CYCLOSTOMUS 8$. 9. 10. 233 
70. €. Chevalieri Adams. 7 383 
T. perforata, ovato-conica, laevigata, nitida, fusca, apice 
obscurior, juxta suturam et circa umbilicum alba, seriebus 
macularum saturate brunnearum picta; spira convexiuscula, 
truncata, amissis plus quam 2 anfractibus; anfr. superst. circa 
4 convexi; sutura modice depressa; apertura fere circularis; 
perist. internum imperfectum, externum album, laevigatum, 
late expansum (praecipue superne et latere sinistro), ad anfr. 
penultimum bene appressum. — Operc. simile operculo C. a/i, 
subspirale, striis obliquis. — Diverg. media circa 45*; long. 
0,68; lat. max. 0,48; lat. min. 0,35 poll. (Ad.) 
Cyclostoma Chevalieri -4dams Contrib, to Conchol. N. 9. p. 155. *) 
Cuclostomus Chevalieri Pfr. Consp. N. 342. 
Habitat in insula Jamaica. 
$. 10. 
71. €. thysanorhaphe Sowerby. 384 
T. perforata, oblongo-conica, decollata, longitudinaliter 
confertim plicato-striata, sericina, albida, fusco-castaneo inter- 
rupte fasciata et strigata; anfr. superst. 4 convexi, regulariter 
accrescentes, ultimus basi subproductus; sutura crenis majus- 
culis albis munita; apertura subverticalis, subangulato - rotun- 
data; perist. duplicatum : internum continuum, breviter porrec- 
tum, externum campanulato-expansum, album, rufulo-radiatum, 
ad anfractum penultimum interruptum, superne et ad umbili- 
cum in auriculas sinuosas, inflexas dilatatum. — Operc. C. 
Humphregyani. — Long. l8, diam. 10 mill Ap. 6'/, mill. 
longa. (Coll. Nr. 159.) 
Cyclostoma thysanorhaphe Sow. 'Thes. N. 145. p. 143. t 28. f. 162 163. **) 
*) Shell ovate conie: brown, darker at the summit, white along the 
suture, around the umbilicus, and with the peritreme white; also with seve- 
ral spiral series of dark brown dots, of which series two on the upper 
whorls and three on the last are more conspicuous: smooth and shining: 
spire rather convex, truncated with the loss of more than two whorls; about 
four whorls remaining, which are quite convex, with a moderately depressed 
suture: aperture nearly cireular: the inner peritreme slightly developed; 
outer peritreme smooth and widely expanded, (especially above and on the left 
side,) well appressed to the penult whorl; umbilicus very small. — 'T'he oper- 
culum is similar to that of C. album, being subspiral with oblique striae. — 
Var.: album wants the dark brown color, and has the spiral dotted lines 
more or less indistinct. — Var. virgatum is dingy or pearl white, with the 
spiral dotted lines conspicuous. (Adams i. c.) 
**) T. oblonga, pyramidali, spira acuminata, plerumque decollata; anfr. 
