50 Macieay Memoriat Vouume. 
the spire longitudinally ribbed; 15 to 20 ribs in a whorl. Suture well marked, 
not margined. Aperture oval, the canal short and broad; sinus small. Length 
9mm.; breadth 3mm. 
Locality. — Petane. 
PLEvROTOMA BUCHANANI, Hutton, Cat. Tertiary Moll. of N.Z. p. 4. 
(Plate vi. fig. 26.) 
Shell elongato-fusiform. Whorls obliquely longitudinally plaited, and with 
fine spiral ribs below the sinus area ; above the sinus area smooth, concave, with 
a slight ridge at the suture. Between 11 and 15 longitudinal plications on a 
whorl. Aperture oval, canal produced, rather bent. Length 22mm.; 
breadth 7mm, 
Locality.—Wanganui, Petane, Matapiro. 
PLevROTOMA PLICATELLA, Hutton, Trans. N.Z. Inst. Vol. XVIII. p. 333. 
(Plate vi. fig. 27.) 
Shell fusiform. Whorls spirally striated, and longitudinally ribbed below 
the sinus area, and slightly so at the suture; about 15 to 17 ina whorl. On the 
body whorl the longitudinal ribs are obsolete except at the suture; the spiral 
ribs are irregular. Aperture oval with a short canal; the sinus deep. Length 
24mm.; breadth 10mm. 
Locality.—W anganui. 
PLEUROTOMA WANGANUIENSIS, Hutton, Cat. Tertiary Moll. of N.Z. p. 4. 
(Plate vi. fig. 28.) 
Shell fusiform, the spire longer than the body whorl. Whorls strongly 
spirally ribbed, and obliquely longitudinally ribbed in the centre. From 13 to 
16 longitudinal ribs in a whorl. Suture very finely obliquely striated, and with 
a spiral rib. Aperture oval, canal short and recurved. Length 14mm.; 
breadth 5mm. 
Locality.—Wanganui, Petane, Matapiro. 
PLEvROTOMA TUBERCULATA, Kirk, Trans. N.Z. Inst. Vol. XIV. p. 409. 
(Plate vi. fig. 29.) 
Shell fusiform, the spire equal to the body whorl. Whorls keeled, strongly 
spirally ribbed, and with a row of tubercles on the keel; the suture plicated. 
