16 HELICID. 
or open; aperture regular, semi-lunar, generally without teeth ; peristome 
thickened or reflexed. 
Genus, HELIX—Linneus. 
Shell imperforate, or with the umbilicus covered, more or less 
globose; whorls convex, the last large, ventricose, deflexed at the 
aperture ; aperture lunately orbicular ; peristome patulous or reflexed, 
columellar margin dilated, callous. 
Sub-Genus, Rhagada—A lbers. 
Shell imperforated, somewhat globose, rather solid, striated, whitish, 
banded; whorls 4%4-5%, regularly increasing, rather convex, the last 
slightly descending in front, convex at the base ; aperture exceedingly 
oblique, lunar ; peristome lipped within, somewhat expanded. 
H. reinga, Gray; OUnpub. List N.Z. Shells, pl. 1, fig. 11, 12; 
LR MALV.. VOLT, P2805 V0l 5; P. 2025) NOx LOOkeheecve, My Fig 2s 
Shell perforated, perforation covered, globosely-depressed, rather solid, 
obliquely finely striated, whitish, adorned with a single chestnut-coloured 
band, and with many orange-coloured lines ; spire sub-elevated ; whorls 
534, rather convex, gradually increasing, the last convex beneath, 
descending anteriorly; aperture very oblique, narrow, sub-triangularly 
lunar; peristome shortly expanded, within white-lipped, columellar 
margin straightish, obscurely and obtusely unidentated. 
Diam., greatest, 59; least, 51; height, -4. (Pfr.) 
New Zealand. 
Sub-Genus, Rhytida—Albers. 
Shell umbilicated, thin, convexly-depressed, undulatingly wrinkled or 
striated ; spire slightly elevated ; whorls 4-5, flattish ; umbilicus broad, 
funnel-shaped ; aperture oblongly-ovate ; peristome simple, sharp, 
margins converging. 
H. greenwoodi, Gray; P.ZS., 1849, p. 165; Pf&, MAS, 
vol. 3, Pp. 156; vol. 5, p. 247, Vo. 1520; Reeve, f. 434. Shell umbilr 
cated, convexly-depressed, thinnish, throughout very closely rugosely- 
granulated, slightly shining, fuscous, with an olive-green tinge; spire 
smallish, convex, rather obtuse ; suture impressed ; whorls 4, rather 
convex, rapidly increasing, the last large, strengthened at the periphery 
with many elevated, obtuse, backwardly-descending bands, anteriorly 
descending, a little convex at the base, sub-compressed at the entrance 
of the chestnut-coloured, funnel-shaped umbilicus; aperture very 
oblique, oblongly-oval, within shining, whitish ; peristome simple, 
margins closely united, superior portion straight, bent backwards, 
inferior portion thickish, dilated and reflexed towards the columella. 
Diam., greatest, ‘93; least, °75; height, 47. (Pfr.) 
Auckland. 
H. dunnise, Gray; Ann. and Mag. Nat. Hist., vol. 6, 1841, p. 
B21 7n3 byt, DEL V eS OLS Deore” Cole 5, Ps 250, Vom nes 7 1 aCeege, 
f 425; Voy. Erebus and Terror, Moll, pl. 1, f. 7. Shell umbilicated, 
depressed, fuscous, keeled, irregularly granularly striated ; spire slightly 
elevated, obtuse ; whorls 4, flattened, the last slightly descending 
