CYCLOPHORIDE. 69 
5, convex, increasing rapidly, the last one cylindrical ; umbilicus 
wide; aperture nearly perpendicular, rather circular, blueish 
inside; peristome simple, straight, continuous, shortly affixed, 
with a very indistinct angle above; with the upper margin 
nearly horizontal, columellar margin slightly thickened. Oper- 
culum thin, rather cartilaginous. Height 16, greatest breadth 
35, least br. 28 mill. 
Cyclostoma texturatum, Sowerby, Thes. Suppl. n. 182, p. 160%, 
t. 31, A. f.303; Pfr. Ic. n. 243, t. 35, f. 10, 11. 
Cyclophorus texturatus, Pfr. Consp. n. 140; Pneum. Mon. p. 97. 
Hab. Guatemala. 
80. CycLtepHorus Dysont. 
Shell conoidally orbicular, solid, sculptured with close-set, slight, 
waving, rather confluent folds, brownish-olivaceous, with paler 
streaks and obsolete bands; spire conoidal, with the apex rather 
blunt; whorls 43, moderately convex, enlarging rapidly, last 
rounded; umbilicus middle-sized, conic; aperture nearly per- 
pendicular, rather circular, slightly angulated, blueish and 
shining inside; peristome simple, straight, angulated above, 
shortly affixed, with the right margin declivous; columellar 
margin somewhat dilated and expanded. Operculum? Height 
16, greatest breadth 27, least br. 22 mill. 
Cyclostoma Dysoni, Pfr. in Proc. Z. S. 1851; Jc. n. 244, t. 35, 
ao,,6 
Cyclophorus ? Dysoni, Pfr. Consp. n. 141, p. 56; Pnewm. Mon. 
p. 98. 
. 
fab. Honduras (Mr. Dyson). 
§ 12. Shell depressed, with simple radiating stric ; peristome 
straight, thin. 
81. CycLoPHORUS ANNULATUS. 
Shell much depressed, nearly discoidal, rather solid, with slightly- 
wrinkled striz, white, with obsolete brownish spots above, and 
a single band below the periphery, covered with a thin, oliva- 
ceous, horn-coloured periostraca; spire flat, with the minute 
apex scarcely prominent; whorls 43, moderately convex, the 
last one slowly descending ; umbilicus broad and deep ; aperture 
oblique, ovate-roundish; peristome rather simple, imperceptibly 
expanded all round, with the margins approximate, joined by a 
short callus and forming a slight angle below the middle of the 
penult whorl. Operculum thin. Height 6, greatest breadth 18, 
least br. 15 mill. 
Cyclostoma annulatum, Troschel, MSS.; Pfr. in Z. f. M. 1847, 
p. 150; Jc. n. 175, p. 162, t. 22, f.17-19. 
