276 
CISTULA §. 7. 
tura verticalis, subcircularis ; perist. duplex : internum vix por- 
rectum, externum horizontaliter expansum, superne in rostrum 
recurvatum dilatatum, ad anfr. penultimum breviter interrup- 
tum, latere sinistro inciso - crenulatum. — Operc. ? — Long. 
14, diam. 6 mill. Ap. 4 mill, longa. (Mus. Cuming.) 
Cyclostoma trochlea Pfr. in Proc. Zool. Soc. 1851. Jul. Nec Bens. 
— trochleare Pfr. in Chemn. ed. II. N. 315. t. 41. f. 7. 8. 
Cistula? trochlearis Pfr. Consp. N. 409. p. 68. 
Habitat . . .? 
455 31. C. Slsepai'diana Adams. 
T. perforata, oblongo-turrita , breviter truncata, tenuius- 
cula, lineis obtuse elevatis spiralibus, costulisque longitudina- 
libus confertissimis (quinta vel septima quavis validioribus) 
illas transgredientibus sculpta, cinnamomea; spira regulariter 
attenuata; sutura costularum fasciculis crenata; anfr. superst. 
5 convexi, ultimus antice longe solutus, deflexus, dorso serrato- 
carinatus, basi rotundatus ; apertura subverticalis, ovalis ; perist. 
aurantiacum , duplex : internum breviter expansum , externum 
angulatim patens, undulatum, superne anguloso-dilatatum. — 
Operc. normale. — Long. 12, diam. 5 r / 2 mill. Ap. 3 l / 2 mill, 
longa, 3 lata. (Coll. Nr. 198.) 
Cyclostoma Shepardianum Adams Contrib. to Coneh. N. 6. p. 92. *) 
— — Chemn . ed. II. N. 283. t. 38. f. 40—42. 
Cistula Shepardiana Pfr. Consp. N. 410. 
ft. Testa albida, seriatim castaneo-punctata ; perist. albido, castaneo-radiato : 
Cyclostoma Shepardianum var. Chemn. 1 . c. f. 43—45. 
Habitat in insula Jamaica. 
*) Shell long ovate-conic : color very various, from horn color to redd- 
ish brown or slate color , with paler and darker lines alternating , with the 
lip red or yellowish white: with very closely set fine raised lines, which are 
traversed and partially interrupted by numerous finely waved or zigzag spi- 
ral striae ; with the upper ends of the transverse lines somewhat fascicled : 
spire long , with the outlines a little curvilinear : apex truncate , with the 
loss of — whorls : remaining whorls five to five and one-half, very convex, 
with a deep suture ; the last whorl detached at its extremity from the penult 
whorl : aperture ovate-orbicular : inner peritreme moderately produced ; outer 
peritreme moderately expanded , auriculate above , almost wanting on the 
left side : umbilicus very narrow, extending through the truncate apex. Mean 
divergence 25 — 35°; length 0,32 — 57; greatest breadth 0,18 — 0,31; least 
breadth 0,13 -0,26 inch. (Adams 1. c.) 
