., fic. Te se Eye lenses enlarged. Wenlock 
Limestone, Dudley. d. Labrum or hypostome. From Dee. 2, pl. iii., 
fig. 3, Ledbury. 
LANDoVERY To LupLow.—Sil., 4th edition, p. 520. ‘ Distributed through- 
out the Saree districts from Llandovery to Upper Ludlow Rocks.” 
M.G.S., Dec. 2, p. 5. ‘* Rare in Llandovery rocks,” Sil., 4th edition, 
p- 213. With its variety, P. longicaudatus, very common in Wenlock 
and Ludlow Rocks ;” ibid., p. 235. Westmoreland ; Denbighshire. The 
Shales of Kireudbright, Scotland. M. G. S., Dec. 2, p. 5. The Dingle 
District, Co. Kerry. Mus. G. S. I. 
Iie. 6.—PuHacops DowninciH, Murchison, sp. 
Calymene? Sil. Syst., p. 655, ae xiv., fig. 38. Phacops, Mem. Geol. Surv., 
vol. il., pt. i., pl. v. figs. 2-4, Sil., "4th edition, p. 520, pl. xviii, fig. 2-5. 
Original. Wenlock Limestone, Dudley. Mus. G.S. I. 
LLANDOVERY To Lupitow. Sil., 4th edition, p. 520. Upper Llandovery. 
Localities: Marloes Bay, Pembrokeshire ; Norbury ; and Bogmine, 
Shropshire. M.G.S., vol. ii, pt. i., p. 360. Wenlock Limestone, 
Dudley ; Ludlow Rock, Pembrokeshire ; Kendal, Westmoreland. * This 
Trilobite is one of the most characteristic, par ticularly i in the environs 
of Dudley.”’ Sil,, 4th edition, p, 121. 
