518 GASTROPODA. [Opisthobrnnchia. 



eyes are situated. Radula wide, with many longitudinal rows of 

 teeth, all of the same form, consisting of a narrov: basal plate and a 

 crescentic reflexion. 



Shell oval, spirally striate, with conical spire and impressed or 

 channelled suture ; aperture long, half the shell's height or more, 

 narrow above, broadly rounded below, the outer lip simple and acute ; 

 columella twisted into a strong simple spiral fold ; parietal wall with- 

 out folds or teeth. Operculum corneous, shaped like the aperture, 

 few-whorled, with the nucleus near the basal margin. 



Distribution. World-wide. 



Fossil from the Upper Cretaceous. 



1. Acteon craticulatus, Murdoch and Suter, 1906. Plate 2'2, 



fig- 21. 



Actceon craticulatus, M. & S., T.N.Z.L, xxxviii, 1905 (1906), 281, 

 pi. 21, f. 6. 



Shell small, oval, whitish, subperforate, cancellated, with a basal 

 fold upon the columella. Sculpture consisting of well-impressed spiral 

 grooves of rather irregular width, with interstices of nearly the same 

 breadth, though in some specimens they are distinctly broader. This 

 spiral- sculpture is very variable. There are subequidistant axial 

 threads cutting up the spiral furrows into oblong squares. Colour of 

 most specimens (all dead shells) white ; a few specimens only show 

 purple coloration on the body- whorl, leaving a white band below 

 the suture. Spire conical, acuminate, less than half the height of 

 the shell. Protoconch paucispiral, not distinctly separated from the 

 succeeding whorl, lightly corroded in most specimens, nucleus small. 

 Whorls 5, the last of considerable size, slightly angled above, flatly 

 convex ; base narrowed and rounded. Suture deep, distinctly canali- 

 culate. Aperture sub vertical, elongated pyriform, produced at the 

 base. Outer lip sharp, very little convex, nearly straight, minutely 

 denticulate, sharply rounded at the base. Columella with a mode- 

 rately large smooth plait situated at the lower third, slightly ex- 

 cavated above, reaching the effuse basal lip in a light curve. Inner 

 lip narrow, thin. Operculum unknown. 



Diameter, 4-5 mm. ; height, 9 mm. ; aperture, 2 mm. by 5-5 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Oft' Great 'Barrier Island, in 110 fathoms : near Cuvier 

 Island, in 37 and 44 fathoms (Captain Bollons). 



Genus 2. PUPA, Bolten, 1798. 



Pupa, Bolten, Mus. Bolten. (2), 1798, 110. Type: Valuta solidula, L. 

 Solidula, Fischer de Waldheim, 1807. Dactylus, Schumacher, 1817. 

 Buccinulus, H. and A. Adams, 1858. Tornatdla of authors. 



Anatomy and dentition unknown. 



Shell ovate or oblong, solid, compact and iniperforate. with short 

 conical spire ; aperture two-thirds as high as the shell or more, narrow 



