200 Transactions. — Zoology. 



Genus Gerontia, Hntton. 

 Shell depressed, widely urnbilicated, striated; periphery rounded ; whorls 

 about five, slowly increasing ; aperture oblique. Mantle included. Jaw 

 smooth, striated. 



G. PANTHERINA, Hllttoil (1882). 



Shell striated with membranous plaits. Horny brown. Diameter -37 

 inch. Dentition, 24-1-24. 



South Island. — Greymouth (Helms). 



G. cordelia, 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 4|— 5-J regularly increasing whorls, subperforate. 



P. cressida, Hutton (1883). 



Shell olive horny, striated ; suture deep, spire convex. Dentition 

 about 35-1-35. 



North Island.— Wellington (T. W. Kirk). 



South Island. — Preservation Inlet (F.W.H.) ; Haast Eiver (Haast) ; 

 Southland (G. M. Thomson) ; Greymouth (Helms). 



Stewart Island (T. Kirk). 



P. guttula, 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 urnbilicated, depressed, ribbed, usually with hairs ; periphery 

 rounded. Jaw with flat ribs. Marginal teeth broad, usually with many 

 points. 



C. ida, Gray (1849) ; H. zic-zac, Gould (1848) (?). 



Spire flat ; umbilicus perspective ; whorls with distant hairy ribs, about 

 12 hi the tenth of an inch, and distant slight spiral membranous ridges, 

 especially on the lower surface. Diameter "33 inch. Dentition,. 22-1-22. 



North Island. — Auckland (Greenwood, Cheeseman, Gillies) ; Napier ; 

 Wellington. 



