74 LAMELLIBRANCHIATA. 
Ctenodonta elongata, H. Hicks, in Salter, Cat. (1873), p. 24. 
Tremadoc Beds; Ramsey Island. This specimen cannot be 
found. 
C. hughesi, Salter, Cat. (1873), p. 82. Lower Llandovery; Sefin 
Llettyrhyddod, near Llandovery. 
C. levata (Hall). Nucula levata, Hall, F. McCoy, Brit. Palzeoz. 
Foss. (1852), pl. i kK, f. 4, 5, 5 a, p. 285. Bala Beds; Dinas 
Bran, Llangollen. The specimens cannot be identified with 
certainty. 
C. menapiensis, Hicks. C. rotunda, H. Hicks, in Salter, Cat. 
(1873), p. 24. Tremadoc Beds; Ramsey Island. This spe- 
cimen cannot be found. 
C. poststriata (Emmons). Nuculites poststriatus, F. McCoy, Brit. 
Palzeoz. Foss. (1852), pl. 1K, f. 6, p. 286. Denbighshire Flags ; 
Gwddelwern, Denbigh. 
C. rotunda, v. Ctenodonta menapiensis. 
C. subequalis, v. Arca subzequalis. 
C. sp. 1, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 
Fletcher Collection. 
C. sp. 2, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 
Fletcher Collection. 
C. sp. 8, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 
Fletcher Collection. 
C. sp. 4, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 
Fletcher Collection. 
Cucullea angusta, J. de C. Sowerby, Trans. Geol. Soc. ser. 2, V 
(1840), pl. lin, f 25. Upper Devonian ; Marwood. 
C. cancellata, Phillips, J. Morris and J. Lycett, Mollusca Gt. Ool. 
part 11 (1853), pl. xiv, f. 12, p. 182. Inferior Oolite (Grey Lime- 
stone); Cloughton, near Scarborough. Leckenby Collection. 
C. clathrata, J. Leckenby, Q. J. G. S. xv (1859), pl. ii, f. 4, p. 18. 
Kellaways Rock ; Scarborough. Leckenby Collection. 
Another specimen, J. Lycett, Supp. Mon. Moll. Gt. Ool. ete. 
(1863), pl. xxxix, f. 4, 4 a, p. 44. Cornbrash ; Scarborough. 
Leckenby Collection. 
