HELIX (THALASSIA) HELD I AN A, Pfeiffer. 
Helix Heldiana, Pfr., P.Z.S., 1851 ; M.H.Y., vol. 3, p. 60 ; vol. 5, 
p. 87, No. 279. 
Shell perforated, minute, trochiformed, thin, smooth, shining, fulvous- 
horny ; spire conical, rather obtuse; suture impressed; whorls 5J, 
somewhat convex, the last keeled, not descending, slightly more convex 
beneath ; aperture slightly oblique, depressed, angularly lunar; peristome 
simple, straight, margins remote, columellar margin very shortly some¬ 
what reflected. 
Diam., 2 ; height, l|*mill. 
Hab., New Zealand (Strange). 
HELIX (THALASSIA) PCECILOSTICTA, Pfeiffer. 
Helix pceciloiticta, Pfr., P.Z.S., 1851 ; M.PI.V., vol. 3, p. 59 ; vol. 5, 
p. 89, No. 301. 
Shell perforated, trochiformed, thin, closely plaited, fulvous, rufous- 
spotted, diaphanous ; spire convexly-conical, apex rather acute; suture 
margined ; whorls, 5J, narrow, somewhat convex, the last keeled, not 
descending, flat beneath ; aperture a little oblique, depressed, angularly 
lunar; peristome simple, straight, columellar margin ascending, callously - 
reflexed. 
Diam., 4 ; height, 3^ mill. 
Hab., New Zealand. 
HELIX (CIIAROPA) IOTA, Pfeiffer. 
Helix iota, Pfr., P.Z.S., 1851 ; M.H.V., vol. 3, p. 69 ; vol. 5, p. 114, 
No. 465. 
Shell perforated, sub-depressed, thin, closely ribbed, not shining, 
yellowish-horny, rufous spotted and reticulated ; spire shortty-conoidal, 
somewhat acute ; whorls 5, rather convex, gradually increasing, the last 
not descending, rounded : aperture a little oblique, rotundly-lunar; 
peristome simple, straight, margins distant, columellar margin arcuately 
ascending, sub-dilated above, open. 
Diam., greatest, 4 ; least, 3|; height, 21 mill. 
Hab., New Zealand. 
HELIX (CHAROPA) DIMORPHA, Pfeiffer. 
Helix climorpha, Pfr.. P.Z.S., 1851; M.H.V., vol. 3, p. 68 ; vol. 5, 
p. 114, No. 457. 
Shell perforated, depressed, thin, very closely striated and somewhat 
closely so with thread-like ribs, a little shining, diaphanous, pale horny, 
minutely rufously-tessellatcd, and at the suture ornamented with rufous 
spots ; spire scarcely elevated ; whorls 5, rather convex, the last not 
descending, rounded, higher than broad ; aperture.sub-vertical, lunar ; 
peristome simple, straight, with the basal margin somewhat bent 
