192 Transactions.— Zoology. 
Its reported occurrence in Tasmania is incorrect. 
P. Lucerra, Hutton (1883) ; H. coma, Pfeiffer [not of Gray]. 
Ribs rather distant, about 15 in the tenth of an inch ; spire convex ; 
. periphery obscurely angled. Pale brown, obscurely spotted. Diameter 
‘28 inch. Dentition, 14-1-14. 
North Island.—Hawke's Bay (Colenso); Wellington (F.W.H. ). 
P. vanrcosa, Pfeiffer (1854). 
Umbilicus moderate ; spire slightly elevated, finely striated and “ vari- 
cosely angled with distant ribs." Fuscous. Diameter ‘14 inch. 
New Zealand (Strange or Cuming) | 
I have not been able to make this species out. 
P. succmeLLA, Reeve (1852); P. gamma, Pfeiffer (1851). 
Ribs close, about 80 in the tenth of an inch; spire flat. Pale brown, 
banded or clouded with dark brown. Diameter :14 inch. Dentition, 
10-1-10. 
North Island.—Auckland Boes n Gillies) ; Polen, near Napier. 
South Island. —Dunedin (F.W 
P. cornicuLum, Reeve (1852); = 3 Mi, Pfeiffer (1851); not H. corniculum, 
Hombron and Jacquinot (1854). 
- Ribs very close, about 40 in the tenth of an inch. White, silky. Dia- 
meter ‘14 inch. Dentition, 14-1-14. 
North Island.—Auckland (Cheeseman, Gillies) ; Petane, near N apier. 
South Island.—Oxford and Christchurch (Chilton), 
P. BIANcA, Hutton (1883). 
Minute. Ribs very close, about 55 in the tenth of an inch. Horny 
brown, banded with darker. Diameter +1 inch. 
North Island.—Auckland (Cheeseman) ; Horokiwi, Wellington. 
South Island.—Greymouth (Helms) ; Bealey (Haast). 
P. ANGUICULA, Reeve (1852) ; H. theta, Pfeiffer. 
Ribs close, about 88 in the tenth of an inch; aperture subcircular. 
Dark brownish with rufous streaks. Diameter -10 inch. Dentition, 11-1-11. 
North Island.—Auckland (Cheeseman). 
South Island.—Greymouth (Helms); Oxford (Chilton). 
Auckland Islands (H. Krone), 
B. Ribs on upper surface sinuated. 
P. rimanpra, Hutton (1883). 
Ribs distant, about 18 in the tenth of an dk Brown, obscurely 
banded with paler. Diameter :12 inch. 
North Island.—Auckland (Cheeseman, Gillies) ; Horokiwi, Wellington. 
P. sessica, Hutton (1883). 
Ribs close, about 35 in the tenth of an inch. Dark reddish brown, 
marked with horny. Diameter ‘17 inch. 
