4A, BRITISH SILURIAN BRACHIOPODA. 
? Lineuta Brcuet, Salter, MS. PI. I, figs. 12—13. 
Spec. Char. Shell much elongated, depressed ; sides sub-parallel for some distance, 
or gradually tapering from near the front to the beak; front slightly rounded or almost - 
straight ; surface marked with numerous fine, undulating, small, concentric lines of growth, 
which at intervals are more deeply indented, and crossed by very fine radiating lines. 
‘T'wo specimens measured— 
Length 17, width 9 lines. 
Sat ca os-.. 0 wee 
Obs. I have already stated that, if this shell is not ZL. Lesweurt, or a variety of 
it, it is a very closely allied form; but I have provisionally retained Mr. Salter’s varietal 
or specific designation of Bechet, since he considers the two to be quite distinct. 
Position and Locality. Upper Llandovery, Marloes Bay. 
Lineu.a attenuata, Sow. PI. III, figs. 18—27. 
Linevuta attenuata, Sow. Silurian System, pl. xxii, fig. 13, 1839; and Siluria, 
pl. y, fig. 16, 1859. 
[— _ Portlock. Report on the Geology of Londonderry, &c., p. 443, 
pl. xxx, fig. 4, 1843 7] 
[— — M‘Coy. Synopsis Sil. Foss. Ireland, p. 24, 1846 ?] 
[— — J. Hall. Paleont. New York, vol. i, p. 94, pl. xxx, fig. 1, 
1847 7] 
— a M‘Coy. British Pal. Foss., p. 251, 1852. 
— curTa Jf‘Coy (not of Conrad), ibid., p. 251, 1852. 
Spec. Char. Ovate-acute, longer than wide, sharply acuminated posteriorly or towards 
the beaks ; anteriorly the sides and front are very much rounded ; valves slightly convex ; 
surface marked with numerous concentric lines of growth, which at irregular intervals are 
more deeply indented. A large example measured— 
Length 9, width 63 lines. 
Obs. ‘This shell varies in the degree of acumination of its posterior portion or beak, 
the sides being more sub-parallel in some examples than in others. Prof. M‘Coy states 
that it is, perhaps, more allied to Z. ovata, M‘Coy; but it really does not much resemble 
it, bemg considerably shorter and wider, with longer posterior lateral margins, besides 
being very much smaller; and these differences become greater as specimens of the two 
species approach each other in size. 
Position and Locality. It occurs in the Llandeilo flags only, according to Mr. Salter. 
Very characteristic examples are found in the Llandeilo flags of Llandeilo and Shelve ; also 
at Coed Sion, Llangadoc ; Middleton, east of Chirbury; Rorington, Salop; Carneddau, 
