202 Transactions. — Zouluijij. 



P. PLANULATA, Huttoil (1883). 



Spire slightly elevated ; narrowly umbilicated, the umbilicus covered ; 

 whorls closely ribbed ; ribs about 40 in the tenth of an inch. Horny 

 brown sometimes clouded with rufous. Diameter # 15 inch. Dentition, 

 11-1-11. 



North Island. — Auckland (Cheeseman). 



South Island. — Greyruouth (Helms). 



P. MiEANDA, Hutton (1883). 



Spire convex ; very finely ribbed, ribs about 50 in the tenth of an 

 inch ; imperforate or very narrowly umbilicated. Pale horny banded with 

 chestnut on the upper surface and tessellated with the same colour below. 

 Diameter -16 inch. Dentition, 17-1-17. 



South Island. — Greymouth (Helms). 



Genus Therasia, Hutton. 



Shell conoidal, depressed, periphery sub-carinated ; sub-perforate or 

 narrowly perforate ; whorls smooth, striated, or with membranous plaits. 

 Jaw with flat ribs. Marginal teeth broad, usually with several points. 



A. Sub-perforate. 



T. celinda, Gray (1849). 



Whorls with distant membranous plaits, about 10 in the tenth of an 

 inch. Pale brown. Diameter *14 inch. Dentition, 18-1-18. 



North Island. — Auckland (Greenwood, Cheeseman). 



T. Valeria, Hutton (1883). 



"Whorls strongly striated. Yellowish horny, obscurely marked with 

 reddish. Diameter *25 inch. Dentition, 26-1-26. 



South Island. — Dunedin (F.W.H.). 



T. ophelia, Pfeiffer (1854). 



Umbilicus very narrow. Whorls delicately striated ; periphery angu- 

 lated. Horny with obscure reddish streaks. Diameter '40 inch. 



North Island. — Auckland (Cheeseman). 



South Island. — Dunedin (F.W.H.). 



B. Narrowly umbilicated. 



T. tamora, Hutton (1883). 



Conical ; irregularly plaited. Brownish horny. Diameter *17 inch. 



North Island. — Auckland (Cheeseman). 



T. thaisa, Hutton (1883). 



Irregularly coarsely striated. Pale horny, variously streaked with 

 brown. Diameter # 35 inch. Dentition, 27-1-27. 



North Island.— Auckland (Gillies) ; Napier ; Wellington (T. W. Kirk). 



South Island. — Waipara (Haast, Chilton) ; Waitaki, Queenstown, Dun- 

 edin and Lake Guyon (F.W.H.); Waiau, Southland (G. M. Thomson). 



