CYCLOPHORIDA. 183 
painted with narrow, interrupted, chestnut-coloured bands; spire 
conic, not truncate; whorls 53, convex, last rounded, shortly de- 
tached anteriorly, keeled above; umbilicus narrow, open, pervi- 
ous; aperture scarcely oblique, angularly ovate; peristome conti- 
nuous, with the margins joined above into an angle,rather double ; 
inner edge slightly expanded, affixed, outer edge almost equally 
dilated all round, spreading horizontally, slightly auriculated 
above. Operculum typical. Length 11, breadth 73 mill. 
Cyclostoma catenatum, Gould, in Proc. Bost. Soc. 1843, p. 188; 
Jay, Catal. 1850, p. 254, n. 5827. 
Cyclostoma interruptum, Gould, in Bost. Journ. iv. p. 494. 
Cyclostoma limbiferum, Menke, MSS.; Pfr. in Z. f. M. 1846, p. 45; 
Ic. n. 38, p. 46, t. 6, f. 11, 12, t. 21, f. 6. 
Chondropoma ? limbiferum, Pfr. in Z. f. M. 1847, p. 109, n. 4; 
Gray, Cat. Cycl. p. 55, n. 1. 
Choanopoma semiproductum, Gray, Cat. Cyel. p. 54, n. 29. 
Cistula limbifera, Pfr. Consp. n. 381. 
Cistula catenata, Pfr. Pnewm. Mon. p. 261. 
B. Larger, length 16, breadth 9 mill. (Pfr. Jc. t. 38, f. 3, 4) 
Hab. Cuba. 
3. CistuLA AGASSIZII. 
Shell globose-turbinate, rather solid, silk-shining, reddish, sculp- 
tured with raised spiral ridges, which are smaller alternatingly, 
the stronger ones being aspersed with chestnut-coloured points ; 
spire conic, not truncate; suture slightly channelled; whorls 6, 
convex, painted usually with distant white points along the 
suture, the last one shortly detached anteriorly, sculptured with 
equal ridges beneath, distinctly decussated within the middle- 
sized umbilicus; aperture perpendicular, ovate; peristome con- 
tinuous, angulated above, shortly sinuately indented on the 
penultimate whorl, with the margins slightly expanded. Oper- 
culum like that of C. catenata. Length 13, breadth 7 mill. 
Cyclostoma Agassizii, Charpentier, MSS.; Pfr. Ic. n. 274, t. 38, 
“ee 
Cistula Agassizii, Pfr. Consp. n. 382; Pneum. Mon. p. 262. 
Hab. Cuba. 
4, CISTULA PLEUROPHORA. 
Shell globose-turbinate, thin, sculptured with crowded longitu- 
dinal strize and more prominent thread-like ribs, diaphanous, 
slightly shining, whitish-fulvous ; spire turbinate, with the apex 
rather pointed, horny; suture denticulated by the prominent 
ribs; whorls 5, convex, the last one roundish, shortly detached 
anteriorly; umbilicus middle-sized, deep, surrounded with a 
keel-like angle; aperture rather perpendicular, ovate-circular ; 
