90 LAMELLIBRANCHIATA. 
Pterinea retroflexa (Wahlenberg) var. a, F. McCoy, Brit. 
Palseoz. Foss. (1852), p. 262. <Aymestry Limestone; Leint- 
wardine. 
P. retrofiexa (Wahlenberg) var., (cf. Avicula erecta, Conrad), F. 
McCoy, Brit. Paleeoz. Foss. (1852), p. 262. Upper Ludlow; 
Laverock Lane, Kendal. 
P. retroflexa (Wahlenberg) var., (with coarse imbrications), 
Salter, Cat. (1873), p. 150. Wenlock Limestone; Dudley. 
Fletcher Collection. 
P. sowerbyi, F. McCoy, Brit. Palsoz. Foss. (1852), p. 265. 
Aymestry Limestone; Leintwardine. 
P. subfalcata (Conrad), F. McCoy, Brit. Paleeoz. Foss. (1852), 
pl. it f. 3, 3 a, p. 268. Coniston Grit; Howgill Fell, near 
Sedbergh. 
P. subradiata (Sowerby). Avicula subradiata, J. de C. Sowerby. 
Trans. Geol. Soc. ser. 2, v (1840), pl. liv, £1. Upper Devonian; 
South Petherwin. 
P. tenuistriata, F. McCoy, A. M. N. H. ser. 2, vit (1851), p. 62, 
and Contrib. Brit. Pal. (1854), p. 197, and Brit. Paleeoz. Foss. 
(1852), pL it, f.4,4 a, p. 263. Upper Ludlow ; Benson Knot, 
Kendal. 
P. sp., (cf. lineatula), Salter, Cat. (1873), p. 150. Wenlock Shale 
(or Lower Ludlow); Dudley. Fletcher Collection. 
Pteronites persulcatus, F. McCoy, A. M. N. H. ser. 2, vir (1851), 
p. 170, and Contrib. Brit. Pal. (1854), p. 202, and Brit. Paleoz. 
Foss. (1855), pl. iii F, f 1, p. 480. Carboniferous Limestone ; 
Lowick. 
Pteroperna plana, J. Morris and J. Lycett, Mollusca Gt. Ool. 
part 11 (1853), pl. xiv, f. 4, p. 128. Inferior Oolite (Grey Lame- 
stone); Cloughton, near Scarborough. Leckenby Collection. 
Pullastra antiqua, v. Nucula pullastriformis. 
Quenstedtia levigata (Phillips), J. Morris and J. Lycett, 
Mollusca Gt. Ool. part ii (1853), pl. xiv, f. 18, p. 135. Grey 
Limestone; Cloughton Wyke, near Scarborough. Leckenby 
Collection. 
