100 GASTEROPODA. 



Cerithium ? muricato-costatum. Miinster, W. H. Hudleston, 

 G. M. dec. 2, ix (1882), pi. vi, f. 17, p. 250. Millepore Bed; 

 Scarborough. Leckenby Collection. 



C. muricatum (Sowerby), W. H. Hudleston, G. M. dec. 3, I (1884), 

 pi. iii, f. 2, p. 53. Dogger ; Blue Wyke. Leckenby Collection. 



C. muricatum (Sowerby) var. culleni, Leckenby, W. H. Hudle- 

 ston, G. M. dec. 3, I (1884), pi. iii, f. 5, p. 54. C. culleni, 

 J. Leckenby, Q. J. G. S. xv (1859), pi. iii, f. 13, p. 13. Kella- 

 ways Rock; the Castle Rock, Scarborough. Leckenby Col- 

 lection. 



C. muricatum (Sowerby) var. sexlineatum, W. H. Hudleston, 

 G. M. dec. 3, I (1884), pi. iii, f. 3, 3 a, p. 54. Dogger Sands; 

 Blue Wyke. Leckenby Collection. 



C. muricatum (Sowerby) var., W. H. Hudleston, G. M. dec. 3, 

 I (1884), pi. iii, f. 4, 4 a, p. 54. Cornbrash ; Scarborough. 

 Leckenby Collection. 



C. muricatum (Sowerby), extreme varieties, W. H. Hudleston, 

 G. M. dec. 3, I (1884), pi. iii, f. 7, 8, p. 55. Dogger Sands; 

 Blue Wyke. Leckenby Collection. 



C. tenuistriatum, v. Pyrgiscus tenuistriatus. 



C. vetustum (Phillips). " Chemnitzia " vetusta, W. H. Hudleston, 

 G. M. dec. 2, ix (1882), pi. vi, f. 9, 11, p. 248. Fig. 9, 

 Millepore Bed; Cloughton Wyke. Fig. 11, Dogger; Blue 

 Wyke. Leckenby Collection. 



C. vetustum (Phillips) var. seminudum, W. H. Hudleston, 

 Brit. Jurass. Gasterop. Inf. Ool. (1889), pi. viii, f. 7, p. 151. 

 " Chemnitzia " vetusta var. seminuda, W. H. Hudleston, G. M. 

 dec. 2, ix (1882), pi. vi, f. 13, p. 249. Dogger Series; Blue 

 Wyke. Leckenby Collection. 



C. vetustum (Phillips) var., W. H. Hudleston, Brit. Jur. Gasterop. 

 Inf. Ool. (1889), pi. viii, f. 5 d. "Chemnitzia" vetusta var.? 

 scalariformis, (Deslongchamps), W. H. Hudleston, G. M. dec. 

 2, IX (1882), pi. vi, f. 14, p. 249. Millepore Bed; Cloughton 

 Wyke. Leckenby Collection. There is some doubt as to 

 which of several specimens is the figured one. 



