19 . 
S.A. NAT.., VOL. XIV. 
November, 1932 . By Bernard C. Cotton and F. K. G odjrey. 
convex; suture fairly impressed; mouth about onc-tliird of length 
of shell, elongate oval, broadly rounded below, slightly effuse; 
outer lip’ thin, thicker within, somewhat flattened towards the 
suture; inner lip reflected over a slight umbilical chink. Height 
2, diam. .75 mm (Type locality — Phillip Island, Western Port,, 
Vic. in shell sand from 4 fathoms, 
Opimilda Iredale 1929. Short, squat, umbilicated ; spiral 
arid axial riblets, well marked; protoconch paucispiral bulbous, 
smooth, set almost at right angles to the rest of the shell; mouth 
subquadrate; outer lip simple; columella expanded anteriorly, 
meeting the lip at an angle. Type — Mathilda decor ata Hedley 
1903. 
O. decorate Hedley 1903 {MathUa), PI. 1, fig. 4. “The 
Decorated Opimilda.” Broad, tiuTcted; pale-brown; two spiral 
projecting keels on the periphery mount the spire, with two 
minor cords above them, and one plain cord bordering the suture; 
axial riblets about twenty-five arise, outside the basal border and 
mouth, perpendicularly to the summit of the shell; these produce 
a bead at each point of intersection with the four spirals and 
cut their interstices into square meshes; spiral threads few, fine, 
on the otherwise smooth base, which is bounded by a double 
smooth cord; protoconch large, of more than one whorl, smooth, 
set on edge at one side of summit; adult whorls foyr-and-a-half; 
outer lip’ dentate by the sculpture; umbilicus, a chink. Height 
4.25, diam. 2 mm. Dredged Cape Wiles 100 fathoms. (Type 
locality — Port Kembla N.S.W. 63-75 fathoms), 
Cioffulina Adams & Angas 1860. Tapering, turreted, whorls 
numerous, spirally ribbed, interstices sculptured; mouth somewhat 
oblong, rounded below; outer lip sharp, curved; inner lip straight, 
simple. Type — C. cirexnata A. Adams (Japan). This genus 
most nearly resembles Monoptygma in form and sculpture; but 
in the straight inner lip and absence of parietal fold it is like 
Turbonilla. The spiral ridges suggest Adis, but the form of the 
mouth is very different. 
G. spina Crosse & Fischer 1864 (Turritella) (= Adis fm- 
triata Tenison-Woods 1876). PI. 1, fig. S. “The Thorn-like 
CinguHna.” Small, conical, turriculate, regular, not umbilicated; 
white; spiral ribs, three, strong, rounded; last whorl bears a 
fourth rib finer than the others, near the base, which is smooth: 
whorls numerous, flat, increasing slowly; suture Indistinct; mouth 
somewhat quadrangular; outer lip simple; inner lip short. Height 
14, diam. 3.4 mm. Robe to American River (Kangaroo Island) 
and Smoky Bay, beach and down to 130 fathoms. Not common. 
Also Albany to Bunbury W.A., 22 fathoms. (Type locality — 
