84. 
S.A. NAT., VOL. XV. 
By Bernard C. Cotton and F. K. Godfrey. June 12th, 1934. 
purplish neutral tint above. Four purplish cilia on each side. 
Two stout tentacles with the eye just outside the base. 
C. yatesi Crosse 1863. PL 1, fig. 5. “Yates 5 Clanculus. 55 
Rather deeply and very narrowly umbilicated, conical, solid, 
rather thick; white, with numerous spots of carmine red. which 
at times become confluent; spirals with granular zones, forming 
as it were series of small pearls, obliquely and very finely striated 
in the parts which separate the zones; suture rather distinct; 
protoconch of two whorls, white, smooth; adult whorls about 
three, flat; penultimate, also last whorl, have each five granular 
zones, the ones nearest the suture being larger, and more pro¬ 
jecting than the others, which renders the spire slightly stair-like; 
last whorl angular, rather flat on the basal side, with six rows of 
granulations around the umbilicus; aperture oblique, somewhat 
square, nacreous, ridged within,the ridges cease before reaching 
the outer margin, and form at the point where they stop, small 
denticulations; umbilicus white, surrounded by granulations; col¬ 
umella rather wide, with two folds, one near the umbilicus and 
inconspicuous, the other much stronger, weakly bifid; basal mar¬ 
gin with some obsolete granulations; outer lip thickened, but only 
inside, and its edge almost acute. Height 8, greatest diann 11, 
least 9.5 mm. Rather common, beach, all along the South Aus¬ 
tralian coast, and dredged alive to 22 fathoms. Also Western 
Australia—Bunbury Beach. (Type locality—Gulf St. Vincent). 
Crosse, at the same time, described— Far. B ; A little larger, 
more depressed, suture more distinct and as though canaliculated, 
spots more confluent, and of a rosy colour around the umbilicus. 
Height 8, greatest diam. 13, least 11 mm. 
1 he species may be divided into a number of variants: — 
. 1. Very depressed, very gradate; gradation formed by pro¬ 
jecting supra-sutural spiral, a flat canccllaie infra-sutural sur¬ 
face, and an angulating beaded spiral; in last whorl three fine 
granose spiral threads on the slope with an intervening threadlet 
in the interstices; large carinating peripheral spiral; this and 
the angulating spiral are closely tuberculate and multispirally 
incised; base flatly convex; seven spirals, the central the largest, 
that bordering the perforation smooth, the rest granose, minutely 
curvedly radially striate. 
2. Similar, but whorls not so widely gradate; spiral threads 
larger and more largely granulate, the threadlets are granulose 
cinguli; the basal spirals are larger grained. 
3. Whorls less stepped; the infra-sutural spiral has larger 
tubercles which occupy about one half of the flat surface; the 
peripheral spiral has rather larger tubercles than 2. 
