CYCLOSTOMUS §.11. 
241 
Cyclostoma retrorsum Chcmn. ed. II. N. 258. t. 36. f. 15. 16. 
Cyclostomus retrorsus Pfi\ Consp. N. 351. 
Habitat in insula Jamaica. 
Obs. Haec testa operculo suo aliquantum ad Choanopoma/a accedit, 
forma, sculptura et peristomate Jamaiciae Moussonianac persimilis. 
83 C. saBeljirosiis Morelet* 396 
T. rimato-subperforata , ovato-turrita , truncata, soliclula, 
costis longitudinalibus confertis, sublamellosis, lineisque spira- 
libus scabriuscula , haucl nitens, albido - cinerascens ; sutura 
irregulariter serrulata; anfr. superst. 3 — 3'/ 2 convexi, ultimus 
rotundatus, antice descendens, solutus, dorso carinatus; aper- 
tura fere verticalis, subcircularis; perist. duplicatum : internum 
prominens , expansiusculum, externum superne angulatim pro- 
ductum, latere dextro vix reflexum, columellari dilatatum, 
patens. — Operc. testaceum, extus medio convexiusculum, 
margine profunde sulcatum, anfr. 4, in lamina exteriore obli- 
que profunda sulcatis, nucleo fere centrali. — Long. 16, diam. 
10 mill. Ap. oblique 6 mill, longa. (Coll. Nr. 169.) 
Cyclostoma salebrosum Morclet Test, noviss. p. 23. N. 59. *) 
— — Chcmn. ed. II. N. 260. t. 36. f. 19—21. 
Cyclostomus salebrosus Pfr. Consp. N. 352. 
Habitat ad montem Guajaibon insulae Cubae. 
and a few small dots of the same, which are inequidistant in spiral series: 
with numerous fine spiral ridges (of which one or two next the suture are 
larger), which are decussated by numerous inequidistant moderately elevated 
lamellae , which are produced at the intersections into triangular points 
thickened at their bases : spire well lengthened, with the outlines quite cur- 
vilinear : apex truncate, with the loss of — whorls ; remaining whorls nearly 
four , very convex , with a deep suture ; last whorl not separated from the 
penult whorl; aperture orbicular: inner peritreme scarcely distinct from 
the outer, which is thick and wide, finely radiated with impressed lines,. and 
reflected very far behind the plane of the aperture, so as to form a canal 
behind it: umbilicus very small, but extending through the truncate apex. 
Operculum with the spiral lamella dilated and reflected so as to leave only 
a very narrow channel between its whorls. Mean divergence about 50°; 
length 0,615; greatest breadth 0,5; least breadth 0,33 inch. (Adams 1. c. ) 
*) T. oblongo-subventricosa , truncata, solida, scabriuscula, albido-cine- 
rascens, confertissime et argute decussata; anfr. 4 convexi, ultimo ventricoso, 
disjuncto, sursum obtuse carinato. Apcrtura rotundata; perist. integrum, 
duplex ; internum nitidum, crassiusculum , rectum ; externo vix distincto, ad 
carinam angulatim reflexiusculo ; latere columellari breviter dilatato. — Long. 
16, diam. 10 mill. (Mor. 1. c.) 
16 
