S.A. NAT., VOL. XV. 
Nov. 30th, 1933. By Bernard C. Cotton and F. K. Godfrey. J7. 
wrinkled; columellar plate rather wide, sloping inward, flattened, 
obliquely truncated at base; cavity of spire large; rather shallow; 
perforations unusually small, their borders not raised outside. 
//. albicans is our largest species and appears to inhabit deeper 
waters than most of our other species. It is distinguished by the 
delicate rayed style of colouring, the more than usually small 
perforations, and the minute wavy pattern on the silvery interior. 
Specimens taken in Gulf St. Vincent are usually white, but those 
taken on Yorke Peninsula have the striped colouration. 
H. naevosa Martvn 1784. PI. 1, fig. 4. (= H. clathrata 
Reeve: = H. naevosum improbulum Iredale 1924). “The Warty 
HaliotisV Rather large, rounded-oval, much depressed, distance 
of protoconch from margin one-fifth length of shell; spiral cords, 
f'ne, cut by close, minute, growth lines, and having radiating 
waves or folds above; a slight angle at the row of holes, below 
the angle broadly excavated and then keeled; holes about six, 
elevated, circular. Length 120, breadth 90, height 28 mm. 
Common, on rocks at low tide, all along the South Australian 
coast from the Glenelg River to St. Francis Island. Not recorded 
from Western Australia. (Type locality—New South Wales). 
1 his is one of our most common mutton-fish, its outline is sub- 
orbicular, much depressed: solid but not thick; either dark red 
with few radiating angular white patches, or dull red and green, 
streaked and mottled; the spiral cords are either nearly equal, 
or have slightly larger ones at wide intervals; the cords are de¬ 
cussated by close growth striae; whorls about three; columellar 
plate broad, flat, obliquely truncated at the base; inside corrugated 
like the outer surface, silvery, very brilliantly iridescent, the 
reflections chiefly sea-green and red; cavity of spire wide, open, 
but shallow. 
H. ro«i Gray 1827. PI. 1, fig. 3. (—If. scabricosta Menke 
T'43: not II rugosa-plicala Chemnitz). Short-oval, protoconch 
horn nearest margin about one-fifth the length of shell; scarlet- 
ted, more or less marbled with olive-green, with broad white 
rays; spiral cords, strong, unequal crossed by radiating folds; 
epen holes usually eight, nearly circular, rather small. Length 
^5, breadth 58, height 23 mm. Not uncommon at Corny Point. 
O^orke Peninsula) but rarer at other stations, Guichen Bay, En¬ 
counter Bay, Port Willunga. Edithburgh, Arno Bay, St. Francis 
bland. Beards Bay. This is by much the most common IIaliotis 
in Western Australia, where it may be 100 x 82 mm; it appears 
Lu have come around from the west along the southern coast of 
Australia, and reached Guichen Bav (Verco). (Type locality 
