BRACHIOPODA. 57 



Orthis michelini ? (L'Eveille), T. Davidson, Brit. Foss. Brach. n, 

 part v (1861), pi. xxx, f. 12, p. 132. Carboniferous Limestone ; 

 Settle. Burrow Collection. 



0. pecten, v. Strophomena pecten. 



0. persarmentosa, v. Streptorhynchus persarmentosus. 



O. porcata, F. McCoy, Brit. Palseoz. Foss. (1852), pi. i H, f. 41 a c, 

 42, 42 a, p. 223. T. Davidson, Brit. Foss. Brach. in, part vii 

 (1869), pi. xxxi, f. 15, p. 250. Coniston Limestone; Coniston. 



O. retrorsistria, F. McCoy, A. M. N. H. ser. 2, vm (1851), p. 396, 

 and Contrib. Brit. Pal. (1854), p. 218, and Brit. Palgeoz. Foss. 

 (1852), pi. i H, f. 1214, p. 224. T. Davidson, Brit. Foss. 

 Brach. v (1883), pi. xiv, f. 716 (f. 8 and 14 missing), p. 185. 

 0. alternate, Salter (rum Sowerby), Cat. (1873), p. 60. 0. 

 alternata var. retrorsistria, T. Davidson, Brit. Foss. Brach. 

 in, part vii (1869), pi. xxxvi, f. 3942, p. 265. Middle Bala ; 

 Gerrig-y-Druidion, Hafod Evan, Pen-y-Oaer, Pentre Cwmdu. 



O. sagittifera, F. McCoy, A. M. N. H. ser. 2, vm (1851), p. 398, 

 and Contrib. Brit. Pal. (1854), p. 220, and Brit. Palaeoz. Foss. 

 (1852), pi. i H, f. 1519, p. 227. T. Davidson, Brit. Foss. 

 Brach. in, part vii (1869), pi. xxxvi, f. 1821, p. 260. Bala 

 Beds; Aber Hirnant. 



O. sarmentosa, F. McCoy, Brit. Palseoz. Foss. (1852), pi. i H, 

 f. 2528, p. 227. T. Davidson, Brit. Foss. Brach. in, part vii 

 (1869), pi. xxxvi, f. 3538, p. 262, and ibid, v (1883), p. 189. 

 Orthis testudinaria, Dalman, Salter, Cat. (1873), p. 60. 

 Middle Bala; Llyn Ogwen. 



O. ? spiriferoides (McCoy). Strophomena spiriferoides, F. McCoy, 

 A. M. N. H. ser. 2, vm (1851), p. 402, and Contrib. Brit. Pal. 

 (1854), p. 224, and [Leptcena] Brit. Palseoz. Foss. (1852), p. 246, 

 woodcuts. Bala Beds; Moel-y-Qarth, Welshpool, Horderley, 

 Allt-yr- Anker, etc. 



O. turgida, F. McCoy, A. M. N. H. ser. 2, vm (1851), p. 399, and 

 Contrib. Brit. Pal. (1854), p. 221, and Brit. Palssoz. Foss. 

 (1852), pi. i H, f. 20, 20 a (Llandeilo), 21 (Golden Grove), 

 22 (Craig-y-Beri), 23, 24 (Conway Falls), p. 229. T. Davidson, 

 Brit. Foss. Brach. v (1883), pi. xiv, f. 17, 19, 19 a, 20, 20 a, 



