104 CATALOGUE OF PHANEROPNEUMONA. 
5. REGISTOMA EXIGUUM. B. M. 
Shell imperforate, pupa-shaped, thin, smooth, pellucid, whitish- 
glassy; spire shortly conical above, with the apex rather 
pointed; whorls 53, scarcely convex, joined by a callous suture, 
last whorl more narrow beneath; aperture nearly circular, with 
the base proceeding beyond the axis; peristome slightly thick- 
ened, rather expanded; columellar margin dilated and trun- 
cated, separated from the basal margin by an oblique linear 
notch. Length 7, breadth scarcely 4 mill. 
Pupina exigua, Sow. in Proc. Z. S. 1841, p. 103; Thes. n. 6, p. 18, 
t.4, 1.17; Pfr. Ic. p. 204, t. 30, f. 38. (From Sow.) 
Registoma exiguum, Gray, Cat. Cycl. p. 33, n. 5; Pfr. Consp. 
n. 215; Pneum. Mon. p. 147. 
Hab. Island of Zebu, 8. Nicolas (H. Cuming). 
6. Rearstoma NrcoBaRIcuM. 
Shell imperforate, ovate-conical, rather solid, highly-polished, 
shining, pale reddish-yellow; spire convex, conical above, with 
the apex rather pointed; suture linear; whorls 5, scarcely con- 
vex, the last one descending obliquely, shortly ascending near 
the aperture, rounded beneath; aperture nearly perpendicular, 
circular, marked with a minute callous knot near the insertion 
_ of the right margin; peristome simple, scarcely expanded; 
columellar margin slightly thickened, separated from the basal 
ee by a short rather ascending notch. Length 6, breadth 
3 mill. 
Pupina Nicobarica (Registoma), Pfr. in Proc. Z. S. 1852; Jc. t. 48, 
f. 28-31; Pnewm. Mon. p. 147. 
Hab. The Nicobar Islands. 
XIV. CALLIA. 
Operculum thin, membranous, narrow-whorled. Shell pupiform, 
covered with a smooth shining callus. Peristome subcontinuous, 
straight, scarcely thickened; columellar margin entire, above 
appressed-reflexed, altogether closing the perforation, which is 
conspicuous in young shells. 
Callia, Gray, Ann. of Nat. Hist. vi. 1840, p. 77; Syn. Brit. Mus. 
1842, p. 91; Proc. Z. 8. 1847, p. 182; Cat. Cycl. p.34; Pfr. in 
Z. £. M. 1847, p.110; Cheman. ed. ii. Cycl. p. 207; Z. £. Hf. 1851, 
p- 152 ; Consp. p. 24; Pneum. Mon. p. 148. 
Pupina spec., Sow. 
