476 * Transactions. 
11 subequal spirals on body-whorl and extending over base; interstices 
wide while the ribs are few but narrower when they are тапу ; towards 
canal ribs become fainter and smoother. Axial sculpture consists on the 
upper whorls of rather bluntly rounded ribs (about 20 per whorl) with 
considerably wider interstices, intersections with spirals raised into verti- 
cally compressed nodules, but on body-whorl axials quickly diminish in size 
and prominence and crowd together, becoming of same strength and width 
one medially, not parallel to lower one, and sometimes almost obsolete. 
Strong plait on parietal wall near outer lip, which bears a series of teeth 
some distance within aperture ; these, however, are not well developed 
unless outer lip is thickened. Inner lip spreading as a well-defined callus 
over parietal wall, part of base, and beyond columella, forming there a 
distinet cavity but no umbilicus. 
. 
Height, 7:5 mm.; diameter, 3 mm. (holotype). Height, 11 mm. ; 
ype and many paratypes, from Target Gully, in author’s collection. 
Also from Pukeuri, Ardgowan, and Awamoa Beach. 
In sculpture this shell is almost the same as A. pyramidale, and there is 
the possibility that it is only the gerontic form of this species. This might 
. explain such differences as rounded periphery, change of ornament near 
together in the same localities, are so readily distinguishable in all stages 
у shape of periphery that it seems best to treat them at present as 
distinct species. ` 
Shell fairly small, with nodulous cancellate sculpture and bluntly angled 
lip lost. Four narrow and blunt 
