74 LAMELLIBRANCHIATA. 



Ctenodonta elongata, H. Hicks, in Salter, Cat. (1873), p. 24. 

 Trernadoc Beds; Ramsey Island. This specimen cannot be 

 found. 



C. hughesi, Salter, Cat. (1873), p. 82. Lower Llandovery ; Sefin 

 Llettyrhyddod, near Llandovery. 



C. levata (Hall). Niwula levata, Hall, F. McCoy, Brit. Palseoz. 

 Foss. (1852), pi. i K, f. 4, 5, 5 a, p. 285. Bala Beds; Dinas 

 Bran, Llangollen. The specimens cannot be identified with 

 certainty. 



C. menapiensls. Hicks. G. rotunda, H. Hicks, in Salter, Cat. 

 (1873), p. 24. Trernadoc Beds; Ramsey Island. This spe- 

 cimen cannot be found. 



C. poststriata (Emmons). Nucidites poststriatus, F. McCoy, Brit. 

 Palseoz. Foss. (1852), pi. i K, f. 6, p. 286. Denbighshire Flags; 

 Gwddelwern, Denbigh. 



G. rotunda, v. Ctenodonta menapiensis. 



G. subcequalis, v. Area subsequalis. 



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. 3, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 

 Fletcher Collection. 



C. sp. 4, Salter, Cat. (1873), p. 152. Wenlock Limestone; Dudley. 

 Fletcher Collection. 



Cucullsea angusta, J. de C. Sowerby, Trans. Geol. Soc. ser. 2, v 

 (1840), pi. liii, f. 25. Upper Devonian ; Marwood. 



C. cancellata, Phillips, J. Morris and J. Lycett, MoUusca Gt. Ool. 

 part ii (1853), pi. xiv, f. 12, p. 132. Inferior Oolite (Orey Lime- 

 stone); Cloughton, near Scarborough. Leckenby Collection. 



C. clathrata, J. Leckenby, Q. J. G. S. xv (1859), pi. iii, f. 4, p. 13. 

 Kellaways Rock ; Scarborough. Leckenby Collection. 



Another specimen, J. Lycett, Supp. Mon. Moll. Gt. Ool. etc. 

 (1863), pi. xxxix, f. 4, 4 a, p. 44. Gornbrash ; Scarborough. 

 Leckenby Collection. 



