56 EXPLANATION OF THE PLATES. 
Fic. 3.—a, 6. TENTACULITES ORNATUS, Sowerby. 
Sil. Syst., p. 628, pl. xii., fig. 25. 
a. Original. Natural size ; in dark grey shale ; Wenlock rocks, Marloes Bay. 
Mus. G. 8. I. 
b. Original. Enlarged. 
Carapoc to WENLOCK.—Sil., 4th ed., p. 514. It abounds in the Dudley 
limestone ; zbid., p. 233. 
MOLLUSCA.— POL YZOA. 
Fig. 4.—a, b. PrILopictya LANCEOLATA, Goldfuss, sp. 
Sil. Syst., p. 676, pl. xv., fig. 11 a-e. 
a. Original. From a specimen in Wenlock limestone, Malverns. Mus. G. 
S. 1. 
b. Original. Portion of do. enlarged. 
Carapoc to LupLow.—Sil., 4th ed., p. 523. ‘‘ This species is abundant in 
Wenlock strata, accompanied by P. scalpellum, a branching species; the 
former occurs also in the Ludlow rocks.” Ibid., p. 217. Localities— 
Upper Silurian, Malverns, Shropshire ; Aymestry, Herefordshire ; Mont- 
gomeryshire. Cat. Brit. Foss., 2nd ed., p. 127. 
Fic. 5.—a, b. FENESTELLA SUBANTIQUA, D’ Orbigny. 
F. antiqua, Sil. Syst.,p. 678. FF. subantiqua, Sil., 4th ed., p. 523. 
Original. In Wenlock limestone, Dormington Wood. Mus. G. 8. I. 
Original. Portion of do. enlarged ; showing the net-work arrangement 
or fenestrules ; spaces between the radiating or longitudinal ribs, on 
which are situated the pores or cellules; and the connecting transverse 
partitions. 
Carapoc and WENLocK.—Sil., 4th ed., p. 523. Fenestella subantiqua and 
F. Milleri are common fossils at Dudley.” Jbid., p. 217. Upper Silurian, 
Dudley ; also in Denbighshire and Montgomeryshire. Cat. Brit. Foss., 
2nd ed., p. 124. Dormington Wood, Gloucestershire. Mus. G, 8. I. 
“8 
BRACHIOPODA. 
Fig. 6.—a, 6, c. OBotus Davipson1, Salter. 
British Silurian Brachiopoda, p. 58, and varieties transversus and Woodwardii ; 
ibid., pp. 59, 60. 
a, 6. Bivalve example and side view of do. in Wenlock shale, Dudley. From 
Brit. Sil. Brach., pl. iv., fig. 30. 
c. Internal cast of ventral valve from same plate, fig. 33 ; Wenlock shale, 
near Walsall. 
LLANDOVERY and Wentock.—Sil., 4th ed., p. 526. Wenlock shales, near 
Walsall, Dudley; Malvern and Ledbury; and Wenlock limestone, Ben- 
thall Edge. In Ireland it oceurs in decomposing Upper Silurian shales at 
Ferriter’s Cove, Dingle, Co. Kerry (Mus. G. 8S. I.). Var. transversus 
