22 . 
Sovfit Australian Shells. 
S.A. NAT., VOL. XV. 
Nov. 30th, 1933 
white, with protoconch rose: spiral threads, close, hue. on upper 
portion; spiral keels, sharp, distant, on lower; growth lines, faint, 
cross all the spirals; spire somewhat elevated; protoconch ribbed 
longitudinally; adult whorls three, early whorls rounded, last 
oval, flattened above; mouth large, oval, oblique: slit deep, well 
above the periphery, tapering to the termination half a whorl 
back, columella concave, broad, with a moderate lobe over the 
narrow umbilicus. Height 1.2, diam. 1.35 mm. Beach, Gulf St. 
Vincent. Guiehcn Bay, somewhat rare. Also Tasmania and Vic¬ 
toria. (Type locality—Twofold Bay, X.S.W.). From Scissuro- 
na rosea Hedlev (a New Zealand shell) Iredale says his Aus¬ 
tralian subspecies, S. rosea remota is “more ear-shaped, the last 
whorl longer, the earlier whorls larger, the mouth not so patulate, 
and, consequently the slit apparently higher up. The Australian 
shell is more like the shape of I nets ur a lytteltonensis Smith, from 
which Hedlev easily distinguishes the Xeozelanic shell." (Iredale). 
Hedlev replaced the name obliqua with rosea Hedlev, for the 
Australian shell, though rosea was described from New Zealand. 
South Australian shells differ from the New Zealand in the slight¬ 
ly larger and more elevate spire, the typical size being 1.3 x 1.35 
mm. 
Schizotrochus Monterosato 1877. Minute, globosely conic, 
much like Scissurella but the slit fascicle is on the lower, instead 
of being on the upper part of the whorls. Operculum very thin. 
Type— Scissurella crispata Fleming 1832 (Europe). The young 
have no slit. A world-wide group of fcfat few species; only one 
species being usually present in a faunal area, and that species 
having generally a wide range (Finlay). Pilsbry gives localities 
of crispata , the type of the genus, as Spitzbergen to Sicily and 
Azores, Greenland to New England, 4-790 fathoms: Culebra, 
West Indies; Pliocene of Italy and Rhodes. It is questionable 
whether Schizotrochus should be regarded as a genus or subgen us. 
S. australis Hedley 1905. (Scissurella) . PI. 1, fig. 10. “The 
Southern Schizotrochus.'' Large, thin, trochiform, spire gradu¬ 
ate, base tumid, narrowly umbilicate; white; last whorl above with 
about sixty-four curved oblique lamellate riblets; on spire the 
ribbing is finer, closer, and crossed by fine spiral threads which 
appear on the lower whorl in broken lengths; base with about 
twenty-five coarse, widely spaced radii, most prominent around 
the umbilicus, which they enter; on outer basal circumference are 
interstitial radii, crossed by half a dozen spiral threads; fascicle 
enfolded by broad margins. Height 2.5, diam. 3 mm. Dredged 
—Cape Jaffa, Beachport, Cape Wiles, 100-300 fathoms. (Type 
