80 EXPLANATION OF THE PLATES. 
Fic. 8.—ORTHOCERAS LUDENSE, Sowerby. 
Sil. Syst., p. 619. 
From the reduced figure in Sil., 4th ed., p.232. Foss. 62, fig. 2 (reduced 
from a specimen two feet in length). Lower Ludlow, Ludlow. 
Luptow.—Sil., 4th ed., p. 535. “ A frequent Upper Ludlow form ;” ibid., 
p. 232. It is recorded as occurring in the Malvern and Builth Districts. 
M. G. S., vol. iil., part 1., p. 247. 
Fic. 9.—PHRAGMOCERAS PYRIFORME, Sowerby, sp. 
Orthoceras. Sil. Syst., p. 620. Phragmoceras. Sil., 4th ed., p. 536. Re- 
duced to half the natural size. From Sil. Syst., pl. viii., fig. 19. Lower 
Ludlow, Leintwardine, Shropshire (abundant). 
Luptow.—Sil., 4th ed., p. 536. It occurs in the Malvern, Abberley, Wool- 
hope, and Llandeilo Districts. M. G. S., vol. ili., pp. 250, 251. 
ANNELIDA. 
Fig. 10.—a, 6. SERPULITES LONGISSIMUS, Murchison. 
Sil. Syst., p. 608. 
a. Original. Fragment of a compressed tube (natural size). Upper Ludlow, 
Woodbury Hill, Abberley. Mus. G. S. I. 
b. Original. Reduced to half natural size, from a specimen ten and a-half 
inches long. Upper Ludlow, Malverns. Mus. G. 8. I. 
WENLOcK and LupLow.—Sil., 4th ed., p. 514. “ Very common in the 
Ludlow rock ; some of the specimens measure twenty inches along its 
curve;” ibid., p. 234. ‘‘ Very general throughout the Upper Ludlow 
rock of Salop, Hereford, Radnor, &c.” Sil. Syst., p. 609. It occurs in 
the Malvern, Abberley, Woolhope, May Hill, Usk, and Builth Districts. 
M. G.S., vol. ii, part i., p. 228. 
