CYCLOPHORIDZ. 97 
coloured; spire turreted, with the apex rather pointed; whorls 
7-74, moderately convex, the last not lessened, scarcely pro- 
duced beneath beyond the axis; basal keel compressed, scarcely 
dilated anteriorly ; space between the keel and umbilicus rather 
broad, more deeply striate, turgid in the middle; aperture nearly 
circular; peristome white, continuous, shortly affixed, thickened, 
expanded horizontally and slightly reflected, scarcely produced 
at its lower part, and grooved by a middle-sized channel. Length 
23, breadth 10 mill. 
Cataulus pyramidatus, Pfr. in Proc. Z. S. 1852; Ic. t. 48, £11; 
Pneum. Mon. p. 137. 
8 Larger, with the basal part of the peristome angularly pro- 
duced; length 29, breadth 122 mill. (Pfr. Jc. t. 48, f. 9, 10.) 
Hab. Ceylon. 
5. CATAULUS EURYTREMA. 
Shell subperforate, oblong, rather fusiform, solid, with slightly- 
arcuated strix, scarcely shining, chestnut-coloured; spire tur- 
reted, with the apex rather blunt; whorls 83, convex, last nar- 
rower, with the base obliquely produced beyond the axis; basal 
keel strong, compressed, dilated gradually, like a tube, towards 
the peristome; aperture circular; peristome flesh-coloured, con- 
tinuous, shortly affixed, thickened and reflected, with the left 
part of the basal margin grooved by a large canal, which is 
rather circular, and is produced inwards into a filiform crevice. 
Length 26, breadth 10 mill. 
Cataulus eurytrema, Pfr. in Proc. Z. S. 1852; Jc. t. 48, f. 12, 
13; Prneum. Ion. p. 138. 
Hab. Ceylon. 
6. Catautus THwalIvTeEst. 
Shell scarcely perforate, turreted, rather fusiform, solid, sculptured 
with crowded small longitudinal ribs, scarcely shining, vio- 
laceous-brown ; spire ovate-turreted, with the apex rather 
pointed; suture impressed; whorls 7-74, moderately convex, 
last a little lessened; basal keel very strong, compressed, spread- 
ing angularly, white; aperture perpendicular, circular; _peri- 
stome double, white; inner edge deeply grooved at its lower 
part, outer edge emarginated on the penult whorl, otherwise 
thickened and reflexed, perforated at its base by a middle-sized 
channel. Length 19, breadth 7 mill. 
Cataulus Thwaitesi, Pfr. in Proc. Z. S. 1852; Jc. t. 49, f. 9, 
10; Pneum. Mon. p. 138. 
Hab. Ceylon (Mr. Thwaites). 
