PLATE V. 
“SILURIAN SPECIES. 
Fie. 
1—6. Obolus Davidsoni, var. transversus, Salter. Figs 1, 2, flattened impressions in 
Wenlock shale from Parker’s Hall, near Dudley. | Fig. 1, 
in Mus. Geol. Survey, London. Fig. 3, impression, from 
same locality, showing on its surface numerous indentations 
produced by small spines. Collection of Mr. Mushen. ~ 
Fig. 4, a large cast from same locality; in the collection 
of Mr. L. P. Capewell. Fig. 5, cast of one valve uncom- 
pressed. Fig. 6, internal cast, from Rushall Canal, Walsall. 
Collection of Mr. Mushen. This shell occurs also in the 
Wenlock limestone, but not so abundantly as in the shales. 
Loess or ‘. + var. Voodwardu, Salter. Fig. 7, a fragment, labelled O. 
Woodwardii in Mus. Geol. Survey, London; from Wenlock 
limestone, Dormington Wood, Woolhope. Fig. 8, another 
specimen in the same Museum, from Wenlock shales, near 
Dudley. 
9—18. Discina rugata, Sow. Figs. 9, 10, after original figures (‘ Sil. Syst.,’ pl. v, fig. 
11), Upper Ludlow, Ludlow; Mus. Geol. Soc. Fig. 11, 
attached valve, Upper Ludlow, Whitecliff Ludlow. Fig. 
12, Lower Ludlow, Church Hill. Collection of Mr. Light- 
body. Fig. 13, a finely preserved upper valve, from Upper 
Ludlow, Sunnybank, near Ludlow. Fig. 14, Upper Ludlow, 
Combe Hill; Mus. Geol. Survey, London. Fig. 15, Upper 
Ludlow, Delbury ; Mus. Geol. Soc. Fig. 16, near Ludlow. 
Fig. 17, Ludlow. Fig. 18, Wenlock shale, Parker’s Hall, 
near Dudley. Collection of Mr. L. P. Capewell. 
19—24. ,, perrugata,M‘Coy. Fig 19, after original figure (‘Synopsis Sil. Foss. 
Ireland, pl. ii, fig. 2), from sandstone, Kilbride, Cong, 
County Galway. Collection of Sir R. Griffith. Fig. 20, 
from Caradoc beds, Chair of Kildare; Mus. Geol. Survey, 
London. Fig. 21, a large flattened impression, from Caradoc 
beds, Desertcreat, ‘'yrone; same Museum. Fig. 22, Upper 
Llandovery beds?, Penlan, near Llandovery. Collection of 
Mr. Wyatt-Edgell. Fig. 23, from Balceltchie, Girvan Valley, 
Ayrshire. 
