S.A. NAT., VOL. XV. 
| Nov. 30th, 1933. By Bernard. C. Cotton and F. K. Godfrey. 19. 
South Australia it is not uncommonly reported from Yorke Pen¬ 
insula, and to the westward, but is elsewhere rare. Also West¬ 
ern Australia—-Esperanto, Albany, Ellensbrook, Bunburv, Rott- 
nest Island, where it is less common than //. roei Gray, but yet 
not rare, measuring up to 115 x 92 mm. //. scalaris is irregularly 
oval, depressed, rather thin; with a strong rounded ridge inside 
of the row of elevated tubular holes, and a smaller, nodose ridge 
outside of it; above finely striated spirally, and with coarse 
raised lamellae between the spire and the inner spiral rib; colu- 
mellar plate narrow; inside silvery and very iridescent, with ex¬ 
cavations corresponding to the elevations of the outer surface; 
open holes five or six. There appears to be no doubt of the 
identity of South Australian examples, but in Western Australia 
the sculpture becomes more strongly pronounced, the spiral rib 
I very prominent, the axial lamellae higher and more vertical, and 
the holes more tubiform. 
H. emmae Gray 1846. PI. 1, fig. 6. Rounded, ovate-depress¬ 
ed, having a low convexity (scarcely a rib) on the upper surface 
parallel with the row of holes, and numerous lamellae radiating 
lrom the spire; sculptured throughout with fine spiral cords; open 
holes six. Length 47, breadth 34, height 10 mm. Larger 
specimen 80 x 70 x 20 mm. South Australia, Edithburgh, 
St Francis Island, Point Sinclair, Glenelg River, Kings¬ 
ton, Guichen Bay. (Type locality-—Australia). The spec¬ 
ies is short oval, right, margin straighter than the left; colour 
orange-red, with wide rays of lighter; outside of the row of holes 
there are numerous descending stripes alternately darker and 
lighter; upper surface has a low wide spiral rib with oblique un¬ 
dulations or folds upon it which take the direction of tangents 
from the spire; between this and the spire there arc numerous 
radiating raised lamellae-like pinched-up folds taking the dir¬ 
ection of growth-striae; entire surface has acute growth striae, 
appearing as little scales on the fine rounded spiral cords; there 
is a channel outside of the row of holes; inside silvery iridescent; 
columellar shelf narrow, flat; perforations low-tubular. Agrees 
with H . scalaris Leach, in having radiating lamellae or folds. 
H. cyclobates Peron 1816. PI. 1, fig. 7. (= H. excavata 
Lamarck 1822). “The Round-back Haliotis” Nearly circular, 
very convex; spire decideiy elevated, somewhat turbinate, proto¬ 
conch distant from margin about one-third or one-fourth the 
greatest diameter of the shell; colour consists of broad radiating 
patches, or oblique stripes, of chestnut, green, and flesh colour 
