CYCLOSTOMUS §.9.10. 
233 
70. C. Cltevalleri Adams. *j* 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 moclice 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. albi , 
subspirale, striis obliquis. — Diverg. media circa 45°; long. 
0,68; lat. max. 0,48; lat. min. 0,35 poll. (Ad.) 
Cyclostoma Chevalicri Adams Contrib. to Conchol. N. 9. p. 155. *) 
Cyclostomus Chevalieri Pfr. Consp. N. 342. 
Habitat in insula Jamaica. 
§. 10 . 
71. €. thysanorlmiilie §©wea*foy. 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. 
Humphrcyani. — Long. 18, 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 conic: 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 circular: 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. — The oper- 
culum is similar to that of C. alburn , being subspiral with oblique striae. — 
Var. : album wants the dark brown color , and has the spiral dotted lines 
more or less indistinct. — Var. viryatum is dingy or pearl white, with the 
spiral dotted lines conspicuous. (Adams 1. c.) 
**) T. oblonga, pyramidali, spira acuminata, plerumque decollata; anfr. 
