LINGULID/. AD 
Builth district; &c. Mr. Lightbody has found the shell in the Upper Llandeilo beds west 
of Meadowtown. [Prof. Phillips states that Z. attenuata occurs under the Worcester 
Beacon ; at Storridge ; Cowley Park Obelisk, in the Malvern district ; and at Ankerdine 
Hill, Abberley district ; all these localities being in the “ Upper Caradoc ” (as it was then 
called) or Upper Llandovery rocks. Prof. M‘Coy mentions it from thin sandy (Bala) beds 
east of Nant-y-groes, south of Bala, North Wales. In Scotland it possibly occurs at 
Balclatchie, Girvan, Ayrshire ; but these are Caradoc beds, according to our best authori- 
ties. In Ireland it has been identified from the Llandovery slates of Kilbride, Cong, 
County Galway ; and General Portlock mentions Tyrone, Desertcreat. |’ 
In N. America it is stated by Prof. Hall to occur in great numbers about midway from 
the base to the top of the Trenton limestone, also at about fifty or sixty feet above the 
Birdseye limestone. 
Lineuna striata, Sow. PI. III, figs. 45—48. 
LINGULA sTRIATA, Sow. Sil. Syst., pl. viii, fig. 12,1839; and Siluria, pl. xx, fig. 7, 1859. 
Spec. Char. Squarish-ovate, longer than wide; sides slightly curved and sub- 
parallel; front gently convex, or nearly straight; posterior lateral margins sloping gra- 
dually, so as to form acuminate pointed beaks; valves very moderately convex and _flat- 
tened along the middle surface, marked by numerous fine, concentric, raised, undulating 
ridges or strize, with wider interspaces between them. Length 9, width 6 lines. 
Oés. The concentric undulating strize which ornament the surface of this species are 
exceedingly small, seventeen existing in the width of a line near the front, in Murchison’s 
original specimen, so that they can hardly be perceived except by the aid of a lens; 
the interspaces between these ridges are irregular in their respective widths. 
Position and Locality. L. striata has been found in the Lower Ludlow rock near 
Aymestry, also at Ledbury. It occurs likewise in the Wenlock shale, near Dudley. 
Mr. Lightbody states that near Ludlow the shell is peculiar to the upper beds of the 
Aymestry limestone; and that he has obtained it at Whitecliff, near Ludlow. 
Lineuna Symonpsu, Salter, ms. Pl. IIL, figs. 7—17. 
Spec. Char. Longitudinally oval or ovate, broadest about the middle, slightly tapering 
at the beaks, rounded in front; valves moderately and evenly convex, one valve a little 
more so than the other ; surface smooth, marked only with fine concentric lines of growth. 
A large example measured— 
Length 12, width 7 lines; but the shell is more often smaller. 
1 Mr. Salter tells me that these Irish determinations are erroneous; fragments of other species 
occurring instead. 
