290 BRITISH SILURIAN BRACHIOPODA. 



In Ireland at Ferriter's Cove, Dingle, County Kerry, &c. I do not know the shell 

 from Scotland. 



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



Strophomena Walmstedti, Lindstrom. PI. XL, figs. 6 — 8. 



Strophomena Walmstedti, Zm«?«^?-o)w. Proc. Roy. Acad. Stockholm, pi. xiii, fig. 16, 



1860. 

 — — Bav. Trans. Geol. Soc. Glasgow, Pal. Ser., vol. i, p. 18, 



pi. iii, figs. 5 and 6, 1868. 



Spec. Char. Shell elongated semicircular in shape, concavo-convex, flattened at 

 the ears, its greatest breadth at the hinge-line, with mucronate wings ; ventral 

 valve convex, sometimes gibbous, with a narrow sub-parallel area, and small pseudo- 

 deltidium in the middle ; dorsal valve concave, following the curves of the ventral valve ; 

 area linear ; surface of both valves covered with thread-like longitudinal ribs, while four or 

 five finer striae occupy the interspaces between each pair of the larger ones. The surface 

 is also irregularly and coarsely wrinkled, especially so on the posterior half of the valves. 

 Length 21, width 20 lines. 



Obs. Strophomena Wahndedti is easily distinguished from St. euglypha by the shape 

 of its valves, which are not geniculated as in the last-named shell. Only a few incomplete 

 internal casts, showing the internal character, have been hitherto discovered. The 

 muscular impressions in the ventral valve are not unlike those of St. euglypha ; but some 

 small differences are noticeable in the dorsal valve. 



Position and Locality. The first British specimen (cast) of this species was found by 

 myself, during a visit to the North Esk, in the Pentland Hills, and more complete 

 examples were subsequently obtained by Messrs. Henderson and Brown. It occurs there 

 in bed " D," which has been attributed to the Wenlock series ; and, according to Prof. 

 Lindstrom, the British form entirely agrees with similar specimens found by him in 

 Gothland. In Great Britain it has been hitherto obtained only in the condition of casts. 



Stkophomena ruNicuLATA, M'CoT/. PI. XL, figs, 9 — 13. 



Orthis FUNicuLATA, M'Coy. Sil. Foss, Ireland, p. 30, pi. iii, fig. 11, 1846. 

 Lept^na — Bav. Lond. Geol. Journ., vol. i, p. 57, pi. 12, figs. 5—8. 1847; 

 and Bull. Soc. Geol. France, s6r. 2, vol, v. p. 317, fig. 5, 

 1848. 

 — — Be Verneidl Ibid., p. 347, 1848. 



