CYCLOSTOMUS $8. 11. 941 
Cyclostoma vetrorsum Chemn. ed. II. N. 258. t. 36. f. 15. 16. 
Cyclostomus retrorsus Pfr. Consp. N. 351. 
Habitat in insula Jamaica. 
Obs. Haec testa opereulo suo aliquantum ad Choanopomata accedit, 
forma, sculptura et peristomate J«ameiciae Moussonianae persimilis. 
883 . €. salebrosus YEiorelet. 396 
T. rimato-subperforata, ovato-turrita, truncata, solidula, 
costis longitudinalibus confertis, sublamellosis, lineisque spira- 
libus scabriuseula, haud nitens, albido-cinerascens; sutura 
irregulariter serrulata; anfr. superst. 3—3'/, convexi, ultimus 
rotundatus, antice descendens, solutus, dorso carinatus; aper- 
tura fere verticalis, subeircularis; perist. duplicatum : internum 
prominens, expansiusculum, externum superne angulatim pro- 
ductum, latere dextro vix reflexum, columellari dilatatum, 
patens. — Opere. testaceum, extus medio convexiusculum, 
margie profunde suleatum, anfr. 4, in lamina exteriore obli- 
que profunde suleatis, nucleo fere centrali. — Long. 16, diam. 
10 mill. Ap. oblique 6 mill. longa. (Coll. Nr. 169.) 
Cyclostoma salebrosum Morelet 'Test. noviss. p. 23. N. 59. *) 
— — Chemn. 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 
thiekened 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 distinet 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. 
Opereulum with the spiral lamella dilated and reflected so as to leave only 
a very narrow channel between its whorls. Mean divergence about 509; 
length 0,615; greatest breadth 0,5; least breadth 0,33 inch, (Adams 1. c.) 
*) TT. oblongo-subventricosa , truncata, solida, scabriuscula, albido-cine- 
rascens, confertissime et argute decussata; anfr. 4 convexi, ultimo ventricoso, 
disjuneto, sursum obtuse carinato. Apertura 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. l. c.) 
16 
