100 GASTEROPODA. 
Cerithium? muricato-costatum, Miinster, W. H. Hudleston, 
G. M. dec. 2, rx (1882), pl. vi, f. 17, p. 250. Mullepore Bed ; 
Scarborough. Leckenby Collection. 
C. muricatum (Sowerby), W. H. Hudleston, G. M. dee. 3, 1 (1884), 
pl. iii, f. 2, p. 53. Dogger; Blue Wyke. Leckenby Collection. 
©. muricatum (Sowerby) var. culleni, Leckenby, W. H. Hudle- 
ston, G. M. dec. 3, 1 (1884), pl. iu, f. 5, p. 54. C. cullen, 
J. Leckenby, Q. J. G. 8S. xv (1859), pl. iu, 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, 1 (1884), pl. ii, f 3,3 a, p. 54. Dogger Sands ; 
Blue Wyke. Leckenby Collection. 
Cc. muricatum (Sowerby) var., W. H. Hudleston, G. M. dec. 3, 
1 (1884), pl. iti, f 4, 4 a, p. 54. Cornbrash ; Scarborough. 
Leckenby Collection. 
C. muricatum (Sowerby), extreme varieties, W. H. Hudleston, 
G. M. dec. 3, 1 (1884), pl. ii, f 7, 8, p. 55. Dogger Sands ; 
Blue Wyke. Leckenby Collection. 
C. tenwistriatum, v. Pyrgiscus tenuistriatus. 
C. vetustum (Phillips). “ Chemnitzia” vetusta, W. H. Hudleston, 
G. "M. ‘dec. 2, Tx (1882), pl. vi, £9, U1, p.- 246s pee 
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), pl. viii, fi 7, p. 151. 
“ Chemnitzia” vetusta var. seminuda, W. H. Hudleston, G. M. 
dec. 2, Ix (1882), pl. vi, f 13, p. 249. Dogger Series; Blue 
Wyke. Leckenby Collection. 
C. vetustum (Phillips) var., W. H. Hudleston, Brit. Jur. Gasterop. 
Inf. Ool. (1889), pl. viii, f. 5 d. “Chemnitzia” vetusta var. ? 
scalariformis, (Deslongchamps), W. H. Hudleston, G. M. dee. 
2, Ix (1882), pl. vi, f. 14, p. 249. Muillepore Bed ; Cloughton 
Wyke. Leckenby Collection. There is some doubt as to 
which of several specimens is the figured one. 
