80 CATALOGUE OF PHANEROPNEUMONA. 
more distinctly keeled at the lower periphery; umbilicus 
narrow, half covered ; aperture large, very oblique, truncatedly 
ovate ; peristome expanded, with distant margins, joined by a 
thin callus; right margin almost rectilinear; basal margin 
slightly arcuate ; columellar margin rather perpendicular, di- 
lated and reflected. Height 16, greatest breadth 19, least 
br. 15 mill. 
Cyclostoma fibula, Sow. in Proc. Z. S. 1843, p. 62; Thes. n. 126, 
p. 135, t. 80, f, 240-242; Pfr. Ic. n. 135, p. 130, t. 15, f. 23, 24, 
t. 16, f. 4. 
Cyclostoma fibulum, Jay, Catal. 1850, p. 255, n. 5864. 
Leptopoma fibula, Pfr. in Z. f. M. 1847, p. 109, n. 15; Consp. 
n. 164; Gray, Cat. Cycl. p. 26, 0.13; Pfr. Pneum. Mon. p. 113. 
Hab. The Island of Luzon (H. Cuming). 
20. LEPTOPOMA GONIOSTOMUM. B. M. 
Shell perforate, conoidal, thin, sculptured with several scarcely- 
raised spiral lines, pellucid, pale horn-coloured, variously striped 
and spotted with brown; spire conical, rather pointed ; whorls 6, 
scarcely convex, the last one sharply keeled, a little more 
convex on both sides; aperture diagonal, ovate, rather tri- 
angular, somewhat pearly inside; peristome thin, shortly ex- 
panded, with distant margins; right margin rather rectilinear ; 
columellar margin shortly dilated, not covering the very narrow 
umbilicus; basal margin arcuate. Operculum flat, with the 
edge of the volutions slightly raised. Height 131, greatest 
breadth 17, least br. 15 mill. 
Cyclostoma goniostoma, Sow. in Proc. Z. S. 1848, p. 64; Thes. 
n. 131, p. 137, t. 30, f. 233, 234; Reeve, Conch. Syst. t. 183, f. 3 ; 
er, ic. 10),p. 18, t..2, 1. 0-15 tb. 0, te. 
- Leptopoma goniostoma, Pfr. in Z. f. I. 1847, p. 109, n. 16; Consp. 
n. 165; Gray, Cat. Cyc. p. 26, n. 14; Pfr. Pneum. Mon. p. 114. 
Hab. Island of Mindanao, Cagayan, Province of Misamis (H. 
Cuming). 
21. LEPTOPOMA PILEUS. B. M. 
Shell perforate, conical, thin, whitish, sometimes clouded with very 
pale-brownish ; spire pyramidate, pointed; whorls 6, rather 
flat, the last one sharply keeled, moderately convex beneath ; 
aperture very oblique, ovate, rather angular on the side of the 
keel; peristome shortly expanded, having a white internal 
callus, with distant margins; columellar margin slightly dilated, 
half covering the narrow umbilicus. Height 15, greatest 
breadth 15, least br. 132 mill. 
Cyclostoma pileus, Sow. in Proc. Z. S. 1843, p. 31; Thes. n. 128, 
