146 
MOLLUSCOUS ANIMALS. 
Helicina OX YTROPIS, t. 38./. 24. 
Shell suborbicular, rather depressed, smooth, carinated, pale yellow ; spire depressed, conical, of four 
sharp keeled volutions ; aperture wide, sharply angular at its outer edge. 
Helicina solidula, t. 38./. 26. 
Shell nearly globular, smooth, solid, thick, yellow, spire of four rather ventricose volutions, the last 
large, obtusely keeled ; aperture rather small, thick-lipped, obtusely angular at its outer edge. 
Auricula pallida, t. 38./. 27. 
Shell ovate, oblong, almost colourless, smooth, slightly longitudinally striated ; apex acuminated ; spire 
very short, of six whorls, the last of these four times as long as the spire ; peritreme thickened, outer lip not 
reflected ; anterior part of the columellar lip reflected over the small umbilicus; front of the columella with 
one distinct fold and another, nearly obsolete, placed anteriorly to it. 
Melampus pallescens, t. 38./. 28. 
Shell obovate, white, very smooth, covered with a pale greyish yellow periostracum ; spire short, con- 
sisting of seven or eight whorls, abruptly acuminated at the apex ; last whorl very large, rounded, angular near 
the hinder part, blunt anteriorly; aperture elongated, narrow, rather more so posteriorly than anteriorly; 
outer lip thickened inwardly, with five or six blunt teeth ; columellar lip with three or four rather irregular 
blunt folds. 
Cyclostoma immaculatum, t. 38. /. 29. Sowerby, Species Conchyliorum. Part 
II. Cyclostoma, /. 124. 
Shell globoso-conical, thin, pellucid, nearly white, smooth, spire acuminated, of five rounded whorls ; 
last whorl ventricose ; aperture nearly circular; peritreme reflected, white; umbilicus small. 
Hab. Lufon. 
Cyclostoma albicans, t. 38. /. 30. Sowerby, Species Conchyliorum. Part II. 
Cyclostoma, /. 104, 105. 
Shell nearly globular, whitish, with an obtuse spire consisting of five rounded whorls, spirally grooved on 
the upper part, very smooth below; aperture nearly circular, rather acuminated posteriorly, peritreme thick- 
ened, somewhat sinuous above, anterior part of the outer edge thickened and reflected ; inner edge with an 
angle on the side of the umbilicus, which is large and smooth within. 
Inhabits some of the islands of the Southern Pacific. 
Cyclostoma filosum, t. 38. /. 31. Soiverby, Species Conchyliorum. Cyclostoma, 
f- 16- 
Shell of a somewhat conical orbicular form, its spire rather shorter than the aperture, thickish, of a pale 
colour, with five rounded, longitudinally striated and carinated whorls; the two more prominent keels speckled 
with reddish brown, the lower one running along the suture, which is otherwise very indistinct ; aperture 
circular, peritreme rather thickened, sinuated at the upper part, and rather angular, forming a very short, in- 
conspicuous canal, edge rather obtuse ; umbilicus large, deeply grooved within, its edge with two prominent 
keels. 
Hab. India. 
