J5.A. NAt., VOL. XV. 
\’ov. : 0 th. 1933. By Brmnrd C. Cott&n atftd / K Godfrey 
■21 
S. ornata May 1908. PI. 1, fig. 8. “The Ornate. Scissnr- 
c'la.” Minute, obliquely discoida!, strongly ribbed and spiral¬ 
led; canal, a deep furrow, bordered by sharp, raised edges, the 
whole raised on a distinct ridge which surrounds the shell about 
midway between the suture and the periphery; on lower side is 
a smooth depressed area; yellowish-white; ribs, strong, sharp, 
begin below the furrow and continue round the whorl to enter 
the small but deep umbilicus; above the furrow, raised curved 
ribs roughly correspond to those below and continue uninterrupt¬ 
ed from the central ridge to the suture; the spaces between these 
ribs are cancellated by six to eight spiral keels, much smaller 
than the ribs, and not passing over them; these spirals continue 
between the lower ribs, passing over the upper part of them, there 
giving them a crested appearance; protoconch of one-and-a-half 
! turns, is squared by a beaded ridge, and is sunken below the level 
I of the two rounded adult whorls, which are somewhat angled by 
the canal; mouth defined by a continuous narrow margin; slit 
open, deep, moderately wide. Height 1, diam. 1.5 mm. Cape 
Borda also Venus Bay, 4 specimens. (Type locality—Frederick 
Henry Bay, Tasmania, in kelp roots). .It has a superficial re¬ 
semblance to Schismope beddomei Petterd, but the ribs are more 
numerous and continuous, and with strong spirals, and it is a 
larger shell, and a true Scissurella. Scissurella coronata Watson, 
seems a near ally. The four South Australian specimens are 
not typical. They are larger, spirals stronger and radials weaker. 
They may prove to be x distinct species. 
Scissurona Iredale 1924. Minute, ear-shaped, spire elevated, 
spiral sculpture; protoconch axially ribbed; adult whorls few, first 
rounded, later spreading and flattened above; slit well above the 
periphery, deep, edged with low keels; mouth large, oval; colu¬ 
mella c,,:uuve, broad, extending over the steep, narrow, umbilicus. 
Type— Scissurella rosea Hedley 1904 (New Zealand). Scissurona 
has a deceitful resemblance to Incisura Hedley (family Fissurelli- 
dae ), but like all its relations in Scissurellidae, has the slit fasciole 
edged on either side by an upturned rim, which character is in¬ 
compatible with Incisura. I redale states that there is no close 
relationship between Scissurona remota Iredale (which he has 
listed as a subspecies of S. rosea Hedley, his type of Scissurona) 
and a true Scissurella. 
S. remota Iredale 1924. PL 1, fig. 9. (Scissurona rosea 
remota Iredale 1924: = Scissurella obliqua Pritchard & Gatliff, 
not Watson: = S. rosea Hedley, for Tasmania, not Hedley tor 
New Zealand). Ear-shaped, translucent, slightly umbilicate; 
