xii * 
conical; aperture diagonal, lunately-rotund ; peristome simple, straight, 
margins slightly convergent, upper part somewhat bent backwards. 
Diam., greatest, 7 ; least, 6 ; height, 3 mill. 
Hab., New Zealand ; Tasmania. 
HELIX (CHAEOPA) GAMMA, Pfeiffer. 
Helix gamma, Pfr., P.Z.S., 1851 ; M.H.Y., vol. 3, p. 100 ; vol. 5, 
p. 153, No. 808. Helix buccinella, Eeeve. 
Shell umbilicated, depressed, thiunish, very closely striated with rib¬ 
like striae, diaphanous, pale horny, rufously clouded ; spire very slightly 
convex ] suture impressed i whorls 5, rather convex, slowly increasing, 
the last not descending, convex beneath; umbilicus broadish, conicaf- 
aperture sub-vertical, rotundly-lunar; peristome simple, straight, margins’ 
converging, regularly arcuated. 
Diam., 3 ; height, 11 mill. 
Hab., New Zealand (Strange). 
HELIX TAH, Pfeiffer. 
Helix tau, Pfr., Malak. Bl., viii., 1861, 148; M.H. Vvol. 5, p. 159 
No. 809. 
Shell broadly umbilicated, depressed, rather thin, above marked with 
somewhat apart rib-like plaits, rufous, tessellated with whitish ; spire 
slightly elevated, crown minute; whorls 5, rather convex, slowly 
increasing, the last tapering, not descending, slightly striated beneath ; 
aperture small, slightly oblique, lunar ; peristome simple, straight, 
margins hardly converging, columellar margin not dilated. 
Diam., greatest, 3 ; least, 2£ ; height, 1 mill. 
Hab., New Zealand (Hoehstetter). 
HELIX (CHAEOPA) EGESTA, Gray. 
Helix egesta, Gray, P.Z.S., 1849, p. 166 ; Pfr., M.H.Y., vol. 3, p. 102 • 
vol. 5, p. 164, No. 842. 
Shell broadly umbilicated, depressly semi-globose, rather solid, regularly 
spirally-furrowed, and strengthened with Strong longitudinal plaits, 
distantly placed, dilated into sub-triangular, membranaceous, deciduous 
lam ell®, black-rufous ; spire short, convex, above depressed ; whorls 
54, convex, the last tapering, generally inclining downward^; aperture 
small, a little oblique, lunately circular; peristome simple, straight, 
margins closely united. 
Diam., greatest, 4J- ; least, 4 ; height, 2| mill. 
Hab., Auckland, New Zealand (Sinclair and Greenwood). 
HELIX (PAEYPHANTA) OBNUBILA, Eeeve. 
Helix obnubila, Eeeve, Conch. Ic., No. 792, pi. 130 ; Pfr., vol. 3, p. 633 ; 
vol. 5, p. 164, No. 844. Helix sigma, Pfr. Nanina obnubila, Gray. 
Shell umbilicated, depressed, intensely fuscous, throughout decussated 
