294 CATALOGUE OF PHANEROPNEUMONA. 
bands ; spire short, blunt ; whorls 4, nearly flat, enlarging gra- 
dually, last sharply keeled, more convex beneath, marked some- 
times with indistinct raised spiral lines; aperture somewhat 
oblique, obtusely triangular; columella short, with an indistinct 
knot ; peristome sharp, expanded very narrowly ; basal callus 
shining, surrounded with a whitish line. Operculum thin, flesh- 
coloured. Height 32, greatest breadth 53, least br. 5 mill. 
Helicina Nicobarica, Philippi, in Z. f. M. 1847, p. 149; Pfr. Ic. 
n. 85, p. 62, t. 2, f. 19-21; Pneum. Mon. p. 402. 
Hab. The Nicobar Islands (Th. Philippi). 
§ 12. Peristome not toothed, expanded; shell with two more or 
less distinct keels. 
148. Henicina BEscKet. 
Shell nearly semiglobose, solid, very minutely striated, nearly 
smooth, opaque, uniformly lemon-yellow or painted with a 
single blood-red band along the suture, sometimes reddish 
throughout; spire short, convexly-conoidal, slightly mucro- 
nated; whorls 5, rather flat, last not descending, furnished with 
a single sharp peripherical and several more obtuse keels; aper- 
ture oblique, rather triangular; columella shortly receding, 
indistinctly angulated at its lower extremity; peristome ex- 
panded, somewhat thickened, upper margin nearly rectilinear, 
basal margin slightly arcuate; basal callus extremely thin. 
Operculum semiovate, shining and reddish-chestnut-coloured 
on the outer, pale on the inner side. Height 10, greatest 
breadth 17, least br. 14 mill. 
Helicina Besckei, Pfr. in Proc. Z. 8. 1848, p. 120; Z. f. Mf. 1848, 
p- 88; Je. n. 87, p. 64, t. 4, f. 1-4; Pnewm. Mon. p. 402. 
Helicina carinata, Sow. Thes. t. 2, f. 60 (not D’Orbigny). 
Hab. Brazils. 
149. HELICINA VARIABILIS. B. M. 
Shell orbiculate-conoidal, rather solid, spirally striated, slightly 
shining, uniformly yellowish or painted with broad purplish or 
violaceous bands; spire conoidal, rather pointed; whorls 52, 
nearly flat, last furnished with two keels, one peripherical, 
stronger, the other more obtuse below the first; aperture entire, 
semiovate; columella short, dilated backwards into a white, 
circumscript callus; peristome white, widely expanded, with 
the right margin depressed. Operculum semiovate, blackish- 
ae ae Height 10, greatest breadth 14, least br. 12 
mill. 
