107 
S.A* NAT , VOL. XV. 
Sf.pt. 20th , 1934. By Bernard C . Cotton and F . K . Godfrey. 
Thalotia Gray 1847 (subgenus.) Shell imperforate, ele¬ 
vated-conical, thick, solid, granulated or spirally ribbed; peri¬ 
phery rounded or obtusely angular; aperture small, ovate; outer 
lip thick, crenulated within; columella toothed at base, subtrun¬ 
cated. Type'— Monodonta cornea Gray 1826. In addition to the 
type— conicus Gray—we include neghetus 'Fate, chlorostoma 
Menke, blandianus Crosse, and abnormis Crosse. 
Proihaiotia Thiele 1930 (subgenus). Shell conical, thick, 
very narrowly perforate, columella smooth, concave, truncate be¬ 
low. Type— C. flindersi Fischer. With this may be grouped 
the South Australian species freycineti Fischer, baudini Fischer, 
decoratus Philippi. 
C. pulcherrimus Wood 1828 ( Trochus ) (= T. preissii 
Menke 1843: = T. piiella Philippi 1851: — Thalotia mariatr 
Tenison-Woods 1877). PI. 1, fig. 1. “The Fairest Canthari- 
dus.” Shell imperforate, acutely conical, elongated, thick, solid; 
spire straightly conical, apex subacute, sutures linear; whorls 
about six, neary flat, the penultimate with four or five broad 
Hat spiral ribs, often unequal in width, separated by narrow im¬ 
pressed grooves, the bod}- whorl subangular, with four or five 
broad fiat lew ribs above the periphery and more numerous 
narrower ones on base; ribs usually purplish-crimson articulated 
with narrow white marks; aperture small, less than half the 
length of shell, oblique, oval, brilliantly iridescent and somewhat 
sulcated inside, peristome edged with a line of intense crimson, 
bordered with greenish inside; columella vertical, slightly arcuate, 
straight in the middle; parietal wall covered by a light callus. 
Height 14, diam. 9 mm. Beach, fairly common. Middleton, 
Glenelg (Gulf St. Vincent) to Geraldton (Western Australia). 
(Type locality—Southern Australia. We designate Encounter 
Bay). 
C. lehmanni Menke 1843 {Trochus) . PI. 1, fig. 
“Lehmann’s Cantharidus ” Imperforate, elongated conical, sol¬ 
id; whitish, or a little tinged with olive, with numerous rather 
narrow long olive-brown stripes, usually broken into tessellations 
at the base; spire long, protoconch subacute, whitish; sutures 
moderately impressed; whorls about seven, flat or concave below 
the sutures, convex and swollen at the periphery and above each 
suture, encircled by numerous fine lirae; last vvhoil a tiillc dc- 
tfexed’at the aperture, often subangular at the periphery; aper¬ 
ture rhomboidal, less than half the total length of shell; peris ¬ 
tome rather thin, acute, edged by a row of red dots, thickened 
a little distance within, the thickening finely crenulated; colu¬ 
mella vertical, marked with crimson at the outer base. Height 
13 ? diam. 10 mm. Beach, not uncommon, and generally distri¬ 
buted, from Robe (South Australia) to Geraldton (Western 
