PLATE XII. 
SILURIAN SPECIKS. 
ae ; 
10, Merestella > didyma, Dalman. Fig. 1, Woolhope Limestone, Hay Head. Sharpe 
Collection, Mus. Geol. Soc. Fig. 2, Wenlock Lime- 
stone, Dudley. Figs. 3, 4, 6, 7, 8, W. L., Falfield, 
Tortworth. (Figs. 3, 4, Mus. Geol. Survey, London.) 
Fig. 5, Aymestry Limestone, Sedgley, near Wolver- 
hampton. Fig. 9, internal cast enlarged. Dafaddfanchaf. 
near Llandeilo. Mus. Geol. Survey, London. Fig. 10, 
T. canalis, Sow., after original specimen (‘Sil. Syst.,’ 
pl. v, fig. 18); Lower Ludlow, near Uske. Mus. Geol. 
Soc., London. 
1] 
Lb. Athyris? depressa (Atrypa), Sow. Fig. 11, original specimen, ‘Sil. Syst.,’ 
pl. xii, fig. 6. Wenlock Shale, Stump’s Wood, Malverns. 
Mus. Geol. Soc. Figs. 12—14, from Woolhope Lime- 
stone; road between Alfrick and Crews Hill, Malverns. 
Mus. Geol. Survey, London. Figs. 13a, 4, c, enlarged 
figures. 
[6—1S. Athyris ? compressa (Atrypa), Sow. Fig. 16, original specimen (‘Sil. Syst.,’ 
pl. 13, fig. 5); Woolhope Limestone; Woodside and 
Nash, Presteign. Mus. Geol. Soe. Fig. 16, d, en- 
larged. Fig. 17, Dudley. Gray’s Collection, British 
Museum. Fig. 18, specimen alluded to by Mr. Geikie, 
at p. 6 of ‘Memoirs of Geol. Survey of Great Britain 
(32 Scotland),’ as from the Lower Ludlow beds, Hare 
Hall, Pentland Hill. Mus. Geol. Survey, London. 
). AMhyris ? obovata (Atrypa), Sow. The original specimen (‘Sil. Syst.,’ pl. viii, 
fig. 9); from Lower Ludlow beds, Mathon Edge, West 
flank of the Malverns. Mus. Geol. Soc. Fig. 19 ¢, d, 
enlarged. 
20. Meristella? Maclarceni, Haswell. Original specimen; Ludlow beds, Pentland 
Hills. Collection of Mr. Haswell. Figs. 20 a, 0, en- 
larged. 
25. Refzia Saltert, Dav. Figs. 21, 22, typical form; Wenlock Limestone ; Wenlock 
Edge. Mus. Geol. Survey, London. Figs. 23—25 
(= Rk. Baylei, Dav.); Wenlock Limestone, Benthal 
Kdge. 
20—30. ‘5 » var. Bouchard, Dav. Different variationsin shape. Fig. 26, a 
large transverse example; Wenlock Limestone, Benthall 
Edge. Collection of Dr. Holl. lig. 27, specimen 
showing portions of internal spiral coils. Fig. 28, the 
original specimen of &. Bouchard, Wenlock Limestone, 
Dudley. Fig. 28, enlarged figure. Fig. 29, another 
example, from Wenlock Limestone, Rock Farm, Long- 
hope. fig. 30, a very fine specimen from the same 
locality. 
