CYCLOPHORIDA. 77 
linear, reflected above, slightly auriculate at its base. Height 
10, breadth 13 mill. 
Cyclostoma Panayense, Sow. in Proc. Z. S. 1843, p. 62; Thes. 
n. 123, p. 184, t. 30, f. 239; Pfr. Jc. n. 162, p. 151, t. 20, f. 28, 29. 
Leptopoma Panayense, Pfr. in Z. f. MM. 1847, p. 108, n. 11; Consp. 
n. 156; Gray, Cat. Cyel. p. 25,0. 10; Pfr. Pneum. Mon. p. 108. 
Hab. The Philippine Islands of Panay and Samar (H. Cuming). 
12. LepropoMA PERPLEXUM. 2 Ba: 
Shell umbilicate, conoidal, rather thin, very minutely decussated 
under a lens, rather angulated by equidistant obsolete keels, 
slightly shining, uniformly whitish or varied with bands and 
spots of a yellow periostraca ; spire short, conoidal, pointed ; 
whorls 52, moderately convex, the last one more flattened 
beneath; aperture oblique, truncate-ovate, shining and white 
inside; peristome callous, thickened, expanded, with distant 
margins, joined by a rather thickened callus; columellar margin 
dilated and slightly reflected in the middle. Height 10, greatest 
breadth 16, least br. 13 mill. 
Cyclostoma perplexum, Sow. in Proc. Z. S. 1843, p. 63; Thes. 
n. 127, p. 186, t. 30, f. 243, 244; Pfr. Ic. n. 136, p. 130, t. 16, 
tbl, £2. 
Leptopoma perplexum, Pfr. in Z. f. M. 1847, p. 109, n. 14; Consp. 
n. 157; Gray, Cat. Cycl. p. 25, n.12; Pfr. Pneum. Mon. p. 109. 
Hiab. Island of Luzon, Albulug (H. Cuming). 
§ 3. Peristome reflexed, shell globose-conical, acutely keeled. 
13. LEPTOPOMA ACUTIMARGINATUM. B. M. 
Shell depressed-turbinate, rather thin, slightly obliquely striate, 
olivaceous-brownish, marbled and banded with white; spire 
short, conical, rather pointed ; whorls 5, moderately convex, 
the last one sharply keeled, more convex beneath ; umbilicus 
narrow, scarcely pervious ; aperture nearly circular, white and 
shining inside, with the external painting translucent ; peri- 
stome not quite continuous, white or yellow, expanded all round, 
with the columellar margin slightly thickened and reflected. 
Height 18, greatest breadth 29, least br. 234 mill. 
Cyclostoma acutimarginatum, Sow. in Proc. Z. 8. 1842, p. 80; 
Thes. n. 95, p. 124, t. 27, f. 188, 139 ; Reeve, Conch. Syst. t. 183, 
f.7; Pfr. le. n. 133, p. 128, t. 15, f. 19-22. 
Leptopoma acutimarginatum, Pfr. in Z. f. M. 1847, p. 109, n. 21; 
ce n. 158; Gray, Cat. Cycl. p. 27, n. 20; Pfr. Preum. Mon 
p. 110. 
fab, Island of Samar, Catbalonga (H. Cuming). 
