116 



BRITISH SILURIAN BRACHIOPODA. 



Meristella Circe, Barrande (sp.)- PI- X, figs. 33 — 35. 



Terebeatula Circe, Barrande. Sil. Brach. Bohtn. ; Nat. Abhandl., vol. i, p. 3", pi. 

 xvi, fig. 6, 1847. 



— — Dav. Bull. Soc. Geol. Fr., 2nd ser., vol- v, p. 326, pi. iii, 



fig. 27, 1848. 



Spieigera — D'Orb. Prodrome, vol. i, p. 43, 1849. 

 Athyris — Salter. Siluria, 2nd edit., p. 542, 1859. 



? Spirigeea — Lindstrdm. Ofv. K. Vet. Akad. Forhandl., p. 361, 1860. 



Characters. Shell small, rhomboidal, longer than wide, greatest width about the 

 middle, from whence it gradually tapers to the extremity of a small incurved beak, and 

 anteriorly towards the front, which is much narrowed, and sometimes shghtly indented. 

 Valves almost equally and moderately convex, not often gibbous ; margin-line nearly 

 straight laterally, convex or curved in front. There is no real fold, but a small rounded 

 elevation occurs near and at the front of the dorsal valve, with sometimes a small groove 

 along the middle, and there is a corresponding depression or sinus in the ventral valve. 

 Surface smooth, marked only by concentric lines of growth. Shell-structure fibrous, 

 impunctate. Spiral processes attached to the hinge-plate of the dorsal valve. Two 

 specimens measured — 



Length 7, width 5, depth 4 lines. 

 „ 6, „ 5i „ 4 „ 



Ohs. The spiral processes in this species (or V9,riety) have been figured by Barrande 

 and by myself, in 1847 and 1848. 



Position and Locality. Meristella Circe occurs in the Wenlock Limestone of Dudley; 

 at Hay Head, and the Rushall Canal near Walsall ; in the Woolhope Limestone at Eastnor 

 Park, Malvern, &c. 



In Bohemia it was found by Barrande near Prague ; and Lindstrom thinks he has 

 obtained it at Gothland. 



Meristella ? Maclareni, Haswcll. PI. XII, fig. 20, a, b. 



Merista Maclareni, Ilaswell. Silurian Formation of the Pentland Hills, p. 30, 

 pi. ii, fig. 16, 1865. 



Spec. Char. Shell small, pentagonal, narrowed anteriorly, and slightly indented in 

 front. Ventral valve much deeper and more convex than the opposite one, and with an 

 angular sinus or sulcus extending along the middle. Beak pointed, much incurved over 

 the mnbone of dorsal valve, with sharply defined beak-ridges. No foramen visible. Dorsal 



