50. 
S..V XAT., VOL. XV. 
march 27th, 1934. 
South Australian Shclli 
common; I ruin A facDonncll Bay to Fremantle, beach* and dredg¬ 
ed to 35 fathoms. (Type locality—Southern 'Tasmania | Ireclale] )- 
1 Ins species is very variable. Flindcrsinn specimens are usually 
thicker, shorter, and wider than tile tvpe, but a large series shows 
that they merge into the typical form. The ribs mav be all of 
the same size or there may be about fourteen radial ribs which 
stand higher than the rest, with about seven small ones between* 
The larger ribs mar be double or may become devaricatc. They 
ere of a lighter colour than the rest of the shell which is black¬ 
ish or rustv brown. For some distance around the perforation 
the shell may be white, bordered bv an almost black scalloped 
edge which fades off to the usual colour of the shell. There may 
be a pinkish encircling band on the dorsum just within the mar¬ 
gin. A juvenile is ol a greenish tint with four double blackish 
radial bands at. the four angles of the shell. 
Animal active; loot and mantle rose, papillae, on foot and 
mantle white, coronal processes white, sole vellow, snout bfown r 
tent aces and ana! tube orange, a lew papillae along the shell 
black; loot, more than twice the length of the shell, bearin'; 
numerous papillae of various sizes; tentacles subeylindrieai, tips 
blunt, half as long as the sheik with conspieuut$ eyes on outer 
bases; snout half the length of tentacles, slightly tapering, oral 
onhee longitudinal; anal tube sometimes exserted, surrounded 
by cushion-like \ xpiliae; mantle roughened and denticulated on 
both margins by numerous small papillae; outer margin free all 
round, capable ol sheltering the retracted head and falling cur¬ 
tain-wise from the shell's periphery to the foot; inner margin not 
overlaying the shell, produced into sixteen erect, branched, wav¬ 
ing processes which surround the shell like a crown; viewed from 
above these coronal processes give the whole animal the general 
aspect of a sea anemone. 
S. oblonga Menke 1843 {Fissurclla) (— LitcapincUa prU - 
chardi Lied ley 18 ( o). Shell oblong, twice as long as broad, par¬ 
allel sides, ends rather abruptly rounded, slightly pinched or 
either side of the perforation, posterior end suddenly and highly, 
the anterior gradually and 
somewhat arched; neffor 
ghtlv elevated; middle edge of she!: 
n narrowly oval, a quarter of the 
r, hed s length, iis anterior end the shell’s centre; pink, obscureh 
rayed by hall a dozen yellow segments; interior white, smooth. 
p< rce’kmous, except at short edge where it is pink and crenulateff 
by the external tablets; note!) cut deepest at hinder end; riblets. 
radiating, unequal, about ninety, broader than interstices, beaded 
wicrc cut across by circumferential growth lines, near the margin 
■ *‘i s scultpure develops into imbricating scales upon the riblets; 
posteriorly the edge bordered within by a heavy callus, which 
