20 . 
South Australian Shells. 
S.A. NAT., VOL. XV. 
Nov. 30th, 1933. 
or whitish: surface covered with close spiral cords and threads 
which are somewhat granose; numerous folds radiate from the 
suture, but not long enough to reach the periphery; whorls about 
three, rounded, convex above; last whorl with a blunt keel at 
the row of holes, and a narrowed, more acute keel a short dis¬ 
tance below it, the space between being a little concave; holes 
about five, open, oval, their edges only a trifle raised; columellar 
plate flat, not truncate below, strongly sloping inward; inside 
silvery with red and green reflections, muscle impression not dis¬ 
tinct. Length 68, width 56, height 26 mm. Rather common, 
from low' water to 15 fathoms, on rocks and Pinnae (razor-fish). 
Gulf St. Vincent, Kangaroo Island, Spencer Gulf and westward to 
Streaky Bay and Murat Bay. Verco did not take it at St. Fran¬ 
cis Island. Not recorded from W estern Australia. Recorded 
from Port Phillip, Victoria, but not from Tasmania. It would 
seem to be very localised and confined to the southern coast of 
Australia. (Type locality—Kangaroo Island, South Australia). 
The elevated spiral tendency is stronger in. this species than In 
other Haliotis. Individuals vary much in height, some have quite 
an elate spire. 
SCISSURELLIDAE. 
Minute, unicoloured, umbilicate, top-shaped or depressed, 
tew-w horled, thin, inside pearl}': spire small: body whorl large, 
mouth oval: outer lip with a slit, and with a differently sculp¬ 
tured band or anal fascicle encircling the whorls. Operculum cir¬ 
cular, horny, thin, many-whorled, nucleus central. Distribution 
-World-wide ,mostly in rather deep water. Fossil—Tertiary, 
about as many species as the Recent. Animal with a rather long 
rostrum, long’ciliated tentacles bearing eyes at their outer bases; 
foot rather narrow; epipodium bearing four ciliated cirri on each 
side. The foramen or slit in the shell corresponds with the end 
of the rectum, and serves for the expulsion of waste matter as 
in the case of the perforations of Haliotis and the tubes of 1 ypnis. 
Scissurella d’Ofbignv 1824. Diminutive of scissus, a slit. 
Minute, depressed, not pearly, thin, with an open anal slit extenp- 
ing backward from the peristome; slit fasciole extending near} 
tc the apex and edged on either side by an upturned riny, sen p 
ture spiral: spire small: body whorl large; mouth rounded. Uper- 
culum ovate, very thin, with an obscure subspiral nucleus. Young 
shells have no slit. Type—S. coslata d’Orbigny. 
