26 
Fam. Cerithiidae. 
Cevithidea bicavinata (G r a y). 
North Island: 8, many sps., h. 25. 
Cerithidea subcarinata Sowerby. 
North Island: 7, some sps., h. 11.5. — 19, on Corallinae, 
numerous small sps., h. 13. 
Cerithidea tvicavinata H u 11 o n. 
North Island: Ild, 1 sp., h. 12. — 12, numerous sps., h. 14. 
— 15, 1 sp., h. 12. 
Cerithium invaricosum n. sp. 
(PI. I, fig. 15.) 
Shell turreted-conic, light fawn-coloured with a violet band below 
the suture. Whorls 9, slightly convex; suture deep, broadly cana- 
liculate. Protoconch of 2 1/2 whorls, smooth, brown, the next whorls 
reticulate, with three spiral cords and radial ribs of the same breadth; 
on the penultimate and last whorl 22 longitudinal ribs and 5 flat- 
tened spiral cords appearing only in the interstices between the 
ribs; base with 8 spiral cords (and neck with 2 additional ones) 
the uppermost (peripherial) one strengest and limiting the ends of 
the ribs which are not continuous on the base. Aperture rounded 
square with a very short oblique canal notched in the end. Co- 
lumella perpendicular. Outer lip simple, inner lip reflected; a very 
narrow umbilical fissure at the columella. Dimensions: H. 9, br. 
4, h. of aperture 2.8, h. of last whorl 4.7 mm. — Locality: North 
Island: 11b, 1 empty shell. — The total absence of varices and 
the reticulate sculpture give this species an appearance like a 
Cerithidea. 
Fam. Cerithiopsidae. 
Cevithiopsis canaliculata Suter. 
North Island: 16, 1, h. 4. 
Cevithiopsis divempta n. sp. 
(PI. I, fig. 16.) 
Shell small, biconical, with convex outlines. Whorls 8 (except 
% 
the broken protoconch), flat; suture indistinct, impressed and mar- 
