16 . 
South Australian Shells. 
R.A. NAT,, VOL. XV. 
Nov. 30th, 1933. 
the position of the spire; the colour of the inside; smoothness 
or roughness of the muscle-scar; width and slope of the columel¬ 
la r plate; and within rather wide limits the number of open 
holes (Pilsbry). It is convenient to divide the numerous spec¬ 
ies of Haliotis into groups and for our Southern Australian Mut¬ 
ton-fish we suggest the following, which may, if desired, be con¬ 
sidered as subgenera. 
Schismotis Gray 1856 (Subgenus). Oval, evenly convex, 
the two sides equally curved; almost smooth, having obsolete fine 
spiral striae; not carinated at the row of holes; cavity of spire 
large, not concealed; nacre silvery; muscle-scar not distinct; holes 
very small, not tubular. Type— H. excisa Gray (a deformed al¬ 
bicans). II. albicans Quoy & Gaimard, belongs here. 
Notohaliotis (subgen. nov.) Shell rounded, flattened, spire 
large; spiral striae (sometimes obsolete) and usually radiating 
waves; keel at the row of holes; inside silvery. Type—//. nae- 
vosa Martyn. YVe also add II. rod Gray and II. conicopora Peron. 
Neohaliotis (subgen. nov.) Upper surface closely spirally 
•triated; spiral rib strong, rounded, inside the row "of holes; 
raised lamellae between spire and inner spiral rib. lype— H. 
scalaris Leach. H. emmae Gray, is related. 
Exohaliotis (subgen. nov.) Shell subcircular, very convex, 
spire subcentral and comparatively extremely elevated; spirally 
lirate and ^radiately folded, hype— H. cyclobates Peron. 
H. albicans Quoy & Gaimard 1834. PI. 1, fig. 1. (= Schis¬ 
motis excisa Gray, a monstrosity. Iredale considers the name to 
be H. laevigata Donovan 1808, based onlv on a drawing). “The 
Whitened Haliotis.’ Large, oval, distance of protoconch from 
margin one-sixth to one-eighth the length of shell; orange or 
orange-scarlet, radiately striped with continuous white flames; 
nearly smooth but with obsolete spiral lirae; perforations very 
small. Length 174, breadth 129, height 40 mm. A specimen 
in Mr. \Y . ]. Kimber's collection measures 196 x 157 x 60 mm. 
Along the coast of South Australia from Glenelg River to St. 
brands Island, not uncommon, cast i\p after storms with kelp 
attached. Also Western Australia (King George Sound. Type 
locality—upon rocks at the entrance). Right and left margins 
about equally curved; back convex, rounded, not angufated at 
the row of holes; rather thin; colouration consists of continuous 
oblique stripes of scarlet and whitish; surface sculptured with 
nearly obsolete spiral threads and cords; spire moderately elevat¬ 
ed, whorls about two-and-a-half; inside silvery, nacre almost 
smooth, but showing traces of spiral sulci, and very minutely 
