114 
South Australian Shells. 
but is without the acutely carinated periphery; the columella, 
as in chlorostoma, is sharply defined by a coincident umbilical 
depression. The species differs by the absence of the supra-sut- 
ural carina, its slightly convex whorls, and less elevated spire. 
The eight whorls have the spiral and axial sculpture as in chlor¬ 
ostoma ; colour usually brown or yellowish, spotted with white or 
brown-white blotches, and more or less with white and brown 
above the suture and on the periphery, rarely unicoloured (green¬ 
ish-yellow). Adult specimens, as shown by the thickened outer 
lip bevelled to a sharp edge, have been dredged in life on Trou- 
bridge Shoal (St. Vincent Gulf) in six fathoms by Matthews. 
The animal of specimens taken in Gulf St. Vincent may be des¬ 
cribed as follows:— Foot, light brown, unicoloured underneath; 
sides speckled with darker brown, the mantle edges white speck¬ 
led with brown; tentacles long, one half or one third as long as 
foot, articulated white and reddish brown. Verco took it abun¬ 
dantly, in St. Vincent and Spencer Gulfs in from five to fifteen 
fathoms. Height 18, diam. 15mm. (Type locality—Gulf St. 
Vincent). We present Tate’s description and remarks, but when 
a large series is examined the differences become superficial and 
we regard it is a variant of C. chlorostoma. It is found from 
Yankalilla Bay (South Australia) to Rottnest (Western Aus¬ 
tralia) and this form is more common than typical chlorostoma 
in South Australia. Not recorded from Victoria or Tasmania 
in either form. 
C. chlorostoma Menke 1843 ( Trochus ). Imperforate, coni¬ 
cal, elevated-trochiform, solid; protoconch red; the following whorls 
ieddish-brown, more or less tinged with buff, and in places with 
olive-green, and sparsely maculate with whitish, the spiral ribs 
more or less minutely articulated with whitish; whorls eight to 
nine, flat or slightly concave, acutely carinated, the carina slightly 
projecting above the Sutures; upper surface of each whorl en¬ 
circled by ten to twelve spiral lirae, only slightly elevated, and 
with strong regular oblique striae of increment in the fnterliral 
interstices; base flat, with about ten concentric narrow lirae, 
strongly, regularly radiately striate; aperture rhomboidal, very 
oblique, iridescent and sulcate within; outer and basal lips edged 
with green, plicate-denticulate within: columella curved, ending 
in a strong tooth at base, green. Height 24, diam. 20 mm. (Type 
locality—Western Australia). Corny Point 24 x 23 mm. (Cot¬ 
ton). Gulf St. Vincent and Spencer Gulf, rare. Alive, 9 fath¬ 
oms, off East Cove, Kangaroo Island (1891). Westward to Es- 
perance, Rottnest and Geraldton, W.A. Peculiar in the ele¬ 
vated straightly conical form, carinated periphery and coloura¬ 
tion. There is both a narrow and wide form. 
