164 CATALOGUE OF PHANEROPNEUMONA. 
maining 4, convex, increasing regularly, the last one somewhat 
produced with its base; suture beset with rather large white 
teeth; aperture nearly vertical, rounded, rather angular; peri- 
stome double; inner edge continuous, shortly prominent ; outer 
edge bell-like expanded, white with reddish-brown rays, inter- 
rupted at the penultimate whorl, dilated above and near the 
umbilicus into small sinuate inflexed auricule. Operculum like 
that of C. Humphreyanum. Length 18, breadth 10 mill. 
Cyclostoma thysanorhaphe, Sow. Thes. n. 145, p. 148, t. 28, f. 162, 
163; Pr. Ic. n. 75, p. 81, t. 10, f. 16-18. 
Choanopoma thysanoraphe, Gray, Cat. Cyel. p. 53, n. 26. 
Cyclostomus thysanorhaphe, Pfr. Consp. n. 343; Pneum. Mon. 
p. 233. 
Hab. Jamaica. 
73. Cyctostomus REDFIELDIANUS. 
Shell perforate, ovate-conic, thin, very closely folded longitudi- 
nally, silk-shining, whitish, with several series of brown spots, 
or violaceous-brownish, with single series of darker dots; spire 
conic, shortly truncate, blackish and more distinctly ribbed 
near the summit; suture deep, fringed with irregularly distant 
white knots; whorls remaining 33, convex, enlarging rapidly, 
last rounded ; aperture perpendicular, rather circular; peristome 
double; inner edge shortly produced; outer edge expanded 
angularly, indented on the penultimate whorl, dilated above 
into an excavated auricula, and on the left side into a rather 
broad fringed wing. Operculum like that of C. thysanorhaphe. 
Length 17, breadth 10 mill. . 
Cyclostoma Redfieldianum, Adams, Contrib. to Conch. p.10; Pfr. 
Ic. n. 263, t. 37, f. 7, 8. 
Cyclostomus Redfieldianus, Pfr. Consp. n. 344; Pneum. Mon. 
p. 234. 
B. Spire scarcely truncate, with six whorls, the last with sharp 
rib-like striz; inner peristome expanded, affixed; length 17, 
breadth 9 mill. 
Hab. Jamaica. 
74. CycLostomus JAYANUS. 
Shell deeply rimate, ovate-conic, rather solid, closely folded longi- 
tudinally, somewhat shining, whitish, marked with oblique broad 
angular brownish stripes or interrupted bands; spire elongate- 
conic, scarcely or not truncated; suture furnished with minute 
teeth on the upper whorls, rather simple on the following ones; 
whorls 45-6, convex, last rounded, with its base somewhat pro- 
duced beyond the axis; aperture scarcely oblique, rather cir- 
cular, fulyous and shining within ; peristome double, red, white 
