184 CATALOGUE OF PHANEROPNEUMONA. 
peristome continuous, simple, straight, with the columellar 
margin slightly expanded. Operculum with the shelly lamina 
very thin, separated from the inner cartilaginous by a deep fur- 
row. Length 12, breadth 8} mill. 
Cyclostoma pleurophorum, Pfr. in Proc. Z. 8. 1851; Ic. n. 299, 
t. 40, f. 5, 6. 
Cistula pleurophora, Pfr. Consp. n. 383, p.66; Pneum. Mon. p. 262. 
Hab. Honduras. 
§ 2. Shell ovate or oblong-turreted; last whorl not detached; 
peristome simple. 
5. CIsTULA RADIOSA. 
Shell subimperforate, thin, ovate-oblong, truncate, decussated with 
blunt concentric ridges and very crowded longitudinal raised 
lines, not shining, diaphanous, pale fulvous, girdled with reddish- 
brown lines; suture simple; whorls remaining 41, moderately 
convex, the last not larger than the preceding; aperture per- 
pendicular, rather ovate, slightly angulated above; peristome 
simple, reflexed broadly and rectangularly, with the edge 
striated concentrically, marked with reddish-brown rays, in- 
dented on the penultimate whorl. Operculum like that of C. 
catenata. Length 15-16, breadth 8 mill. 
Cyclostoma radiosum, Morelet, Testac. Noviss. i. p. 22, n. 55; Pfr. 
Hern. 20), 4. of, f. 19,16: 
Cistula radiosa, Pfr. Consp. n. 384; Pneum. Mon. p. 263. 
Hab. Guatemala, the province of Peten. 
6. CistutA TAMSIANA. 
Shell subperforate, oblong-turreted, scarcely or not truncate, 
rather thin, sculptured with longitudinal plaits, slightly shining, 
blueish-fuscous, marked with interrupted chestnut-coloured lines 
or concentric series of points; suture denticulated very minutely 
and closely; whorls 7, convex, last scarcely detached anteriorly ; 
aperture rather perpendicular, roundish, slightly angulated; 
peristome simple, continuous, shortly expanded all round. Oper- 
culum fuscous. Length (when not truncate) 16, breadth 7 mill. 
Cyclostoma Tamsianum, Pfr. in Z. f. MM. 1850, p. 77, Zc. n. 268, 
t. 37, f. 19, 20. 
Cistula Tamsiana, Pfr. Consp. n. 385; Pneum. Mon. p. 263. 
Hab. Venezuela, Porto Cabello (Dr. Tams). 
6a. Cistunta RwseEI. 
Shell subperforate, oblong-turreted, thin, closely sculptured with 
equal, chordiform, longitudinal ribs, diaphanous, pale horn- 
