\. NAT-, VOI.. XIV. 
1932 . 
/jv />’. Oh. I A.'. Codfr ry. _z'. 
prospective yield of 4,000 specimens, but an Echinus could barely 
accomodate half a dozen mature shells, so we wonder what be- 
:o;nes of the rest. The spawn-masses are oval, each enveloped 
in a gelatinous case. The fry occupy nautiloid shells of a single 
whorl, into which (unlike the adult) they are capable of entirely 
withdrawing. „ xt r 
Stilifer Broderij. 1832. ‘TJrchm Snails. ^ Name refers to 
the 5 tyle-iikc protoconcli, (dobular or tapering, thin, glas5> , 
rclluctd, polished, smooth; protoconch very sharp, sinistral, ob- 
lique; adult whorls, numerous, dc.Ktral; mouth suboval angiuated 
above, rounded below; outer lip slightly sinuous ,thin, simple; 
inner lip smooth, arcuated, no operculum. Type— S. turtom Pro- 
derip' 1832, on sea-urchins in British seas. 
S. brazieri Angas 1877 (Stylifer). PI. 1, fie. 23. “Brazier’s 
Urchin Snail.” Subglobose. iMiru-hed; oellucid white; smooth, spire 
elevated; protoconcli st\hfonn; adult wliorls live, rounded, flat- 
tened just’below the sutures, which are very finely callously mar- 
ginatc; mouth subovate. pointed above, rounded below; outer lip 
thin; sinqfle; coUnnella arcuate, vevy slightly thickened above, the 
margins joined by a thin, distinct callus. Height 4, diam. 2 mm. 
Gulf St. Vincent.' Rare. (Type locality— Port Jackson. Found 
on a species of starfish). 
S. brunneuft Tate 1887. “Tlic Dark-brown Urchin Snail. 
Subglobose; dark-brown, shining, black-brown around the suture; 
axial lines, crowded, faint, oblique; spiral lines^ distant; spire 
short, acuminately produced; protoconch cylindrical, styliform; 
adult wliorls about four, convex, of moderate increase, slightly 
depressed vat the suture above; last whorl large, faintly angulated 
at the base and depressed at the suture, and in consequence 
having a perceptibly subquadratc outline; suture linear; outer 
lip thin, regularly curved, acutely angled posteriorly; columella 
thin, slightly elevated, defined by a superficial groove behind. 
Height 5, diam. 3.5 mm. Port Wiliiinga. Apparently very rare 
in South Australia: our sp.ecimens are smaller and more delicate 
than typical ones; probably juveniles, lype locality — ^Parasitic on 
Siron^yhce7itro.nis |Sea ur.hin], invariably on the periproct, in 
eight trt ten fathoms, Capel Sound. Port Phillip). Animal with a 
large expanded disc-like mantle. 
S. Mderae Petterd 1884 (Stylifer) {= S. crotaphis Wat- 
son S8S6). “LoddeUs Urchin Snail.” Elongately pyramidal, thin, 
shining; milky-white; spiral lines, faint; whorls twelve, moder- 
ately rounded, marginate at suture, last whorl subobtusc at peri- 
phery; mouth pyriform; outer Hp thin, acute. Height 16, diam. 
6 mm. Gulf St. Vincent, Spencer Gulf; rare. (Type locality — 
