EXPLANATION OF THE PLATES. 59 
a,b. Original. Two views of the same shell; Wenlock limestone, Wenlock 
Edge. Mus. G. S$. I. 
LLANDOVERY to LupLtow.—Sil., 4th ed., p. 525. “ Meristella tumida is a 
common shell in the Wenlock limestone of Dudley, Woolhope, Benthall 
Edge, near Walsall, May Hill, &c. In addition, various localities in 
Wenlock limestone, Lower Ludlow, and Aymestry limestone of the Mal- 
vern, Abberley, May Hill, Usk, and Llandeilo districts are-given in Mem. 
Geol. Surv., vol ii., part i., p. 279. In Scotland it has been found in the 
Wenlock shales of the Pentland Hills.” Brit. Sil. Brach., p. 111. In 
Ireland it has been collected by the Geol. Survey in Wenlock shales at 
Ferriter’s Cove S. and Clogher, Co. Kerry ; also at Kilbride, Cong, Co. 
Galway. 
Fig. 4.—a, b. ATRYPA RETICULARIS, Linneus, sp. 
A. affinis and A. aspera, Sil. Syst., pp. 614 and 623. Sil., 4th ed., pl. xxi., 
figs. 12, 13. 
a, b. ‘Two views of the same shell. From Brit. Sil.Brach., pl. xiv., fig. 7 a, 
Wenlock limestone, Dudley. 
Lower Lianpovery to Upper Devontan.—‘ This fossil has the greatest 
range known of any Paleozoic shell; it is particularly abundant in the 
Llandovery and Wenlock rocks. In England it is plentiful in the Wen- 
lock limestone and shales at Dudley, Wenlock Edge, and Walsall; in 
various localities in the Malvern, Woolhope, May Hill, Usk, Llandeilo, 
and Marloes districts, as recorded in Mem. Geol. Surv., vol. ii., part i., 
p- 278. It is not uncommon in the Upper and Lower Ludlow rocks, and 
abounds of large size in the Aymestry limestone. It also occurs in the 
Woolhope limestone at Littlehope ; in the Upper Llandovery sandstone of 
May Hill and Huntley Hill; at the Hollies Farm, Shropshire ; and in all 
the Lower Llandovery grits and shales of South Wales. In Scotland it is 
common in the Wenlock shales of the Pentland Hills and in various loca- 
lities in the Girvan district, Ayrshire, in Upper and Lower Llandovery 
rocks. In Ireland it occurs at Ferriter’s Cove and several other localities in 
the Dingle district, Co. Kerry ; in beds of Wenlock and Ludlow age.” Brit. 
Sil. Brach., pp. 132,35. It has also been collected by the Geological 
Survey from Wenlock rocks at Kilbride, Co. Galway. 
Fig. 5.—a, 6. PENTAMERUS GALEATUS, Dalman, sp. 
Atrypa galeata, Sil. Syst., p. 623. P. galeatus, Sil., 4th ed., pl. xxi., figs, 
Bae 
a. View showing both valves. From unpublished plate Geol. Survey; Wen- 
lock limestone, Dudley. 
b. Longitudinal section; showing the position of the internal plates. From 
the same engraving. 
WENLOCK anp LupLow.—Sil., 4th ed., p. 527. ‘+ The vertical range and 
geographical distribution of Pentamerus galeatus is very considerable ; 
for itis common to the Wenlock, Widdle Ludlow, and Devonian forma- 
tions. It abounds in the Wenlock limestone and Upper Wenlock shales 
near Walsall and Dudley.” Brit. Sil. Brach., p. 147. In the Mem. 
Geol. Surv., vol. ii., part i., pp. 291, 2. Many localities for this species 
are given in Wenlock limestone and shale of the Malvern, Abberley, Wool- 
