104 Transactions. 
Calliostoma undulatum n. sp. (Plate 10, fig. 5, a, b.) 
Shell conical, imperforate, rather fragile. Protoconch lost and spire 
covered with callus which does not extend over the parietal wall, basal 
notch slight. 
Height, 11 mm. ; width, 9:5 mm. (Imperfect paratype.) 
Both specimens are from Castlecliff, near Wanganui, and are in Dr. P. 
Marshall’s collection. The better-preserved one is chosen as holotype. 
The species is very close to C. pellucidum Val., which differs, among other —. 
things, in its coarsely-ribbed periphery and sharper outlines near apex. 
but the lowest rib on the later whorls is practically smooth. Also, for - 
adult specimens of about eight whorls, C. ei is twice the size of 
C. suteri fragile, and has a straight and much more callused columella. 
. ponderosum (Hutt.) has three, increasing to about six smooth spirals, 
and is a much larger shell than any others in the group. (For com- 
parisons with C. acutangulum Sut. see remarks under the diagnoses of 
