TO 
/ 
South .} ust rdhiin Shrlls. 
S.A. NAT., VOI.. XIV. 
Ma’.. 1933. 
contracted; spirally striate and banded with spiral lines of opaque 
.be}’ond the spire and towards the axis, anteriorly; pyriform, 'i'he 
sliell ma}' be smaller, more oval — little or not at all centrally 
contracted; spiral)’ striate and banded ^\■ith spiral lines of opaque 
■wliitc square spots. Another form is scarcely, if at all, inflated 
Ixdow. The shape may be fusiform, narrowed posteriorU- and 
the backwards prtjjcction of outer lip anitular. 
Rhizorus Montfort 1810. Small, solid; ovately-cylindrical, 
nvith oblique, sunken spire; mouth longer than the bod\’ of the 
■■shell, narrow, entire .somewhat dilated at both ends; outer lip 
much prolonged, medially straight, sharp, turning into the cavity 
■of the spire. Type — acldaidis Montfort (Italy). Many auth- 
'ors give Rhizorus as a synonym of Vnhvula A. Adams. Wc think 
tl:is is probabh* incorrect as Voknda is one of the OzmJa forms. 
R. rostratus Adams 1850. PI. 1. fig. 7. “The Beaked 
Rhizorus.” Elongaiely oval, beaked at both ends; white, pellu- 
cid; axially sub-striated, spirally very minutely striated; mouth 
:narrow. linear; outer lip equall)^ arched; columella tortuous with 
a single fold. Height 7, diam. 2.6 mm. Fairly common and 
‘gencralK' distributed from Bcachport S.A, to King Ccorge Sound 
and Hopetoim W.A. — beach and down to 104 fathoms. (T)'pe 
.local!t^■ — Port Lincoln, S. Aus. Mus. Metcalfe). 
R. tragula Hedley 1903 (Volviila). “d’he Drag-net Rhiz- 
oius,” from its net-like sculpture. Thin, oblong-acuminate; milk- 
white; spiral grooves, fine, medially almost effaced, posteriorly 
about half-a-dozen are deeply incised; axial growth lines faint; 
mouth as long as the shell, posteriorly it narrows to a canal, 
anteriorly is broad and effuse; inner lip terminates below in a 
spike; columella forms at base a broad car-shaped lobe, with a 
thickened edge. Height 4, diam. 1.65 mm. Gulf St. \ inceiit, 
Spencer’s Gulf. Tourville Bay. (fryne locality— Port Kcmbla 
N-S.^V. 63-75 fathoms). The South A'ustralian shell is probably 
•cither a variant or distinct species. More specimens are neces- 
sary to determine this, fledley records a series in the Australian 
Aluseum, Svdne^^, giving the species a range of sixteen degrees 
■cf latitude. 
RINGICULIDAE. 
Short, ventricose, spire conic of several whorls; mouth narrow, 
obstructed by folds on tlie columellar margin; outer lip thicken- 
ed outside, often dentate within. operculum. Distribution 
Tropical and subtropical. Fossil — Cretaceous. Animal complete- 
retractile within the shell, foot short, head-disc wide, prolonged 
backward in the middle, a sort of siphon being formed by the 
rolled-in margins. 
