292 BRITISri SILURIAN BRACHIOPODA. 



Position and Locality. In ' Siluria' St.fimiculata\s, restricted to the Llandovery and 

 Wenlock periods. I am acquainted with the shell from the latter formation only. It is 

 an abundant fossil at Dudley, Wenlock Edge, Benthall Edge, Lincoln Hill, &c. It also 

 occurs in several localities, enumerated by Philhps and Salter, in the Malvern, Abberley, 

 Woolhope, Usk, and Llandeilo districts \ and it has been found at Moel Fodig in North 

 Wales. 



In Ireland it is found at Ferriter's Cove, Doonquin, Dingle, County Kerry. 



Abroad it occurs in Gothland, Norway, Bohemia, &c. 



Strgphomena Dayi, Dav. PI. XLI, fig. 7. 



Spec. Char. Shell small, semicircular, wider than long, broadest at the hinge-line, 

 with sn)all mucronate wings ; slightly narrowing anteriorly ; front rounded. Ventral 

 valve slightly convex, flattened at the wings ; hinge-area narrow ; fissure small, covered 

 with a pseudo-deltidium ; beak very small, scarcely projecting. Dorsal valve slightly 

 concave, flattened near the cardinal extremities ; hinge-area linear. Surface of both 

 valves ornamented with about thirteen (principal) thread-like radii, with very wide 

 interspaces finely striated longitudinally. The middle of the interspace is usually 

 occupied by a rather stronger rib, but not so wide as the principal ones. Interior not 

 known. 



Length 5, width 6, depth 1 line. 



Ohs. Two well-preserved examples of this small species were found by the Rev. H. 

 E. Day in Wenlock Shale at Buildwas, near Wenlock. It is remarkable for the very 

 slight convexity and concavity of its valves, as well as by its striation. I have named the 

 shell after its discoverer, to whom I am indebted for the liberal loan of many valuable 

 specimens from his collection. 



Strophomena deltoidea, Conrad. PL XLII, figs. 1 — 5 ; and PL XXXIX, fig. 22. 



LepTjENa deltoidea, Conrad. Ann. Geol. Report, p. 115, 1838. 

 Strophomena — Id. Ibid., p. 64, 1839 ; and p. 37, 1841. 



— — Fanuxem. Geol. Report, p. 46, fig. 2, 1842. 



— — Emmons. Geol. Report, p. 389, fig. 2, 1842. 



Lept^na — Be Verneuil. Geol. Russia, vol. ii, p. 222, pi. xiv, fig. 5, 1845. 



Leptagonia plicotis, M'Cotj. Sil. Foss. Ireland, p. 25, pi. iii, fig. 5, 1846. 

 Lept^na semiovalis, Id. Ibid., p. 26, pi. iii, fig. 6, 1846. 

 Oetiiis suBL^vis, Id. Ibid., p. 35, pi. iii, fig. 19, 1846. 



