S.A. NAT., VOL. XVI. 
April IOtii, 1935 . By Bernard C. Cotton and F. K. Godfrey. 
^peripheral cord which gradates the spire; periphery acutely ang- 
ular, with a projecting rounded carina, spirally closely engraved 
*on its upper surface, axially crossed by rounded striae with about 
.sixteen rounded invalid tubercles; base flatly rounded with seven 
•concentric narrow lirae; umbilicus narrow, faintly axially incised; 
aperture oblique, roundly quadrate; outer lip slightly convex, 
thin, smooth within, margin sinuously convex below the suture, 
• concave towards the periphery; basal lip convex, slightly effuse, 
.smooth within; callus at base partly bordering the umbilicus and 
attached to the columella along a vertical groove. Operculum 
Jhorny, multispiral, nucleus central, with a radial cellular fringe- 
like film over the inner three-fourths of each spiral. Height 12, 
diam. 10 mm. Radula — 1. 5. 1. 5. 1. cc . Central rachidian 
heart-shaped, narrow free end surmounted by small, slightly 
.serrated denticle; the other rachidians with trilobed cusps, which 
gradually enlarge outwards; a single lateral with one cusp tri- 
lobed at its base; marginals many, unicuspidate, not serrated. 
Dredged — Spencer Gulf, 20 fathoms, many alive and dead. (Type 
locality — Spencer Gulf, 20 fathoms). Colour is variable. Some 
.are pinkish-brown, with white peripheral tubercles, and four 
pink cinguli on each whorl articulated with white, the larger 
white spots lying vertically between the supra-sutural tubercles, 
while narrower, oblique white spots alternate in groups with 
them. 
A. multigranum Dunker 1871 (Zizyphinus ) . PI. 1, fig. 13. 
Turreted-conic, narrowly umbilicate; light yellow; whorls eight, 
nearly plane, encircled by numerous unequal granuliferous rib- 
lets; sutural cingulus elevated, subundulate, spirally striate, pal- 
lidly tessellate, base a little convex, with about sixteen subgranose 
alternately larger and more delicate riblets; umbilicus narrow, 
surrounded by a white plate; columella oblique, terminating in 
.a pearly denticle. Height 12, diam. 10 mm. Dredged — Inves- 
tigator Straits; Gulf St. Vincent; Backstairs Passage; Yankalilla 
Bay; Western Cove; 3-22 fathoms, in weed. (Type locality — 
i Gulf St. Vincent). In some individuals the whorls are quite flat 
but for the slight projection of the sutural cingulus; in others 
the whorls are distinctly swollen and the base more convex, so 
as to make the periphery more rounded. Again, in some, the 
later whorls have the axial striae less valid and so the spiral 
lirae are less granular. 
Thiele, Die Fauna Sudwest Australiens 1930, p. 565, intro- 
duces C alliostoma excellens sp. nov. (unfigured) from Houtman 
Abrolhos. This appears to be a direct synonym of C. rubigino- 
-sum = nobile . A second species Calliostoma modestum sp. nov. 
(unfigured) from Sharks Bay, W.A., is probably a subspecies of 
C\ hedleyi. 
