BRACHIOPODA. 57 
Orthis michelini? (L’Eveillc), T. Davidson, Brit. Foss. Brach. 1, 
part v (1861), pl. xxx, f. 12, p. 132. Carboniferous Limestone ; 
Settle. Burrow Collection. 
O. pecten, v. Strophomena pecten. 
O. persarmentosa, v. Streptorhynchus persarmentosus. 
O. porcata, F. McCoy, Brit. Palzeoz. Foss. (1852), pl.1 H, f. 41 a—e, 
42, 42 a, p. 223. T. Davidson, Brit. Foss. Brach. 1, part vil 
(1869), pl. xxxi, f. 15, p. 250. Coniston Limestone ; Coniston. 
O. retrorsistria, F. McCoy, A. M. N. H. ser. 2, vir (1851), p. 396, 
and Contrib. Brit. Pal. (1854), p. 218, and Brit. Palzeoz. Foss. 
(1852), pl. i uw, f. 12—14, p. 224. T. Davidson, Brit. Foss. 
Brach. v (1883), pl. xiv, f. 7—16 (f. 8 and 14 missing), p. 185. 
O. alternata, Salter (non Sowerby), Cat. (1873), p. 60. O. 
alternata var. retrorsistria, T. Davidson, Brit. Foss. Brach. 
I, part vii (1869), pl. xxxvi, f. 39—42, p. 265. Middle Bala ; 
Cerrig-y-Driidion, Hafod Evan, Pen-y-Gaer, Pentre Cwmdu. 
O. sagittifera, F. McCoy, A. M. N. H. ser. 2, vit (1851), p. 398, 
and Contrib. Brit. Pal. (1854), p. 220, and Brit. Palseoz. Foss. 
(1852), pl. i uw, f. 15-19, p. 227. T. Davidson, Brit. Foss. 
Brach. II, part vii (1869), pl. xxxvi, f. 18—21, p. 260. Bala 
Beds ; Aber Hirnant. 
O. sarmentosa, F. McCoy, Brit. Palieoz. Foss. (1852), pl. 1 4, 
f, 25—28, p. 227. 'T. Davidson, Brit. Foss. Brach. 11, part vii 
(1869), pl. xxxvi, f. 35—38, p. 262, and abid. Vv (1883), p. 189. 
Orthis testudinaria, Dalman, Salter, Cat. (1873), p. 60. 
Middle Bala; Llyn Oquwen. 
O.? spiriferoides (McCoy). Strophomena spiriferoides, F. McCoy, 
A. M. N. H. ser. 2, vit (1851), p. 402, and Contrib. Brit. Pal. 
(1854), p. 224, and [Leptcena] Brit. Paleeoz. Foss. (1852), p. 246, 
woodcuts. Bala Beds; Moel-y-Garth, Welshpool, Horderley, 
Allt-yr-Anker, ete. 
O. turgida, F. McCoy, A. M. N. H. ser. 2, vir (1851), p. 399, and 
Contrib. Brit. Pal. (1854), p. 221, and Brit. Palzoz. Foss. 
(1852), pl. i H, f. 20, 20 a (Llandeilo), 21 (Golden Grove), 
22 (Craig-y-Beri), 23, 24 (Conway Falls), p. 229. T. Davidson, 
Brit.. Koss: Brach. v (1883), pl. xiv,,f 17, 19; 19 a, 20, 20 a, 
