CYCLOSTOMUS § 10. 
239 
ovalis; perist. duplicatum : internum rectum, externum undique 
subaequaliter patens. — Operc. terminate, testaceum, nucleo 
parura excentrico, anfr. 4 oblique confertim sulcatis, margine 
subelevato. — Long. 10 — 11, diam. 4 1 /* — 5 mill. Ap. 3 - 3'/* 
mill, longa, 2 f / 2 — 2 3 / 4 lata. (Coll. Nr. 165.) 
Cyclostoma rugulosum Pfr. inWiegm. Arch. f. Nat. 1839. I. p. 356. 
— — Chemn. ed. II. N. 120. p. 117. t. 14. f. 9 — 11. 
t. 38. f. 11. 12. 
— clathratum Gould in Bost. Journ. IV. 1. 1842. (In involucro.) 
— verecmidum Poey Memories I? 
Cistula rugulosa Gray Catal. Cycloph. p. 59. N. 10. 
Cycloslomus rugulosus Pfr. Consp. N. 349. 
Habitat in insula Cuba. 
80. ©. Wilkinson! Adorns. 393 
T. subperforata, cylindraceo-turrita, truncata, tenuis, lon- 
gitudinaliter confertim costata, diaphana, albida, rufo seriatim 
et obsolete maculata; sutura lamelloso - dentata ; anfr. superst. 
4 convexi, lente accrescentes , ultimus disjunctus, descendens, 
dorso carinatus, latere columellae spiraliter sulcatus; apertura 
axi subparallela, ovalis ; perist. duplex : internum vix porrectum, 
externum undique breviter reflexum. — Operc. fere C. rugu- 
losi. — Long. 8 , diam. 3 l / 2 mill. Ap. 2 mill, longa. (Coll. 
Nr. 166.) 
Cyclostoma Wilkinsonii Adams Contrib. to Conch. N. 1. p. 6. *) 
— — Chemn. ed. II. N. 376. t. 46. f. 17-19. 
— Vilkinsoni Adams Catal. Apr. 1851. 
Cycloslomus Wilkinsoni Pfr. Consp. N. 350. 
(i. .Testa minore, nnicolore , anfract. 3'/ 2 , ultimo minus disjuncto; long. 6» 
diam. 3 mill. (Mus. Cuming.) 
Cyclostoma modestum Adams Contrib. to Conch. N 1. p. 6. **) 
Habitat in insula Jamaica. 
*) Shell small, subcylindrical ; whitish, with a few small distant pale 
brown spots in a spiral series ; with not very closely set sharp transverse 
raised lines ; spire with sligthly convex outlines ; apex truncate with the loss 
of three whorls, of which the second and third are seen in the young shell 
to be entirely and widely detached ; four whorls remaining, very convex, 
with a very deep suture; last whorl widely detached from penult whorl near 
the aperture, acutely angular above; aperture suborbicular , quite angular 
above ; inner peritreme moderately produced ; outer peritreme rather small, 
concentrically striated , reflected a little back of the plane of the aperture, 
above produced into an angle, with two or three small brown spots; umbi- 
licus very small, but extending through and spreading near the apex. Mean 
divergence about 17°; length 0,35; greatest breadth 0,16; least breadth 0,12 
inch. (Adams 1. c.) 
**) Shell small , elongate ; whitish ; with thin raised laminae, which are 
