UYCLOPHORIDA, 125 
ish-flesh-coloured; spire conoidal, with the apex rather blunt ; 
whorls 5, last cylindrical, deflexed anteriorly, smootlt beneath ; 
umbilicus wide, open; aperture very oblique, saffron-coloured in- 
side, irregularly rounded; peristome white, slightly thickened, 
interrupted, with the margins distant, upper margin rather 
expanded, basal margin shortly reflexed. Height 43, greatest 
breadth 8, least br. 7 mill. 
Cyclostoma Souleyetianum, Petit, in Journ. Conch. 1850, i. p. 52, 
t. 3, £.6; Pfr. Ic. n. 249, t. 35, f. 23, 24. 
Cyclostoma paradoxum, Pfr. in Z. f. MM. 1849, p. 128. 
Lithidion Souleyetianum, Pfr. Consp. n. 257; Pneum. Mon. 
Be Li7. 
Hab. The Island of Abd-el-Goury, near Socotora (Guillaim). 
4, LITHIDION DEPRESSUM. 
Shell depressed, solid, sculptured above with six spiral ridges, 
slightly shining, whitish, marbled with pale horn-coloured flames 
and angular streaks; spire flat, with the apex slightly pro- 
minent, nipple-shaped; suture deep; whorls 43, moderately 
convex, the last one keeled at its upper periphery, rounded and 
smooth beneath; umbilicus wide, deep; aperture diagonal, 
rather circular; peristome simple, straight, slightly interrupted, 
with the upper margin emarginate. Height 4, greatest breadth 
12, least br. 10 mill. 
Cyclostoma depressum, Sow. Thes. Suppl. n. 185, p. 161*, t. 31 B. 
f. 306, 307; Pfr. Ic. n. 247, t. 35, f. 17-19. 
Lithidion depressum, Pfr. Consp. n. 258; Pnewm. Won. p. 178. 
Locality unknown. 
5. LitHIDION NIVEUM. 
Shell broadly umbilicate, rather depressed, solid, indistinctly 
spirally striate above, slightly shining, white; spire little raised, 
mucronate ; suture deep; whorls 4}, moderately convex, the 
last one keeled above the middle, convex and smooth beneath; 
aperture diagonal, rather circular, flesh-coloured inside; peri- 
stome rather simple, shortly interrupted, with the margins 
joined by thin callus, upper margins sinuate, slightly expanded. 
Height 5, greatest breadth 11, least br. 9 mill. 
Cyclostoma niveum, Petit, in Journ. Conch. 1850, i. p. 52, t. 3, £.7; 
Pfr. Ic. n. 248, t. 35, f. 20-22. 
Lithidion niveum, Pfr. Consp. nu. 259; Pnewm. Mon. p. 178. 
Hab. Madagascar. 
