170 CATALOGUE OF PHANEROPNEUMONA. 
Cyclostoma Dominicense, Pfr. in Z. f. M. 1850, p. 79; Lc. n. 277, 
t. 38, f. 9-10. 
Cyclostomus Dominicensis, Pfr. Consp.n. 354; Pneum. Mon. p. 242. 
Hab. Haiti (Mr. Sallé). 
XXII. TUDORA. 
Operculum ovate, shelly, flat, of few whorls, which enlarge rapidly 
and are arcuately grooved or deeply striated obliquely, with 
the nucleus very eccentrical. Shell ovate-oblong or turreted ; 
aperture angularly ovate; peristome expanded, simple or 
double. 
Tudora, Gray, Catal. Cycloph. p. 48; Pfr. in Z. f. M. 1851, p. 166; 
Consp. p. 38; Pnewn. Mon. p. 248. 
Cistula, sp., Gray. 
Cyclostoma sp., Awzett. 
A..Peristome simple «210 (Sos) te Ga 
B. Peristome indistinctly doubled » §2. ,, 12-14. 
C. Peristome double ‘ : §3 
§ 1. Peristome simple. 
1. TupORA MEGACHIBA. B. M. 
Shell perforated, ovate-conic, truncated, sculptured with rather 
distant spiral ridges, crossed by raised longitudinal lines, 
marbled with brown, reddish, and orange; whorls remaining 5, 
convex, last somewhat ascending anteriorly; aperture nearly 
perpendicular, its base being slightly produced beyond the axis, 
ovate, saffron-coloured within; peristome simple, white, almost 
continuous, angularly dilated above, with the right margin 
expanded ; left margin much dilated, expanded, more or less 
covering the narrow perforation. Operculum arcuately striated. 
Length 18, breadth 9 mill. 
Cyclostoma megacheilos, Pot. d& Mich. Gal. Douai, i. p. 237, t. 24, 
f. 9-10. 
Cyclostoma simile, Gray, MSS. Mus. Br.; Sow. Thes. n. 37, p. 103, 
t. 24, £. 48, 49. 
Cyclostoma megachilum, Pfr. Jc. n. 62, p. 66, t. 9, f. 18, 19. 
Cyclostoma roridum, Parr. in Sched. 
Cyclostoma Proteus, Beck, ASS. 
Tudora similis, Gray, Cat. Cycl. p. 48, n. 1. 
Tudora megachila, Pfr. Consp. n. 355; Pneum. Mon. p. 243. 
8. Larger ; with the aperture whitish within. 
Cyclostoma cancellatum, Menke, MSS. (Pfr. Ic. t. 9, f. 15-17.) 
