200 Transactions.—Zoology. 
Genus Gerontia, Hutton. 
Shell depressed, widely umbilicated, striated; periphery rounded ; whorls 
about five, slowly increasing; aperture oblique. Mantle included. Jaw 
smooth, striated. 
G. PANTHERINA, Hutton (1882). 
Shell striated with membranous plaits. Horny brown. Diameter ‘37 
inch. Dentition, 24-1-24. 
South Island.—Greymouth (Helms). 
G. corpeLIA, Hutton (1883). 
Shell striated but not plaited. Pale horny marbled with reddish brown. 
Diameter :32 inch. * 
North Island.—Auckland (Cheeseman, Gillies). Apparently allied to 
Helix tiara, Mighels, from the Sandwich Islands. 
- Genus Pyrrha, Hutton. 
Animal heliciform, mantle sub-central, reflected over the peristome with 
an even margin: tail truncate, with a large papilla and mucous gland. 
Jaw with flat ribs. Marginal teeth broad, with several points. Shell thin, 
translucent, of 44-54 regularly increasing whorls, subperforate. 
P. cressipa, Hutton (1888). 
Shell olive horny, striated; suture deep, spire convex.  Dentition 
about 85-1-85. 
North Island.—Wellington (T. W. Kirk). 
South Island.—Preservation Inlet (F.W.H.); Haast River (Haast) ; 
Southland (G. M. Thomson); Greymouth (Helms). 
Stewart Island (T. Kirk). 
P. curtuLa, Pfeiffer (1853). 
Shell rather solid, subperforate, smooth, spire convex, suture incon- 
siderable, columella thickened. Pale yellowish horny. Diameter ‘7 inch. 
North Island.—Mountains near Masterton (T. W. Kirk). 
The animal and dentition are unknown, consequently it is referred here 
with doubt. 
Genus Charopa, Albers. 
Shell umbilicated, depressed, ribbed, usually with hairs; periphery 
rounded. Jaw with flat ribs. Marginal teeth broad, usually with many 
points. 
C. wa, Gray (1849); H. zic-zac, Gould (1848) (?). 
Spire flat; umbilicus perspective; whorls with distant hairy ribs, about 
12 in the tenth of an inch, and distant slight spiral membranous ridges, 
especially on the lower surface. Diameter ‘88 inch. Dentition, 22-1-22, 
North Island.—Auckland (Greenwood, Cheeseman, Gillies); Napier; 
Wellington, 
