192 CATALOGUE OF PHANEROPNEUMONA. 
broadly truncate; suture slight, crenulate, the teeth being very 
minute and crowded on the upper whorls, collected into blunt 
bundles on the lower whorls; whorls remaining 4, scarcely 
convex, the last one shortly detached anteriorly, rounded be- 
neath; aperture perpendicular, ovate; peristome double; inner 
edge shortly expanded and affixed; outer edge spreading like 
a bell, marked with reddish-brown rays, raised above into the 
shape of a cap, then emarginated and affixed to the penulti- 
mate whorl. Operculum typical. Length 16, breadth 7 mill. 
Cyclostoma Grateloupi, Pfr. in Proc. Z. S. 1851; Je. n. 309, t. 40, 
f, 28-31. 
Cistula Grateloupi, Pfr. Consp. n. 402, p. 67; Pnewm. Mon. p. 272. 
B. Smaller, with the teeth of the suture crowded, sharp; length 
12, breadth 53 mill. 
Hab. Yucatan. 
25. CistutA LARGILLIERTI. 
Shell perforate, oblong, truncate, sculptured with crowded, sharply 
raised, longitudinal ribs, with the interstices decussated, under 
a lens, by spiral strize, fulvous, with indistinct series of fuscous 
spots; suture deep, denticulate; whorls remaining 4, convex, 
the last one shortly detached anteriorly; aperture perpendicu- 
lar, obliquely subovate; peristome double; inner edge simple, 
outer edge shortly expanded, with the margins angularly joined 
above. Operculum typical. Length 124, breadth 6 mill. 
Cyclostoma Largillierti, Pfr. in Z. f. If, 1846, p. 46; Jc. n. 125, 
p. 121, t. 14, f 26, 27. 
Choanopoma Largillierti, Gray, Cat. Cycl. p. 51, n. 14. 
Cistula Largillierti, Pfr. Consp. n. 403 ; Pnewm. Mon. p. 278. 
Hab. Yucatan. 
26. CistuLA ? FALLAX. 
Shell rimate, oblong-turreted, truncate, thin, decussated with 
blunt spiral ridges and more crowded longitudinal lines (the 
eighth or tenth of which appears stronger), not coarse, 
scarcely shining, whitish, painted with flexuous interrupted 
fulvous lines; spire rather convexly turreted; suture crenulate 
by minute bundles of striz ; whorls remaining 443, moderately 
convex, last rounded, painted with a fulvous band below the 
middle, widely detached anteriorly, scarcely spirally grooved 
beneath; aperture rather perpendicular, ovate; peristome white, 
double; inner edge slightly expanded, incumbent, outer edge 
narrow, rather equally spreading all round, angulated above. 
Length 14, breadth 63 mill. 
