Fintay.—New Zealand Calliostomidae. 105 
The eight members of this group can be tabulated thus :— 
A. With three main spirals on most whorls 
(a.) Spirals smooth, shell large .. ae x -. С. ponderosum. 
(6.) Spirals nodulous : 
(i.) Axials very conspicuous, cancellating the spirals .. С. cancellatum. 
(ii.) Axials inconspicuous : 
Periphery with several fine, blunt riblets below 
a stronger, nodulous rib .. Uu .. C. undulatum. 
Periphery with one smooth, sharp rib .. C. hodgei 
B. With four main spirals on most whorls : 
a. ire concave, especially in lower whorls, sculpture delicate С. suteri var. 
(5.) Spire straight or lightly ecnvex : [ fragile. 
(i.) Suture marked, nodules on third rib most numerous C. acutangulum. 
(ii.) Suture inconspicuous : 
Nodules on the two lowest ribs in the ratio 2:3, 
spire high as in Canthar T 2 С. marwicki, 
Nodules on the two lowest ribs subequal in 
number, spire-angle much wider .. -. C. suteri. 
the component members of the group will be of use for zonal purposes, for 
the author has not at present sufficient material from enough localities to 
List or PAPERS CITED. 
MARSHALL, P., 1915. Cainozoic Fossils from Oamaru, Trans. N.Z. Inst., vol. 47, 
pp. 377-87. 
and Оттікү, G. H., 1913. Some Localities for Fossils at Oamaru, Trans. N.Z. 
Inst., vol. 45, pp. 297-307. 
—— — 1914. Localities for Fossils near Oamaru, Trans. N.Z. Inst., vol. 46, 
рр. d 
Park, J., 1918. The Geology of the Oamaru District, N.Z. Geol. Surv. Bull. No. 29, 
Srricut, R., 1917. The Stratigraphy of the Tertiary Beds of the Trelissick or Castle 
ill Basin, Trans. N.Z. Inst., vol. 49, pp. 321-56. : 
ТГномѕох, J. A., 1920. The Notocene Geology of the Middle Waipara and Weka Pass 
District, Trans. N.Z. Inst., vol. 52, pp. 322-415. 
