454 Transactions. 
distant nodules; these show the same abrupt change in size and level as 
in A. maorium). There can be little doubt as to the relationship of this 
shell to the Recent form on the one hand, and on the other to such 
Australian Tertiary forms as C. radiale (Tate), for which Cossmann pro- 
posed the genus Austrotriton. Kesteven (Proc. Linn. Soc. N.S.W., vol. 27, 
which cannot be placed with nearly as much confidence as in the case of 
The author is of opinion that Austrotriton neozelanica M. & M. 
А. maorium. 
would be better placed in Charonia. 
Var. insignitum n. var. (Plate 51, fig. 5.) 
Differs from the species in having one sharp peripheral keel with à 
rounded base below, and much finer axial sculpture. Early whorls as In 
the species, but later ones with 9 axial ribs between varices, forming, and 
often reduced to, sharp nodules on keel. The difference in appearance 
results mainly from lack of nodules on second main cord. The change m 
size and level of nodules after a varix is much less marked in the variety, 
but the specimens are not adult. Several denticles on columella. The 
variety has a much neater appearance than the species. : 
Height, 22 mm. ; diameter, 12-5 mm. ; height of aperture, 11:5 mm. 
(type). ; Not 
Type and one paratype, from Target Gully, in author's collection. ^9 
yet found elsewhere. 
Austrotriton (?) minimum (Hutt.). (Plate 48, fig. 5.) 
The unique holotype of this species, previously supposed to be lost, pu 
been discovered by Mr. Marwick, who kindly lent it to the author tor 
examination. As Hutton’s description is so slight, and so many Wrong 
slightly above middle; shoulder sloping at about 45°, thence much more 
steeply sloping inwards to suture below; on body-whorl this a a 
almost obsolete, the whorl being subquadrately convex. Five or six Jn 
axial ribs. e very faint lower keel on base bears only traces ої n d 
Spiral cords cross whole surface, are quite prominent, flatly convex. я 
generally wider than interstices, but both vary considerably and irregularly- 
