829 Transactions, —Geology. 
Length, :8 inch (?, specimen broken) ; breadth, +12 inch. 
Locality. Petane. 
Scalaria corulum, | Pl. xviii., fig. 22. 
Shell minute, ovate, slightly perforated. ^ Whorls 5, very convex, the 
two first smooth, the others longitudinally ribbed; about 99 to 94 ribs in a 
whorl; the interstices finely spirally lined ; suture deep ; body whorl rounded. 
Aperture roundly ovate, the peritreme continuous. 
Length, -06 inch. 
Locality. Wanganui. 
Zizyphinus ponderosus. 
Shell large, solid. Whorls 5 or 6, flattened, the periphery roundly 
angled ; with distant smooth spiral ribs, which are closer together on the 
posterior part of the whorls; suture distinct ; base with about 12 fine spiral 
ribs. Aperture rhomboidal, the umbilical callus large. 
Length, 1:4 inch; breadth, 1-7 inch. 
Locality. Wanganui. 
Differs from Z. decarinatus by the periphery being more rounded, the 
base not so flattened, and the umbilical callus larger, as well as in the 
whole shell being much thicker. 
Hemimactra crassa. 
Shell trigonal, sometimes nearly as high as long, massive, inequilateral, 
rather rudely concentrically striated. Anterior dorsal margin straight, or 
slightly concave; posterior dorsal margin slightly convex, larger than the 
anterior margin, the posterior slope barely keeled ; ventral margin curved. 
Left valve with a single strong elongated lateral tooth on each side. Right 
valve (?). Pallial sinus very shallow and rounded. 
Length, 1-6 inch ; height, 1:4 inch. 
Locality. Wanganui. 
Tellina angulata. 
Shell ovato-trigonal, transverse, compressed, inequilateral, anterior end 
longer, regularly concentrically grooved. Posterior end truncated, and with 
a well marked fold on the left valve, Anterior dorsal margin convex, the 
Tellina retiaria, 
Shell ovato-trigonal, compressed, sub-equilateral, the anterior end shorter, 
finely and rather distantly concentrically lamellated, and decussated with 
radiating lines. Posterior fold obsolete, Anterior dorsal margin slightly 
