VI 
not descending, rather swollen near the aperture ; aperture slightly 
oblique, broadly lunar; peristome simple, straight, margins sub¬ 
converging, columellar margin slightly patulous. 
Diam., greatest, 4 ; least 3§ ; height, 3 mill. 
Hah., New Zealand. 
HELIX (THALASSIA) GLABRIUSCULA, Pfeiffer. 
Helix glabriuscula, Pfr., P.Z.S., 1851 ; M.H.Y., vol. 3, p. 51 ; 
vol. o, p. 71, No. 193. 
Shell perforate, conoidly-semiglobose, thin, smooth, pellucid, shining, 
pale yellow, angularly lined with rufous; spire convexly-conoidal, 
slightly acute; whorls 5^, slightly convex, the last not descending, 
flattish beneath ; aperture oblique, sub-depressed, lunar; peristome 
simple, straight, columellar margin bent downwards, slightly reflexed 
above. 
Diam., greatest, 3J ; least, 3 ; height, 2 mill. 
Hab., New Zealand (Strange). 
HELIX CHORDATA, Pfeiffer. 
Helix chordata, Pfr., Malak. BL, viii., 1861, p. 147 ; M.H.Y., vol. 5, 
p. 72, No. 200. 
Shell sub-perforate, globosely-turbinated, thin, somewhat closely covered 
with cord-shaped ribs, not shining, marbled minutely with whitish and 
reddish ; spire couvexly conical, somewhat sharp ; whorls 5, convex, the 
last slightly inflated at the base; aperture a little oblique, lunar; 
peristome simple, straight, margins remote, columellar margin slightly 
reflected at the perforation. 
Diam., greatest, 3f ; least, 35}; height, 3 mill. 
Hab., New Zealand (Hoehstetter). 
This shell differs from its near ally, the H. iota, Pfr., by the turbinated 
spire, and by the almost closed-up perforation. 
HELIX (TROCHOMORPHA) OPHELIA, Pfeiffer. 
Helix ophelia, Pfr., P.Z.S., 1854, p. 146; M.H.Y., vol. 4, p. 29 ; vol. 5, 
p. SO, No. 241. 
Shell perforated, turbinately depressed, thin, under the lens irregularly 
marked with hair-like striae, not shining, diaphanous, horny, marked 
with narrow reddish streaks; spire rather convexly conoidal, crown 
small, line, somewhat acute; whorls 5, flatfish, rather prominent, 
gradually increasing, the last not descending, sub-angular, flattish at the 
base ; aperture oblique, rotundly-lunar, within shining ; peristome 
simple, straight, margins slightly converging, basal margin rather 
constricted, columellar margin bent downwards, near the very narrow 
and pervious umbilicus, shortly reflexed. 
Diam., greatest, 8 ; least, 7 ; height, 4J mill. 
Hah., New Zealand (Hoehstetter); Australia (Pfr.) ; Cape York, 
North Australia (Edwards) ; Cox, Austr. Land Shells, 1863, p. 35. 
